THERMOCHROMIC DISPLAY DEVICE USING ACOUSTOTHERMAL HEATING

Hereinafter, with reference to the drawing of the present invention in the embodiment for the present invention in the preface is provided to the person with skill in the art to detailed embodiment is hereinafter for 2000. However the present invention refers to several different taught herein can be embodied in the form of a in the embodiment is not limited to. In the present invention is described that is independent portion drawing unambiguously account for dispensed when the, same or similar component are identical in area to specification reference code is configured to receive.

Figure 1 shows a perspective view according to one embodiment of the invention relates to a method and therefore [...] display device, the display device according to one embodiment of the invention is separating [...] perspective view as shown in Figure 2, Figure 3 shows a side view of the schematic diagram of Figure 2 [...] display device through acoustic thermal heating are disclosed.

With reference to the SFC also 1 to 3 also, the [...] display device in the embodiment according to (1) become thermally communicates heat heating device part (2) on said heating device part (2) visual information based on a change in color of pigment [...] reversibly bodies and a stand (3) consists of including.

Wherein, heating device part (2) the display unit (3) are each reversible dealkylation, consisting of separate structure can be said. , the [...] display device in the embodiment of (1) a heating device part (2) the display unit (3) are separated off and the display driving only upon can be reversibly by use of a one heating device part (2) visual information as to visual information only defined as can be.

On the other hand, heating device part (2) is installed to the acoustic thermal heating manner to generate surface acoustic wave (SAW: Surface Acustic Wave) arranged cross shaped IDT (Interdigital Transducer) electrode (20) is formed a piezoelectric substrate (10), said IDT electrode (20) is formed on said piezoelectric substrate (10) and bodies on said piezoelectric substrate (10) is composed of a material viscoelastic heat and surface acoustic waves generated by a heating body (30) and said heated body (30) number to heating under [e (Interdigital Transducer) IDT electrode (20) generator generating the signal current scene (40) consists of including.

Wherein, piezoelectric substrate (10) comprised of a mechanical energy into an electric energy to the piezoelectric, an alternating current of a predetermined frequency to generate the electric field applied to generate surface acoustic waves through the IDT (Interdigital Tansducer) electrode (20) through the [...] number to be the predetermined pattern shape.

In the embodiment in a piezoelectric substrate (10) is 500 μm thickness propagation lithium niobate 128° y-a x cutting x - (Lithium Niobate; LiNbO₃ ) Consisting of piezoelectric (Piezoelectric) substrate (10) consisting of a metal layer (Au/Cr, 1000/300 Å) on IDT electrode (20) are electron beam effusion lift-off (E-a beam Evaporation Lift Off) by depositing small number per se is exemplified substrate.

However, in the present invention piezoelectric substrate (10) is said lithium [...] (LiNbO₃ ) Which are not limited to consist of essentially circular, IDT electrode (20) through a predetermined frequency to generate the electric field applied to generate surface acoustic waves that are alternating current through, quartz (Quartz), lithium tantalate (LiTaO₃ ), Lithium borate (Li₂ B₄ O₇ ) Or La3Ga5SiO14 (La₃ Ga₅ SiO₁₄ ) More including a wide variety of piezoelectric material can be made more convenience for the operation disclosed.

Figure 4 shows a plane view of Figure 1 shown in a piezoelectric substrate (Interdigital Transducer) deposited over the IDT electrode shape are disclosed.

With reference to the SFC also 4, said IDT electrode (20) essentially relates to a piezoelectric substrate (10) to another one of the rear side of each number 1 formed electrode terminal (21) and number 2 electrode terminal (25) extending in the lateral direction towards each other along a direction of the layers being formed from these plurality of number 1 finger electrode (22) and number 2 finger electrode (26) is sandwiched between each other overlapping end-to-end of the fork were between 2 to cantilevered or non staggered such as pattern shape lying deposited to have formed.

I.e., IDT electrode (20) of a plurality of number 1 finger electrode (22) and number 2 finger electrode (26) has a reticle are paired λ / 4 of constant width, each transmission line interval is identical to λ / 4 are formed on the base.

