ORGANIC LIGHT EMITTING DEVICE

An organic light emitting device is provided. The organic light emitting device includes an organic light emitting panel, a drive unit receiving image data and image luminance discrimination signal that includes information on a maximum luminance of the image and providing a data voltage corresponding to the image luminance discrimination signal to the organic light emitting panel, and a power supply unit providing a common voltage to the organic light emitting panel. The common voltage is varied to correspond to the image luminance discrimination signal. 1. An organic light emitting device , comprising:an organic light emitting panel displaying an image;a drive unit receiving image data corresponding to the image and providing a data voltage corresponding to the image data to the organic light emitting panel; anda power supply unit providing a common voltage to the organic light emitting panel,with the common voltage being varied to correspond to a maximum luminance of the image.2. The organic light emitting device of claim 1 , wherein if the common voltage is varied to correspond to the maximum luminance of the image claim 1 , the data voltage is varied to correspond to the maximum luminance of the image claim 1 , andif grayscales of the image are constant, a difference between the common voltage and the data voltage becomes constant.3. The organic light emitting device of claim 1 , wherein if the maximum luminance of the image is changed from a first luminance to a second luminance that is higher than the first luminance claim 1 , the common voltage is changed from a first voltage that corresponds to the first luminance to a second voltage that corresponds to the second luminance.4. The organic light emitting device of claim 3 , wherein a time in which the common voltage is changed from the first voltage to the second voltage is longer than a time in which the maximum luminance is changed from the first luminance to the second luminance.5. The organic light ...

DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY INCLUDING THE SAME

There are disclosed a DC-DC converter and an organic light emitting display including the same. The DC-DC converter includes a first voltage generator that has an inductor and a plurality of transistors, and converts an input voltage into a first voltage and outputs the first voltage to a first output terminal. The DC-DC converter also includes a controller that controls driving of the first voltage generator by supplying a first driving pulse to each transistor of the first voltage generator. In the DC-DC converter, the amplitude of the first driving pulse is adjustable. Accordingly, it is possible to provide a DC-DC converter and an organic light emitting display including the same, which can achieve high power conversion efficiency by change a driving pulse used in a DC-DC converter. 1. A DC-DC converter , comprising:a first voltage generator comprising a first inductor and a first plurality of transistors, the first voltage generator configured to convert an input voltage into a first voltage and to output the first voltage to a first output terminal; anda controller configured to control driving of the first voltage generator by supplying a first driving pulse to each transistor of the first voltage generator;wherein the amplitude of the first driving pulse is adjustable based on current output from the first voltage generator.2. The DC-DC converter according to claim 1 , wherein the first voltage generator comprises:a first inductor coupled between a first node and an input terminal to which the input voltage is applied;a first transistor coupled between the first node and ground; anda second transistor coupled between the first node and the first output terminal.3. The DC-DC converter according to claim 1 , wherein the controller is further configured to change the amplitude of the first driving pulse claim 1 , based on the input voltage.4. The DC-DC converter according to claim 2 , wherein the first driving pulse is supplied to each of the gate electrodes of ...

Digital-analog converter, data driving circuit having the same, and display device having the same

A digital-analog converter of the disclosure converts digital image data to generate analog data signals. The digital-analog converter includes a voltage divider which generates a plurality of gamma reference voltages based on a first reference voltage and a second reference voltage; a global ramp including a plurality of gamma decoders which generates a plurality of global gamma voltages based on the gamma reference voltages; a decoder which selects one of the global gamma voltages according to the digital image data to generate the analog data signals; and a ramp controller which turns off at least some of the gamma decoders based on the digital image data.

Display device performing a sensing operation

A display device includes: a display panel including a plurality of pixels; a scan driver connected to the plurality of pixels through a plurality of scan lines; a data driver connected to the plurality of pixels through a plurality of data lines; an emission driver connected to the plurality of pixels through a plurality of emission control lines; a sensing circuit connected to the plurality of pixels through a plurality of sensing lines; and a controller configured to control the scan driver, the data driver, the emission driver and the sensing circuit, wherein, in an active period of each frame period, the scan driver sequentially applies a sensing pulse and a scan pulse to at least one scan line of the plurality of scan lines, and applies the scan pulse to remaining scan lines of the plurality of scan lines.

Data driver and display device including the same

A data driver includes: a signal generator which includes a staircase waveform gray voltage signal generator which generate a plurality of staircase waveform gray voltage signals using a lowest gamma reference voltage, a highest gamma reference voltage, and a plurality of gamma voltages having a magnitude between the lowest gamma reference voltage and the highest gamma reference voltage; and a channel driver which includes a decoder which output one staircase waveform gray voltage signal selected from the staircase waveform gray voltage signals, an output circuit which output a gray voltage corresponding to the selected staircase waveform gray voltage signal, and a reset unit which supplies one of the gamma voltages to the output circuit as a reset voltage.

ORGANIC LIGHT-EMITTING DISPLAY

An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor. 1. A light-emitting display comprising:a display panel comprising a first pixel;a first data line electrically connected to the first pixel;a data driver electrically connected to the first data line; a first light-emitting diode;', 'a sensing transistor comprising a first electrode electrically connected to the first data line and a second electrode electrically connected to the first light-emitting diode of the first pixel,', 'a first driving transistor comprising a first electrode electrically connected to a first power supply terminal and a second electrode electrically connected to the first light-emitting diode; and', 'a first switch transistor comprising a first electrode electrically connected to the first data line and a second electrode electrically connected to a gate electrode of the first driving transistor,, 'wherein the first pixel compriseswherein the data driver is configured to apply a data signal to the gate electrode of the first driving transistor through the first data line during a display period, andwherein the data driver is configured to apply a reference voltage to the first light-emitting diode through the sensing transistor during a sensing period.2. The light-emitting display of the claim 1 , wherein the data driver is configured to measure an electric current flowing ...

PIXEL, DISPLAY DEVICE, AND METHOD OF DRIVING DISPLAY DEVICE

A pixel according to some embodiments includes a light source unit, a first transistor coupled between a first power source and a first node, and configured to control a driving current applied to the light source unit, a first bias transistor coupled between a first bias power source and a gate electrode of the first transistor, and a second bias transistor coupled between a second bias power source and a second node that is electrically coupled to an anode of the light source unit, wherein the first bias transistor and the second bias transistor are configured to be turned on during a first period before a data voltage is applied among one frame, and wherein the second bias transistor is configured to be turned on at least once during a second period after the data voltage is applied among the one frame. 1. A pixel comprising:a light source unit;a first transistor coupled between a first power source and a first node, and configured to control a driving current applied to the light source unit;a first bias transistor coupled between a first bias power source and a gate electrode of the first transistor; anda second bias transistor coupled between a second bias power source and a second node that is electrically coupled to an anode of the light source unit,wherein the first bias transistor and the second bias transistor are configured to be turned on during a first period before a data voltage is applied among one frame, andwherein the second bias transistor is configured to be turned on at least once during a second period after the data voltage is applied among the one frame.2. The pixel of claim 1 , wherein a voltage of the first bias power source has a level that is lower than that of the second bias power source.3. The pixel of claim 1 , further comprising a third bias transistor coupled between the first node and the second node.4. The pixel of claim 3 , wherein the third bias transistor is configured to be turned off in the second period among the one frame. ...

Noise removing circuit and current sensing unit including the same

A noise-removing circuit includes a first capacitor to charge a first voltage supplied to a first node during a first period in which a first switching control signal is supplied, a second capacitor to charge a second voltage supplied to a third node during the first period, a third capacitor to charge the first voltage during a second period in which a second switching control signal is supplied, and to charge the second voltage charged in the second capacitor as a third voltage during a third period in which a third switching control signal is supplied, a fourth capacitor to charge the second voltage during the second period, and to charge the first voltage charged in the first capacitor as a fourth voltage during the third period, and a differential amplifier to output a voltage difference between the third voltage and the fourth voltage.

CURRENT MEMORY CELL AND A CURRENT MODE DIGITAL-TO-ANALOG CONVERTER INCLUDING THE SAME

A current memory cell includes an amplifier, transistor, first and second capacitors, and first to third switching units. The amplifier includes first to third terminals. The transistor is coupled to first and second nodes, and ground. The first capacitor is coupled between the second node and ground. The second capacitor is coupled between a third node and ground. The first unit couples a current source to the first node during a first period and an output line to the first node during a second period. The second unit couples the first node to the second node during the first period. The third unit couples the first terminal to the second node and couples the second and third terminals to the third node during the first period, and couples the first terminal to the third node and couples the second and third terminals to the second node during the second period. 1. A current memory cell , comprising:an amplifier including a first input terminal, a second input terminal and an output terminal;a transistor including a source electrode coupled to a first node, a drain electrode coupled to a ground, and a gate electrode coupled to a second node;a first capacitor coupled between the second node and the ground;a second capacitor coupled between a third node and the ground;a first switching unit configured to couple a reference current source to the first node during a first period and couple an output line to the first node during a second period;a second switching unit configured to couple the first node to the second node during the first period; anda third switching unit configured to couple the first input terminal of the amplifier to the second node and couple the second input terminal of the amplifier and the output terminal of the amplifier to the third node during the first period, and couple the first input terminal of the amplifier to the third node and couple the second input terminal of the amplifier and the output terminal of the amplifier to the second node ...

Display device performing a sensing operation

A display device includes: a display panel including a plurality of pixels; a scan driver connected to the plurality of pixels through a plurality of scan lines; a data driver connected to the plurality of pixels through a plurality of data lines; an emission driver connected to the plurality of pixels through a plurality of emission control lines; a sensing circuit connected to the plurality of pixels through a plurality of sensing lines; and a controller configured to control the scan driver, the data driver, the emission driver and the sensing circuit, wherein, in an active period of each frame period, the scan driver sequentially applies a sensing pulse and a scan pulse to at least one scan line of the plurality of scan lines, and applies the scan pulse to remaining scan lines of the plurality of scan lines.

DISPLAY DEVICE AND DRIVING METHOD THEROF

A display device including pixels; a leakage current compensator connected to at least one of data lines connected to the pixels; and an integrator connected to the leakage current compensator. The leakage current compensator is configured to store a voltage that corresponds to a leakage current that flows to the at least one data line, and to flow the leakage current to ground from the at least one data line according to a voltage that corresponds to the leakage current. The integrator is configured to receive a pixel current generated by subtracting the leakage current from a measurement current that flows to the at least one data line, and to output a difference value between a pixel voltage that corresponds to the pixel current and a reference voltage. 1. A display device comprising:pixels;data lines connected to the pixels;a leakage current compensator connected to one of the data lines, the leakage current compensator configured to store a voltage that corresponds to a leakage current that flows to the one data line, and to transmit the leakage current to ground from the at least one data line, according to a voltage that corresponds to the leakage current; andan integrator connected to the leakage current compensator, the integrator configured to receive a pixel current generated by subtracting the leakage current from a measurement current that is transmitted to the at least one data line, and to output a difference value between a pixel voltage that corresponds to the pixel current and a reference voltage.2. The display device of claim 1 , wherein the leakage current compensator comprises a leakage current compensation circuit claim 1 , the leakage current compensation circuit comprising: a first electrode connected to a first node and the data line;', 'a gate electrode connected to a second node; and', 'a second electrode connected to a high level voltage;, 'a first transistor comprising a first input terminal connected to the first node; and', 'a second ...

AMOLED DISPLAY DEVICE AND DRIVING METHOD THEREOF

A display device is disclosed. In one aspect, the display device includes a plurality of pixels, a plurality of data lines respectively connected to the pixels, and a compensation unit connected to at least one the data lines. The compensation unit includes a first capacitor storing a leakage current of a pixel connected to the data line, a second capacitor storing a difference current, where the difference current is the difference between a reference current and a pixel current measured when a data signal of a reference gray signal is applied to the pixel. The compensation unit also includes a comparator outputting a difference value between the voltages stored in the first and second capacitors. According to embodiments, is possible to measure an accurate pixel current regardless of a leakage current and accurately detect deterioration of a pixel. 1. An organic light-emitting diode (OLED) display device , comprising:a plurality of pixels;a plurality of data lines respectively connected to the pixels; anda compensation unit connected to at least one of the data lines, a first capacitor configured to store a leakage current of a pixel connected to a corresponding data line;', 'a second capacitor configured to store a difference current, wherein the difference current is defined as the difference between a reference current and a current measured when a reference gray signal is applied to the pixel; and', 'a comparator configured to output a voltage difference, wherein the voltage difference value is defined as the difference between the voltages stored in the first and second capacitors., 'wherein the compensation unit includes2. The display device of claim 1 , wherein the compensation unit further includes:a first transistor including a gate electrode connected to a first node, a first electrode connected to a high level voltage, and a second electrode connected to a second node;a second transistor including a gate electrode connected to the first node, a first ...

ERROR COMPENSATOR AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME

An error compensator and an organic light emitting display device using the same. The organic light emitting display device includes pixels each having a driving transistor and an organic light emitting diode; and a sensing unit extracting at least one of a first information including the threshold voltage of the driving transistor or a second information including the degradation of the organic light emitting diode from a pixel of the pixels. In the organic light emitting display device, the sensing unit includes an amplifier amplifying a voltage corresponding to the at least one of the first information or the second information; and an error compensator compensating for error components of elements included in the amplifier and the error compensator. 1. An organic light emitting display device , comprising:a plurality of pixels each having a driving transistor and an organic light emitting diode; anda sensing unit for extracting at least one of a first information including a threshold voltage of the driving transistor or a second information including a degradation of the organic light emitting diode from a pixel of the pixels,wherein the sensing unit includes:an amplifier for amplifying a voltage corresponding to the at least one of the first information or the second information; andan error compensator for compensating for error components of elements included in the amplifier and the error compensator.2. The organic light emitting display device of claim 1 , wherein the error components include offset characteristics claim 1 , noises and line resistances of the elements.3. The organic light emitting display device of claim 1 , wherein the amplifier includes:an eleventh transistor comprising a second electrode coupled to the pixel, a first electrode coupled to a ground power source, and a gate electrode coupled to the second electrode so that current flows from the pixel to the ground power source;a twelfth transistor coupled in the form of a current mirror ...