As well as, IDT electrode (20) to generate surface acoustic waves in order to signal generator (40) having an alternating signal is applied to the resonant frequency to resonate through which the, resonant frequency is fAC=cs / λ if that interval, wherein, the piezo cs sonic of substrate materials are disclosed.

The, piezoelectric substrate (10) IDT electrode through an electric field to form a signal generator (20) corresponding to the number 1 of heat when an alternating current is applied to finger electrode (22) and number 2 finger electrode (26) + specific, - positioned a piezoelectric substrate (10) is equal to cause a surface acoustic wave (SAW) (reference 3 also).

Wherein, resonant frequency is applied to IDT electrode (20) when the frequency of the surface acoustic wave in the acoustic wave has a frequency of the AC signal-vibration (fSAW) on (fAC) are the same.

In the embodiment the in the IDT electrode (20) number 1 of finger electrode (22) and number 2 finger electrode (26) forms the contact metal chromium (Cr) gold (Au) bottom upper the contact each other laminated structure formed in a layered manner Cr/Au is formed so as to least one each other.

However, the IDT electrode (20) are Ti/Au or Ti/Al Cr/Au laminated structure as well as the height of the aforementioned combination can be made negative, aluminum (Al), platinum (Pt), gold (Au), rhodium (Rh), iridium (Ir), copper (Cu), titanium (Ti), tungsten (W), chromium (Cr), nickel (Ni) including both metal compound can be selected from among the one or more electrode material more convenience for the operation disclosed.

On the other hand, said IDT electrode (20) is said piezoelectric substrate (10) arranged on at least one heating zone can be formed to have a predetermined shape, the heating of heat in the embodiment 1 in row 3 (f1, f2, f3) associating with formed is exemplified substrate. Wherein, each heating said associating different said IDT (f1, f2, f3) comprises at least one electrode (20) embodied in the shape of cross-arranged through.

In the IDT electrode in the embodiment (20) number 1 of finger electrode (22) and number 2 finger electrode (26) are disposed parallel to each other arranged parallel cross has a reverse, each heating zone (f1, f2, f3) number 1 for each finger electrode (22) and number 2 finger electrode (26) 33.6 (or spacing) the width of a different reticle pattern is is exemplified substrate.

However, the present invention herein are not necessarily limited to has the IDT electrode (20) of constructing an array of depending on the shapes of various heating zone can number 1 as well as finger electrode (22) and number 2 finger electrode (26) are arranged as parallel carry addition to picking up the aforementioned cross shape inclined cross array (12 and 13 may also reference) modify such as can be formed more convenience for the operation disclosed.

On the other hand, each heating zone (f1, f2, f3) are in said IDT electrode (20) within the frequency range generated by a surface acoustic wave to 200MHz 5MHz preferably consists.

I.e., IDT electrode (20) within the frequency range generated by a surface acoustic wave to 200MHz 5MHz relayed number therefore, less than the frequency of the IDT electrode when 5MHz surface acoustic wave (20) does not when the surface acoustic wave, when less than cost and lowering the efficiency of IDT electrode size greater than 200MHz 5um number tank's oldest a drawback.

1 to 3 also with reference to the SFC also again, a heated body (30) includes said IDT electrode (20) is formed on said piezoelectric substrate (10) to elevated on bodies, said piezoelectric substrate (10) generated on surface acoustic wave (SAW) consisting of viscoelastic materials that absorb through the heat.

In the embodiment in a heated body (30) made of a silicon based polymer-based PDMS (Polydimethylsiloxane) (Silicone provided Based Polymer) low voltage is exemplified substrate.

However, in the present invention said heated body (30) is PDMS (Polydimethylsiloxane) which are not necessarily limited to silicon-based polymers such as PDMS (Polydimethylsiloxane) (Silicone provided based polymers) are polymeric compounds in addition (Plastics), rubber (Rubber), paper (Paper), food (food; Organic Polymer) or biological tissue (Biological tissue) by incorporating a wide variety of viscoelastic materials may be applied to both more convenience for the operation disclosed.