PIXEL ARRAY AND ORGANIC LIGHT EMITTING DISPLAY DEVICE INCLUDING THE SAME

A pixel array and an organic light emitting display device including the same, can display an image with uniform luminance by compensating for a variation in threshold voltage/mobility of a driving transistor for each pixel and compensating for a change in efficiency due to degradation of an organic light emitting diode. A first pixel among the pixel array includes an organic light emitting diode; a pixel circuit positioned among an anode electrode of the organic light emitting diode, a first scan line and a first data line through which a data signal is supplied to the first pixel, and controlling current flowing in the organic light emitting diode; and a switching element controlling the coupling between a second data line through which a data signal is supplied to a second pixel of the plurality of pixels and the anode electrode of the organic light emitting diode. 1. A pixel array , comprising:a plurality of pixels,with a first pixel among the plurality of pixels comprising:an organic light emitting diode;a pixel circuit positioned among an anode electrode of the organic light emitting diode, a first scan line and a first data line through which a first data signal is supplied to the first pixel, the pixel circuit controlling current flowing in the organic light emitting diode; anda switching element controlling the coupling between a second data line through which a second data signal is supplied to a second pixel of the plurality of pixels and the anode electrode of the organic light emitting diode, in response to a control signal supplied through a control line.2. The pixel array of claim 1 , wherein the pixel circuit includes:a first transistor coupled between a first power source and the anode electrode of the organic light emitting diode, and having a gate electrode coupled to a first node;a second transistor coupled between the first data line and the first node, and having a gate electrode coupled to the first scan line; anda storage capacitor coupled ...

DISPLAY DEVICE AND DRIVING METHOD THEREOF

A display device includes pixels connected to data lines and scan lines, a first compensator which is connected to sensing lines and senses deviation information of the sensing lines while supplying different voltages to adjacent sensing lines, and a sensing unit which is connected to the first compensator and senses characteristic information of each of the pixels. 1. A display device , comprising:pixels connected to data lines and scan lines;a first compensator which is connected to sensing lines and senses deviation information of the sensing lines while supplying different voltages to adjacent sensing lines of the sensing lines; anda sensing unit which is connected to the first compensator and senses characteristic information of each of the pixels.2. The display device of claim 1 , wherein the first compensator supplies a first voltage to a first capacitor provided in a predetermined sensing line of the adjacent sensing lines and supplies a second voltage different from the first voltage to a second capacitor provided in an adjacent sensing line of the adjacent sensing lines.3. The display device of claim 2 , wherein the sensing unit generates first channel data in a digital form by a voltage stored in the first capacitor and generates second channel data in a digital form by a voltage stored in the second capacitor.4. The display device of claim 3 , wherein the sensing unit generates charge data in a digital form by a charge share voltage generated by charge-sharing the first capacitor and the second capacitor.5. The display device of claim 4 , further comprising a timing controller which obtains a ratio of the first capacitor to the second capacitor by the first channel data claim 4 , the second channel data claim 4 , and the charge data claim 4 ,wherein the ratio of the first capacitor to the second capacitor is the deviation information.6. The display device of claim 1 , wherein the first compensator includes a multiplexer connected to the sensing lines and ...

NON-LINEAR GAMMA COMPENSATION CURRENT MODE DIGITAL-ANALOG CONVERTOR AND DISPLAY DEVICE INCLUDING THE SAME

A non-linear gamma compensation current mode digital-analog converter includes: a first digital-analog converter block configured to: receive a digital signal, a first reference voltage, and a gamma adjustment voltage, and provide a reference current to a ground, wherein a first current flowing to a first current output terminal is determined according to the digital signal and the gamma adjustment voltage; and a second digital-analog converter block configured to: receive the digital signal, a second reference voltage, and a ground voltage, and provide the first current to the first digital-analog converter, wherein a second current flowing to a second current output terminal is determined according to the digital signal and the first current. 1. A non-linear gamma compensation current mode digital-analog converter comprising: receive a digital signal, a first reference voltage, and a gamma adjustment voltage; and', 'provide a reference current to a ground, wherein a first current flowing to a first current output terminal is determined according to the digital signal and the gamma adjustment voltage; and, 'a first digital-analog converter block configured to receive the digital signal, a second reference voltage, and a ground voltage; and', 'provide the first current to the first digital-analog converter, wherein a second current flowing to a second current output terminal is determined according to the digital signal and the first current., 'a second digital-analog converter block configured to2. The non-linear gamma compensation current mode digital-analog converter of claim 1 , wherein a plurality of first switches coupled to the first current output terminal;', 'a plurality of second switches coupled to a power source voltage; and', the plurality of first switches and the plurality of second switches; and', 'a reference current terminal configured to receive the reference current., 'a plurality of bit current transistors comprising a gate electrode coupled to ...

DISPLAY DEVICE AND METHOD OF DRIVING DISPLAY DEVICE

A display device includes data lines, scan lines, and pixels. Each of the pixels includes an organic light emitting diode, a first transistor (OLED), and a second transistor. The first transistor is electrically connected to an anode of the OLED. The second transistor is electrically connected to the first transistor, a scan line among the scan lines, and a data line among the data lines. The second transistors of the pixels may receive instances of a reference voltage from the data lines during a first period of a frame. The second transistors of the pixels may simultaneously receive instances of a turn-on scan signal from the scan lines during the first period of the frame. Cathodes of the OLEDs of the pixels may receive instances of a turn-off voltage for the OLEDs to turn off during the first period of the frame. 1. A display device comprising:a plurality of data lines;a plurality of scan lines electrically insulated from the plurality of data lines; anda plurality of pixel circuits, each of the pixel circuits comprising an organic light emitting diode, a first transistor, and a second transistor,wherein the first transistor is electrically connected to an anode electrode of the organic light emitting diode,wherein the second transistor is electrically connected to the first transistor, a scan line among the scan lines, and a data line among the data lines,wherein the second transistors of the pixel circuits are configured to respectively receive instances of a reference voltage from the plurality of data lines during a first period of a frame,wherein the second transistors of the pixel circuits are configured to respectively and simultaneously receive instances of a turn-on scan signal from the plurality of scan lines and turn on during the first period of the frame, andwherein cathode electrodes of the organic light emitting diodes of the pixel circuits are configured to respectively receive instances of a turn-off voltage for the organic light emitting diodes ...

Display device and driving method thereof

A display device according to an embodiment of the present invention includes: a pixel configured to emit light according to a data signal supplied to a data line, a power source voltage supplier configured to supply a power source voltage to the pixel, a driving transistor configured to drive the pixel to be emitted according to the data signal and the power source voltage, and a sensor configured to supply a test signal to a data line and to detect a sensing current flowing to the data line through the driving transistor according to the test signal.

ORGANIC LIGHT EMITTING DISPLAY DEVICE AND DRIVING METHOD THEREOF

An organic light emitting display device includes pixels positioned at crossing regions between data lines and scan lines, each of the pixels including an organic light emitting diode, a scan driver configured to supply a scan signal to scan lines, a data driver configured to drive the data lines, wherein the data driver includes, in each channel, a supply part comprising a digital-to-analog converter configured to generate data signals using second data supplied from outside in a driving period, and a deterioration part configured to measure deterioration information of the organic light emitting diode using the digital-to-analog converter in a sensing period. 1. An organic light emitting display device comprising:pixels positioned at crossing regions between data lines and scan lines, each of the pixels comprising an organic light emitting diode;a scan driver configured to supply a scan signal to scan lines;a data driver configured to drive the data lines;wherein the data driver comprises, in each channel,a supply part comprising a digital-to-analog converter configured to generate data signals using second data supplied from outside in a driving period; and a deterioration part configured to measure deterioration information of the organic light emitting diode using the digital-to-analog converter in a sensing period.2. The organic light emitting display device according to claim 1 ,wherein the supply part comprises:a holding latch configured to store deterioration data from the deterioration part or the second data;a digital-to-analog converter configured to generate an analog voltage corresponding to either the deterioration data or a data signal corresponding to the second data; anda buffer configured to output the analog voltage or the data signal.3. The organic light emitting display device according to claim 2 ,wherein the deterioration data is supplied in the sensing period.4. The organic light emitting display device according to claim 2 ,wherein the ...

ORGANIC LIGHT EMITTING DISPLAY AND DRIVING METHOD THEREOF

An organic light emitting display includes a plurality of pixels and a compensation unit. Each of the pixels includes a driving transistor to control an amount of current supplied to a corresponding organic light emitting diode. The compensation unit is coupled to the pixels by data lines and includes at least one sensing unit. The sensing unit extracts threshold voltage information from the pixels corresponding to respective driving transistors. The sensing unit receives noise currents from a plurality of data lines, offset the noise currents, and extracts the threshold voltage information after offset of the noise currents. 1. An organic light emitting display , comprising:a plurality of pixels, each including a driving transistor to control an amount of current supplied to a corresponding organic light emitting diode; anda compensation unit coupled to the pixels by data lines, the compensation unit including at least one sensing unit to extract threshold voltage information from the pixels corresponding to respective driving transistors, wherein the at least one sensing unit is to receive noise currents from a plurality of data lines, offset the noise currents, and extract the threshold voltage information after offset of the noise currents.2. The display as claimed in claim 1 , wherein the at least one sensing unit is coupled to:a first data line which is coupled to a first pixel in which the threshold voltage information of the driving transistor is to be extracted, anda second data line which is coupled to a second pixel at a same horizontal line as the first pixel.3. The display as claimed in claim 2 , wherein:the first pixel stores a data signal corresponding to a predetermined current, andthe second pixel stores a black data signal.4. The display as claimed in claim 2 , wherein the at least one sensing unit includes:first and second capacitors having second terminals electrically coupled to each other;a reference voltage generation unit to generate a ...

DISPLAY DEVICE AND DRIVING METHOD THEREOF

A display device includes: a plurality of pixels, each being coupled to a corresponding data line among a plurality of data lines and a corresponding scan line among a plurality of scan lines; a scan driver to supply a scan signal to the scan lines; a sensor coupled to the pixels and the data lines and configured to detect a sensing current according to a test signal input to the data lines; and a controller configured to detect a pixel current of a pixel corresponding to a scan line to which the scan signal is supplied, by using a first sensing current corresponding to a first pixel and a second sensing current corresponding to a second pixel, when the scan signal is selectively supplied to a first scan line coupled to the first pixel and a second scan line coupled to the second pixel. 1. A display device comprising:a plurality of pixels, each of the plurality of pixels being coupled to a corresponding data line among a plurality of data lines and a corresponding scan line among a plurality of scan lines;a scan driver to supply a scan signal to the plurality of scan lines;a sensor coupled to the plurality of pixels and the plurality of data lines and configured to detect a sensing current according to a test signal input to the plurality of data lines; anda controller configured to detect a pixel current of a pixel from among the plurality of pixels corresponding to a scan line from among the plurality of scan lines to which the scan signal is supplied, by using a first sensing current corresponding to a first pixel from among the plurality of pixels and a second sensing current corresponding to a second pixel from among the plurality of pixels which are detected by the sensor, when the scan signal is selectively supplied to a first scan line from among the plurality of scan lines coupled to the first pixel and a second scan line from among the plurality of scan lines coupled to the second pixel.2. The display device of claim 1 , wherein:the pixel current is ...

ORGANIC LIGHT-EMITTING DISPLAY DEVICE AND METHOD OF DRIVING THE SAME

An organic light-emitting display device includes: pixels; and a data driver including a plurality of current measurers connected to the pixels via at least one data line, each of the current measurers including: a first measurement circuit including: a first operational amplifier including a non-inverted input terminal to which a first reference voltage is applied, and an inverted input terminal connected to a first pixel from among the pixels; and a first feedback capacitor connected between the inverted input terminal and an output terminal of the first operational amplifier; and a second measurement circuit including: a second operational amplifier including a non-inverted input terminal to which a second reference voltage is applied, and an inverted input terminal connected to a second pixel from among the pixels; and a second feedback capacitor connected between the inverted input terminal and an output terminal of the second operational amplifier. 1. An organic light-emitting display device , comprising:a plurality of pixels, each of the pixels comprising an organic light-emitting diode (OLED); anda data driver comprising a plurality of current measurers connected to the plurality of pixels via at least one data line, each of the current measurers comprising:a first measurement circuit comprising:a first operational amplifier comprising a non-inverted input terminal to which a first reference voltage is applied, and an inverted input terminal connected to a first pixel from among the plurality of pixels; anda first feedback capacitor connected between the inverted input terminal and an output terminal of the first operational amplifier; anda second measurement circuit comprising:a second operational amplifier comprising a non-inverted input terminal to which a second reference voltage having a different level from that of the first reference voltage is applied, and an inverted input terminal connected to a second pixel from among the plurality of pixels; anda ...

ORGANIC LIGHT-EMITTING DISPLAY

An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor. 1. An organic light-emitting display comprising:a display panel comprising first and second pixels, each having an organic light-emitting diode; anda data driver comprising a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel,wherein the first pixel comprises a sensing transistor which has a first electrode coupled to the data driver and a second electrode coupled to the organic light-emitting diode of the first pixel, a first driving transistor which has a first electrode coupled to a first power supply terminal and a second electrode coupled to the second electrode of the sensing transistor, and a first switch transistor which has a first electrode coupled to the data driver and a second electrode coupled to a gate electrode of the first driving transistor, andwherein the second pixel comprises a second driving transistor which has a first electrode coupled to the first power supply terminal and a second electrode coupled to the organic light-emitting diode of the second pixel, and a second switch transistor which has a first electrode ...