On the other hand, the least said polymeric compounds (Plastic) mainly PMMA (Polymethyl Methacrylate), PP (polypropylene) or PETE (Polyethylene Terephthalate) can be received from the.

And, signal generator (40) includes associating (f1, f2, f3) number to each heating said space-time division way under [e consists of heating current to produce a signal.

Signal generator (40) storing a current signal corresponding to a predetermined frequency through the IDT electrode (20) of number 1 and number 2 finger electrode (22, 26) in the form of inter-distance therebetween having selectively surface acoustic wave (SAW) is equal to cause corresponding heating zone (f1 - f3).

Said generated surface acoustic wave piezoelectric substrates (10) along the surface of direction is wave (Longitudinal Wave) shape body (30) and to increase bent into a heated body (30) in generates heat and is to be coated.

Figure 5 shows a of Figure 1 through the AC signal represents a time division multiplexed signal generator are disclosed.

As also shown in the 5, signal generator (40) having a MATLAB CODE is, MATLAB CODE through said IDT electrode (20) heating said associating predetermined in time division multiplexed (f1, f2, f3) AC signal through either sequentially or simultaneously heating produces a signal current to a heated body (30) is equal to or higher space-time site heating within the number [...] more freely.

1 to 3 also with reference to the SFC also again, display unit (3) comprises heating said device part (2) and detachably bodies reversibly printed visual information display printing sheet (50) on, said display printing sheet (50) formed by feeling it comes the wall chromatic pigment applied on feeling comes the wall chromatic pigment coating layer (60) consists of including.

In the embodiment the display print sheet (50) is visual information is printed substrate to tack strip using the label paper (#21301 - 100, 3M) is one surface, feeling it comes the change of color pigment coating layer (60) which differ by [...] pigment applied to label [...] film adhere to integrally formed is exemplified substrate.

However the present invention herein are not necessarily limited to display said has the print sheet (50) is paper, polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE) or ethylene vinyl acetate (EVA) including, printed visual information desired to show more easily can be made of various cutting both sheets can be applied more convenience for the operation disclosed.

The, display printing sheet (50) on said associating each heating (f1, f2, f3) enable time of a those can be printed each time.

In addition, a feeling it comes the change of color pigment said coating layer (60) visual information is printed directly on a display printed sheet can be formed by applying [...] pigment (TC).

And, feeling it comes the change of color pigment coating layer (60) for said film is polyethylene terephthalate (PET) formed [...] including various collision film can be made more convenience for the operation disclosed.

On the other hand, in the embodiment the temperature to a temperature higher than a temperature of 72 hereinafter [...] pigment black discoloration in multivalent transparent when heated so that the pigment color use is exemplified substrate.

In addition, said display printing sheet (50) the question is more efficient for heating said heat transfer label the device part (2) heating body (30) on reversible are removed, they are pressure bonded to layer (not shown) of the type of a possible formation of is exemplified substrate.

However, said display printing sheet (50) on said heated body (30) for enhancing heat transfer efficiency between the aforementioned addition to picking up the adhesion layer as contact medium can be water or ultrasound gel such as applying more convenience for the operation disclosed.

Figure 6 shows a 1 row 3 disposed in an IDT electrode (Interdigital Transducer) time division multiplexed heat applied AC signal indicating an operational status of the temperature distribution and reference [...][...] display device, Figure 7 shows a display device for display unit also of Figure 6 represents a pigment applied [...][...] transparency according to temperature and, Figure 8 of Figure 7 [...] pigment white paper is applied to a substrate and heating 5 seconds, 20 seconds cooling heat period when applied on display unit that exhibits a color change graph of Figure 1 and are disclosed.

6 to 8 with reference to the SFC may also, IDT (Interdigital Transducer) electrode (20) to generate a signal to an alternating current having a resonance frequency surface acoustic wave (Surface acoustic wave; SAW) piezoelectric substrate (10) product is reversibly on surface heating body (30) in the form of bent into wave (Longitudinal wave; LW) s7. (reference 3 also).

The, viscoelastic materials consisting of a heated body (30) of acoustic energy is absorbed by viscoelastic damping due to the wave form of thermal energy converting acoustic thermal heating phenomenon to be coated.