PIXEL ARRAY AND ORGANIC LIGHT EMITTING DISPLAY DEVICE INCLUDING THE SAME

A pixel array and an organic light emitting display device including the same, can display an image with uniform luminance by compensating for a variation in threshold voltage/mobility of a driving transistor for each pixel and compensating for a change in efficiency due to degradation of an organic light emitting diode. A first pixel among the pixel array includes an organic light emitting diode; a pixel circuit positioned among an anode electrode of the organic light emitting diode, a first scan line and a first data line through which a data signal is supplied to the first pixel, and controlling current flowing in the organic light emitting diode; and a switching element controlling the coupling between a second data line through which a data signal is supplied to a second pixel of the plurality of pixels and the anode electrode of the organic light emitting diode. 112-. (canceled)13. A display panel , comprising:a plurality of scan lines,a plurality of data lines, anda plurality of pixels, an organic light emitting diode coupled between a first electrode and a second electrode,', 'a pixel circuit,', 'a first switch configured to couple a first data line of the plurality of data lines to the pixel circuit in response to a first control signal supplied through a first scan line of the plurality of scan lines, and', 'a second switch configured to couple a second data line of the plurality of data lines to the first electrode in response to a second control signal supplied through a second scan line of the plurality of scan lines., 'wherein at least one of the plurality of pixels comprises14. A method of driving a display panel , comprising:extracting characteristic information of a driving transistor included in a first pixel coupled to a first data line and a second data line while sinking current through the second data line from the driving transistor;extracting degradation information of an organic light emitting diode included in the first pixel while ...

ORGANIC LIGHT-EMITTING DISPLAY AND METHOD OF DRIVING THE SAME

An organic light-emitting display devices includes a display panel having first and second pixel groups, each group including first, second, and third pixels which emit light of different colors and a current measurement unit having a plurality of current measurement channels connected to the first and second pixel groups by data lines, wherein each of the current measurement channels includes a first measurement circuit connected to one of the first, second, and third pixels in the first pixel group and measures current characteristics of the connected one of the pixels and a second measurement circuit which measures current characteristics of one of the first, second, and third pixels, in the second pixel group, which emits light of the same color as that of light emitted from the one of the pixels connected to the first measurement circuit. 1. An organic light-emitting display comprising: 'first, second, and third pixels configured to emit light of different colors; and', 'first and second pixel groups, each group comprising, 'a display panel comprising a plurality of current measurement channels connected to the first and second pixel groups by data lines,', a first measurement circuit connected to one of the first, second, and third pixels in the first pixel group and configured to measure current characteristics of the connected one of the pixels; and', 'a second measurement circuit configured to measure current characteristics of one of the first, second, and third pixels, in the second pixel group, which is configured to emit light of the same color as that of light emitted from the one of the pixels connected to the first measurement circuit., 'wherein each of the current measurement channels comprises], 'a current measurement unit comprising2. The organic light-emitting display of claim 1 , 'a first integrator circuit,', 'wherein the first measurement circuit comprises 'a second integrator circuit,', 'wherein the second measurement circuit comprises [ a ...

DISPLAY DEVICE AND METHOD FOR COMPENSATION OF IMAGE DATA OF THE SAME

A display device includes: a display including a plurality of pixels; and a controller configured to: receive an external input image signal, adjust the external input image signal to compensate for brightness deviations of the pixels, and transmit corresponding image data signals to the pixels, wherein the controller includes: a data input section configured to receive the external input image signal and transmit a test image data signal to the pixels through a data driver, a luminance information extracting section configured to: extract brightness information for the pixels after displaying a test image in accordance with the test image data signal, and calculate first, second, and third parameters, using the brightness information, and a data compensating section configured to generate the image data signals by adjusting the external input image signal based on the first, second, and third parameters.

GATE DRIVER FOR DISPLAY DEVICE AND DISPLAY DEVICE INCLUDING THE SAME

A gate driver for a display device and a display device including the same are disclosed. In one aspect, the gate driver includes first through N-th scan drivers configured to respectively output first through N-th scan signals, where N is an integer greater than 1. The gate driver also includes first through N-th sensing drivers configured to respectively output first through N-th sensing signals, wherein an M-th one of the first through N-th sensing drivers is configured to activate an M-th one of the first through N-th sensing signals K times during an active period of an (M+1)-th one of the first through N-th scan signals, where M is an integer greater than 0 and less than N and K is an integer greater than 1. 1. A gate driver for a display device , the gate driver comprising:first through N-th scan drivers configured to respectively output first through N-th scan signals, where N is an integer greater than 1; andfirst through N-th sensing drivers configured to respectively output first through N-th sensing signals,wherein an M-th one of the first through N-th sensing drivers is configured to activate an M-th one of the first through N-th sensing signals K times during an active period of an (M+1)-th one of the first through N-th scan signals, where M is an integer greater than 0 and less than N and K is an integer greater than 1.2. The gate driver of claim 1 , wherein the gate driver is embedded in a display panel of the display device.3. The gate driver of claim 1 , wherein the M-th sensing driver comprises:a first transistor configured to output a sensing clock signal as the M-th sensing signal during an active period of an (M+1)-th carry signal based on the (M+1)-th carry signal output from an (M+1)-th one of the first through N-th scan drivers; anda second transistor configured to output a power supply voltage as the M-th sensing signal during an active period of an (M+2)-th carry signal based on the (M+2)-th carry signal output from an (M+2)-th one of the ...

DATA DRIVER AND DISPLAY DEVICE INCLUDING A DATA DRIVER

A data driver includes a gamma voltage generator configured to generate gamma voltages based on a number of data bits of a pixel data; a first digital-to-analog block configured to generate a plurality of time-division gamma voltage signals respectively corresponding to a plurality of gamma voltage groups; a plurality of time-division gamma voltage line groups for transferring the plurality of time-division gamma voltage signals; a second digital-to-analog block configured to select a time-division gamma voltage signal among the time-division gamma voltage signals according to upper bits of the pixel data in each channel; a time-division gamma voltage select block configured to select a gamma voltage according to lower bits of the pixel data in each channel; and an output buffer block configured to output the selected gamma voltage in each channel. 1. A data driver outputting a plurality of data voltages to a plurality of pixels through a plurality of channels , the data driver comprising:{'sup': 'N', 'a gamma voltage generator configured to generate 2gamma voltages, where N is an integer greater than one corresponding to a number of data bits of each pixel data among a plurality of pixel data received by the data driver;'}{'sup': N', 'N-M', 'N-M', 'M', 'N', 'N-M', 'N-M', 'N-M', 'M, 'a first digital-to-analog block configured to group the 2gamma voltages into 2gamma voltage groups such that each gamma voltage group of the 2gamma voltage groups includes 2gamma voltages among the 2gamma voltages, where M is an integer greater than zero and less than N, and to generate 2time-division gamma voltage signals respectively corresponding to the 2gamma voltage groups, each time-division gamma voltage signal of the 2time-division gamma voltage signals representing the 2gamma voltages by dividing one horizontal time;'}{'sup': N-M', 'N-M', 'N-M, '2time-division gamma voltage line groups for transferring the 2time-division gamma voltage signals, each time-division gamma voltage ...

Display device and method of driving the same

A method of driving a pixel including: during a first period of a first frame, applying a first scan signal having a turn-on level to the first scan line, applying a data voltage to a data line, and applying a second scan signal having the turn-on level to the second scan line; and during a second period of a second frame, applying the first scan signal having the turn-on level to the first scan line, applying a bias voltage to the data line, and applying the second scan signal having a turn-off level to the second scan line, the second frame is a frame subsequent to the first frame, the second period is longer than the first period, and a light-emitting diode emits light at luminance based on the data voltage during at least a portion of the first frame and at least a portion of the second frame.

DISPLAY DEVICE AND DRIVING METHOD THEREOF

A display device includes pixels at respective crossing regions of scan lines and data lines, a scan driver that is configured to supply a scan signal to the scan lines, and a data driver that is configured to supply a pre-emphasis voltage to the data lines using a first constant for controlling a voltage value of the pre-emphasis voltage, and using a second constant for controlling a supply time of the pre-emphasis voltage, and supply data signals to the data lines after the supply of the pre-emphasis voltage, wherein at least one of the first or second constants is stored in each channel corresponding to each of the data lines. 1. A display device comprising:pixels at respective crossing regions of scan lines and data lines;a scan driver that is configured to supply a scan signal to the scan lines; and supply a pre-emphasis voltage to the data lines using a first constant for controlling a voltage value of the pre-emphasis voltage, and using a second constant for controlling a supply time of the pre-emphasis voltage; and', 'supply data signals to the data lines after the supply of the pre-emphasis voltage,, 'a data driver that is configured towherein at least one of the first or second constants is stored in each channel corresponding to each of the data lines.2. The display device of claim 1 , wherein an i-th (i is a natural number) channel of the data driver comprises:a digital-to-analog converter for generating the data signals;a first register for storing the first constant;a pre-emphasis voltage generator for generating the pre-emphasis voltage using the first constant;a first switch for controlling a connection between the pre-emphasis voltage generator and an i-th data line of the data lines;a comparator for comparing a voltage of the i-th data line and voltages of the data signals; anda controller for controlling a value of the first constant based on a comparison result of the comparator.3. The display device of claim 2 , wherein the i-th channel of the ...

DATA DRIVER AND ORGANIC LIGHT EMITTING DISPLAY DEVICE HAVING THE SAME

A data driver includes a data signal converter to convert image data to a data signal, an output buffer to output the data signal to a data line, a first cascode circuit connected to the output buffer and including a plurality of transistors, a first noise attenuator connected to a first node between the output buffer and the first cascode circuit, and to attenuate a first current noise, a second cascode circuit connected to the output buffer and including a plurality of transistors, a second noise attenuator connected a second node between the output buffer and the second cascode circuit, and to attenuate a second current noise, a current integrator to generate an integrated voltage by integrating a first current flowing through the first cascode circuit and a second current flowing through the second cascade circuit, and an analog-digital converter (ADC) to convert the integrated voltage to a digital signal. 1. A data driver comprising:a data signal converter configured to convert image data to a data signal;an output buffer configured to output the data signal to a data line;a first cascode circuit connected to the output buffer and comprising a plurality of transistors connected in series;a first noise attenuator connected to a first node between the output buffer and the first cascode circuit, and configured to attenuate a first current noise;a second cascode circuit connected to the output buffer and comprising a plurality of transistors connected in series;a second noise attenuator connected a second node between the output buffer and the second cascode circuit, and configured to attenuate a second current noise;a current integrator configured to generate an integrated voltage by integrating a first current flowing through the first cascode circuit and a second current flowing through the second cascode circuit; andan analog-digital converter (ADC) configured to convert the integrated voltage to a digital signal.2. The data driver of claim 1 , wherein claim 1 ...

ORGANIC LIGHT-EMITTING DISPLAY

An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor. 1a display panel comprising first and second pixels, each having an organic light-emitting diode; anda data driver comprising a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel,wherein the first pixel comprises a sensing transistor which has a first electrode coupled to the data driver and a second electrode coupled to the organic light-emitting diode of the first pixel, a first driving transistor which has a first electrode coupled to a first power supply terminal and a second electrode coupled to the second electrode of the sensing transistor, and a first switch transistor which has a first electrode coupled to the data driver and a second electrode coupled to a gate electrode of the first driving transistor, andwherein the second pixel comprises a second driving transistor which has a first electrode coupled to the first power supply terminal and a second electrode coupled to the organic light-emitting diode of the second pixel, and a second switch transistor which has a first electrode coupled to the data driver and a second ...

Display device and driving method thereof

A display device according to an embodiment of the present invention includes: a pixel configured to emit light according to a data signal supplied to a data line, a power source voltage supplier configured to supply a power source voltage to the pixel, a driving transistor configured to drive the pixel to be emitted according to the data signal and the power source voltage, and a sensor configured to supply a test signal to a data line and to detect a sensing current flowing to the data line through the driving transistor according to the test signal.

Non-linear gamma compensation current mode digital-analog convertor and display device including the same

A non-linear gamma compensation current mode digital-analog converter includes: a first digital-analog converter block configured to: receive a digital signal, a first reference voltage, and a gamma adjustment voltage, and provide a reference current to a ground, wherein a first current flowing to a first current output terminal is determined according to the digital signal and the gamma adjustment voltage; and a second digital-analog converter block configured to: receive the digital signal, a second reference voltage, and a ground voltage, and provide the first current to the first digital-analog converter, wherein a second current flowing to a second current output terminal is determined according to the digital signal and the first current.

Organic light emitting display device configured to measure deterioration information, and driving method thereof

An organic light emitting display device includes pixels positioned at crossing regions between data lines and scan lines, each of the pixels including an organic light emitting diode, a scan driver configured to supply a scan signal to scan lines, a data driver configured to drive the data lines, wherein the data driver includes, in each channel, a supply part comprising a digital-to-analog converter configured to generate data signals using second data supplied from outside in a driving period, and a deterioration part configured to measure deterioration information of the organic light emitting diode using the digital-to-analog converter in a sensing period.

Error compensator and organic light emitting display device using the same

An error compensator and an organic light emitting display device using the same. The organic light emitting display device includes pixels each having a driving transistor and an organic light emitting diode; and a sensing unit extracting at least one of a first information including the threshold voltage of the driving transistor or a second information including the degradation of the organic light emitting diode from a pixel of the pixels. In the organic light emitting display device, the sensing unit includes an amplifier amplifying a voltage corresponding to the at least one of the first information or the second information; and an error compensator compensating for error components of elements included in the amplifier and the error compensator.

Display device for enhancing a driving speed, and driving method thereof

A display device includes pixels at respective crossing regions of scan lines and data lines, a scan driver that is configured to supply a scan signal to the scan lines, and a data driver that is configured to supply a pre-emphasis voltage to the data lines using a first constant for controlling a voltage value of the pre-emphasis voltage, and using a second constant for controlling a supply time of the pre-emphasis voltage, and supply data signals to the data lines after the supply of the pre-emphasis voltage, wherein at least one of the first or second constants is stored in each channel corresponding to each of the data lines.

Organic light-emitting display having sensing transistor

An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor.

Organic light-emitting display having sensing transistor

An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor.

DC-DC converter and organic light emitting display including the same

There are disclosed a DC-DC converter and an organic light emitting display including the same. The DC-DC converter includes a first voltage generator that has an inductor and a plurality of transistors, and converts an input voltage into a first voltage and outputs the first voltage to a first output terminal. The DC-DC converter also includes a controller that controls driving of the first voltage generator by supplying a first driving pulse to each transistor of the first voltage generator. In the DC-DC converter, the amplitude of the first driving pulse is adjustable. Accordingly, it is possible to provide a DC-DC converter and an organic light emitting display including the same, which can achieve high power conversion efficiency by change a driving pulse used in a DC-DC converter.

Pixel array and organic light emitting display device including the same

A pixel array and an organic light emitting display device including the same, can display an image with uniform luminance by compensating for a variation in threshold voltage/mobility of a driving transistor for each pixel and compensating for a change in efficiency due to degradation of an organic light emitting diode. A first pixel among the pixel array includes an organic light emitting diode; a pixel circuit positioned among an anode electrode of the organic light emitting diode, a first scan line and a first data line through which a data signal is supplied to the first pixel, and controlling current flowing in the organic light emitting diode; and a switching element controlling the coupling between a second data line through which a data signal is supplied to a second pixel of the plurality of pixels and the anode electrode of the organic light emitting diode.

Display device and driving method thereof

A display device includes pixels connected to data lines and scan lines, a first compensator which is connected to sensing lines and senses deviation information of the sensing lines while supplying different voltages to adjacent sensing lines, and a sensing unit which is connected to the first compensator and senses characteristic information of each of the pixels.

Apparatus and method for driving e-paper panel

Disclosed herein are an apparatus and a method for driving an e-paper panel. The e-paper panel driving apparatus includes a power supply module that supplies a DC power, a DC/DC converter that converts voltage of the DC power supply supplied from the power supply module into a preset voltage, a sensing module that senses an output voltage from the DC/DC converter, and a control module that supplies or blocks the output voltage from the DC/DC converter to an e-paper panel according to the output voltage sensed by the sensing module.

Data driver and display device including the same

A data driver includes a multi-channel sample/hold circuit electrically connected between a digital-to-analog converter and a data buffer. The multi-channel sample/hold circuit includes a first sample/hold circuit connected to a first channel and a second sample/hold circuit connected to a second channel. The first sample/hold circuit performs a first drive operation and a second drive operation. The first drive operation includes sampling a data voltage as a buffer input voltage and maintaining the buffer input voltage during an nth horizontal time. The second drive operation includes outputting the buffer input voltage to an output terminal of the buffer during an (n+1)th horizontal time. The second sample/hold circuit performs the second drive operation during the nth horizontal time and performs the first drive operation during the (n+1)th horizontal time.

Digital driving circuit, digital-analog converter having decoders with different turn on/off state, and display device thereof

A digital-analog converter of the disclosure converts digital image data to generate analog data signals. The digital-analog converter includes a voltage divider which generates a plurality of gamma reference voltages based on a first reference voltage and a second reference voltage; a global ramp including a plurality of gamma decoders which generates a plurality of global gamma voltages based on the gamma reference voltages; a decoder which selects one of the global gamma voltages according to the digital image data to generate the analog data signals; and a ramp controller which turns off at least some of the gamma decoders based on the digital image data.

Display device configured to sequentially apply a sensing pulse and a scan pulse

A display device includes: a display panel including a plurality of pixels; a scan driver connected to the plurality of pixels through a plurality of scan lines; a data driver connected to the plurality of pixels through a plurality of data lines; an emission driver connected to the plurality of pixels through a plurality of emission control lines; a sensing circuit connected to the plurality of pixels through a plurality of sensing lines; and a controller configured to control the scan driver, the data driver, the emission driver and the sensing circuit, wherein, in an active period of each frame period, the scan driver sequentially applies a sensing pulse and a scan pulse to at least one scan line of the plurality of scan lines, and applies the scan pulse to remaining scan lines of the plurality of scan lines.

Input sensing unit and method of driving the same

An input sensing unit includes a touch sensing unit, which includes a plurality of driving electrodes, a plurality of sensing electrodes, and a driving signal generating unit which provides driving signals to the driving electrodes. The sensing electrodes are insulated from and intersect the driving electrodes. The driving signal generating, unit includes touch drivers connected to driving electrodes and a digital-to-analog converter configured to provide a first signal or a second signal, and each of the touch drivers is connected to a preset number of driving electrodes among the driving electrodes.

Output buffer, data driver, and display device having the same

An output buffer is disclosed that includes: a buffer circuit that outputs an output signal to an output terminal based on a first input signal provided to a first input terminal and a second input signal provided to a second input terminal; and a current supply circuit that is connected in parallel to the buffer circuit, and provides an auxiliary current to the output terminal based on the first input signal and the second input signal.

Display device performing a sensing operation

Sensor device and a method of driving the same

A sensor device including: first sensors; second sensors configured to form capacitances with the first sensors; a sensor transmitter connected to the first sensors and configured to supply driving signals having a first frequency to the first sensors; and a sensor receiver connected to the second sensors and configured to receive sensing signals from the second sensors, wherein the sensor receiver includes: a multipath filter having a center frequency set to the first frequency; and a first chopper integrator connected to the multipath filter, and having a center frequency set to the first frequency.

Data driver and organic light emitting display device having the same

A data driver includes a data signal converter to convert image data to a data signal, an output buffer to output the data signal to a data line, a first cascode circuit connected to the output buffer and including a plurality of transistors, a first noise attenuator connected to a first node between the output buffer and the first cascode circuit, and to attenuate a first current noise, a second cascode circuit connected to the output buffer and including a plurality of transistors, a second noise attenuator connected a second node between the output buffer and the second cascode circuit, and to attenuate a second current noise, a current integrator to generate an integrated voltage by integrating a first current flowing through the first cascode circuit and a second current flowing through the second cascade circuit, and an analog-digital converter (ADC) to convert the integrated voltage to a digital signal.

Data driver with sample/hold circuit and display device including the same

A data driver includes a multi-channel sample/hold circuit electrically connected between a digital-to-analog converter and a data buffer. The multi-channel sample/hold circuit includes a first sample/hold circuit connected to a first channel and a second sample/hold circuit connected to a second channel. The first sample/hold circuit performs a first drive operation and a second drive operation. The first drive operation includes sampling a data voltage as a buffer input voltage and maintaining the buffer input voltage during an nth horizontal time. The second drive operation includes outputting the buffer input voltage to an output terminal of the buffer during an (n+1)th horizontal time. The second sample/hold circuit performs the second drive operation during the nth horizontal time and performs the first drive operation during the (n+1)th horizontal time.

Data driver and display device including a data driver

A data driver includes a gamma voltage generator configured to generate gamma voltages based on a number of data bits of a pixel data; a first digital-to-analog block configured to generate a plurality of time-division gamma voltage signals respectively corresponding to a plurality of gamma voltage groups; a plurality of time-division gamma voltage line groups for transferring the plurality of time-division gamma voltage signals; a second digital-to-analog block configured to select a time-division gamma voltage signal among the time-division gamma voltage signals according to upper bits of the pixel data in each channel; a time-division gamma voltage select block configured to select a gamma voltage according to lower bits of the pixel data in each channel; and an output buffer block configured to output the selected gamma voltage in each channel.

Input sensing unit and method of driving the same

An input sensing unit includes a touch sensing unit, which includes a plurality of driving electrodes, a plurality of sensing electrodes, and a driving signal generating unit which provides driving signals to the driving electrodes. The sensing electrodes are insulated from and intersect the driving electrodes. The driving signal generating unit includes touch drivers connected to driving electrodes and a digital-to-analog converter configured to provide a first signal or a second signal, and each of the touch drivers is connected to a preset number of driving electrodes among the driving electrodes.

Touch detection device, display device including the same, and method of driving the same

A touch detection device supplies driving signals generated based on orthogonal carriers and a CDMA scheme to driving electrodes. A touch driving circuit drives the driving electrodes in groups including a first group and a second group, supplies first driving signals based on a designated first frequency and first orthogonal codes set to correspond to the driving electrodes of the first group, respectively, to the driving electrodes of the first group, and supplies second multiple driving signals based on a second frequency orthogonal to the first frequency and second orthogonal codes set to correspond to the driving electrodes of the second group, respectively, to the driving electrodes of the second group.

Digital-to-analog converter and driving circuit of display device including the same

A digital-to-analog converter (“DAC”) converts digital image data into analog image signals. The DAC includes a stage outputting different voltages to a first output terminal and a second output terminal based on a voltage supplied to a first input terminal, a voltage supplied to a second input terminal, and a first input bit. The stage includes a switch circuit including switches that are alternately turned on by a control signal, and outputting an intermediate output voltage to a third output terminal based on a first input voltage supplied to the first input terminal and a second input voltage supplied to the second input terminal, and a selector outputting one of the first input voltage and the second input voltage, and the intermediate output voltage.

Sensor device and a method of driving the same

A sensor device including: first sensors; second sensors configured to form capacitances with the first sensors; a sensor transmitter connected to the first sensors and configured to supply driving signals having a first frequency to the first sensors; and a sensor receiver connected to the second sensors and configured to receive sensing signals from the second sensors, wherein the sensor receiver includes: a multipath filter having a center frequency set to the first frequency; and a first chopper integrator connected to the multipath filter, and having a center frequency set to the first frequency.

Display device and method for compensation of image data of the same

A display device includes: a display including a plurality of pixels; and a controller configured to: receive an external input image signal, adjust the external input image signal to compensate for brightness deviations of the pixels, and transmit corresponding image data signals to the pixels, wherein the controller includes: a data input section configured to receive the external input image signal and transmit a test image data signal to the pixels through a data driver, a luminance information extracting section configured to: extract brightness information for the pixels after displaying a test image in accordance with the test image data signal, and calculate first, second, and third parameters, using the brightness information, and a data compensating section configured to generate the image data signals by adjusting the external input image signal based on the first, second, and third parameters.

Organic light-emitting display device and method of driving the same

An organic light-emitting display device includes: pixels; and a data driver including a plurality of current measurers connected to the pixels via at least one data line, each of the current measurers including: a first measurement circuit including: a first operational amplifier including a non-inverted input terminal to which a first reference voltage is applied, and an inverted input terminal connected to a first pixel from among the pixels; and a first feedback capacitor connected between the inverted input terminal and an output terminal of the first operational amplifier; and a second measurement circuit including: a second operational amplifier including a non-inverted input terminal to which a second reference voltage is applied, and an inverted input terminal connected to a second pixel from among the pixels; and a second feedback capacitor connected between the inverted input terminal and an output terminal of the second operational amplifier.

AMOLED display device including compensaton unit and driving method thereof

A display device is disclosed. In one aspect, the display device includes a plurality of pixels, a plurality of data lines respectively connected to the pixels, and a compensation unit connected to at least one the data lines. The compensation unit includes a first capacitor storing a leakage current of a pixel connected to the data line, a second capacitor storing a difference current, where the difference current is the difference between a reference current and a pixel current measured when a data signal of a reference gray signal is applied to the pixel. The compensation unit also includes a comparator outputting a difference value between the voltages stored in the first and second capacitors. According to embodiments, is possible to measure an accurate pixel current regardless of a leakage current and accurately detect deterioration of a pixel.

Organic light emitting display and driving method thereof

An organic light emitting display includes a plurality of pixels and a compensation unit. Each of the pixels includes a driving transistor to control an amount of current supplied to a corresponding organic light emitting diode. The compensation unit is coupled to the pixels by data lines and includes at least one sensing unit. The sensing unit extracts threshold voltage information from the pixels corresponding to respective driving transistors. The sensing unit receives noise currents from a plurality of data lines, offset the noise currents, and extracts the threshold voltage information after offset of the noise currents.

Gate driver for display device and display device including the same

A gate driver for a display device and a display device including the same are disclosed. In one aspect, the gate driver includes first through N-th scan drivers configured to respectively output first through N-th scan signals, where N is an integer greater than 1. The gate driver also includes first through N-th sensing drivers configured to respectively output first through N-th sensing signals, wherein an M-th one of the first through N-th sensing drivers is configured to activate an M-th one of the first through N-th sensing signals K times during an active period of an (M+1)-th one of the first through N-th scan signals, where M is an integer greater than 0 and less than N and K is an integer greater than 1.

Display device and driving method thereof

A display device includes: a plurality of pixels, each being coupled to a corresponding data line among a plurality of data lines and a corresponding scan line among a plurality of scan lines; a scan driver to supply a scan signal to the scan lines; a sensor coupled to the pixels and the data lines and configured to detect a sensing current according to a test signal input to the data lines; and a controller configured to detect a pixel current of a pixel corresponding to a scan line to which the scan signal is supplied, by using a first sensing current corresponding to a first pixel and a second sensing current corresponding to a second pixel, when the scan signal is selectively supplied to a first scan line coupled to the first pixel and a second scan line coupled to the second pixel.

Noise removing circuit and current sensing unit including the same

A noise-removing circuit includes a first capacitor to charge a first voltage supplied to a first node during a first period in which a first switching control signal is supplied, a second capacitor to charge a second voltage supplied to a third node during the first period, a third capacitor to charge the first voltage during a second period in which a second switching control signal is supplied, and to charge the second voltage charged in the second capacitor as a third voltage during a third period in which a third switching control signal is supplied, a fourth capacitor to charge the second voltage during the second period, and to charge the first voltage charged in the first capacitor as a fourth voltage during the third period, and a differential amplifier to output a voltage difference between the third voltage and the fourth voltage.

Pixel array and organic light emitting display device including the same

A pixel array and an organic light emitting display device including the same, can display an image with uniform luminance by compensating for a variation in threshold voltage/mobility of a driving transistor for each pixel and compensating for a change in efficiency due to degradation of an organic light emitting diode. A first pixel among the pixel array includes an organic light emitting diode; a pixel circuit positioned among an anode electrode of the organic light emitting diode, a first scan line and a first data line through which a data signal is supplied to the first pixel, and controlling current flowing in the organic light emitting diode; and a switching element controlling the coupling between a second data line through which a data signal is supplied to a second pixel of the plurality of pixels and the anode electrode of the organic light emitting diode.