In the embodiment in a heated body (30) PDMS polymer is used as an energy-efficient acoustic thermal heating in order to 45MHz range having a frequency of an alternating current signal as the aforementioned 20MHz IDT (Interdigital Transducer) electrode (20) applies.

Wherein, piezoelectric substrate (10) of sonic (approximately 4,000 m/s) and PDMS polymer (approximately 1,100 m/s) [su neel refractive angle of about 20:80 rule according to sonic sound waves (1,100/4,000) sin-a 1 Has 16°, the IDT electrode directly over the entire (Interdigital Transducer) locally heating advantageous in that two electrodes.

On the other hand, IDT electrode (20) number 1 of finger electrode (22) and number 2 finger electrode (26) forms a downward projection for width is determined resonant frequency by a gap, said alternating current having a resonate at frequencies corresponding to the resonance frequency surface acoustic wave CLK3 only when signal is asserted. These properties based on signal generator (40) having a frequency of the AC signal (also 5) via plurality of time division multiplexed (f1, f2, f3) (Interdigital Transducer) associating each heating of IDT electrodes can be selectively application generating surface acoustic waves. The AC signal are several hundred microseconds time-division multiplexing of amine (τ) AC signal having a frequency different price comprised short time meaning that the other.

For example, heat in the form of different resonant frequencies f1, f2 1 row 3, f3 (Interdigital Transducer) IDT electrode arrangement having the heating zone (also 6b) having a frequency of an alternating signal is time interval τ=100 μs to f1 f3 on intersecting to application on a time division multiplexing the AC signal (also 6a) corresponding to the IDT electrode (Interdigital Transducer) f1 f3 CLK3 only the surface acoustic wave resonator. As a result arranged around the IDT [...] (Interdigital Transducer) heating device part (2) which reversibly on display unit (3) for selectively heating the pigment causes [...] differing angles of incident light (also 6b) to be coated. When the camera is on brightness result 6c also are disclosed.

In the embodiment 40 °C [...] used in the pigment has a color change in the temperature in temperature resulting in transparent to opaque black color temperature hereinafter multivalent discoloration (also 7). The pigment due to thermal history [...] feminine hygiene pad temperature about 5 °C feminine hygiene pad the steam heating cooling temperature lower disclosed.

The previously mentioned in the embodiment 2000 K/s or more rapid thermal heating scheme is straight pipe speed such as sound is highly advantageous heating body (30) has a polymer PDMS sheet heat capacity since the natural cooling by convection are quick disclosed.

5 seconds 20 seconds through acoustic thermal heating and cooling by natural convection of heat period length of the display device in fig. 8 fixes [...] consisting of such as slant faces into color display unit won (3) big temperature and color in the display.

Hereinafter, in the embodiment of the present invention display [...] drawing objects from other device through a browser is the reference, number 1 in the embodiment described above the same and similar configuration using an references are identical in local description dispensed to each other.

Figure 9 shows a number 2 in the embodiment according to row 3 [...] display device 1 is disposed in an IDT electrode AC signal time-division multiplexing (Interdigital Transducer) heat is selectively display section display device driven by the shutter type [...] using various colors indicating that the display of Figure 1 reference also are disclosed.

As also shown in the 9, the display device in the embodiment of [...] (1) is, number 1 in the embodiment in comparison with the aforementioned, IDT (Interdigital Transducer) 3 arranged in row 1 in the form of electrode unit including a heating device (also 9a) (2) water level or number without desired area through operation of the logic circuit to selectively heat and a second display unit (3) to selectively deliver only in amount of visual information display device wherein a shutter type [...] controlled by various visual information in applications to other embodiment.

The, display unit (3) display printing sheet (50) after printing a desired color, black in color temperature hereinafter 72 fast [...] pigment is applied to transparent when heated by multivalent discoloration a temperature above the predetermined color information display shutter type display device in accordance with the implementation of [...] (9b also).

Thus, discoloration of a plurality of different temperatures to each temperature discoloration temperature before and after the color pigment can be used to display 72 [...] within substrate without printing a desired color display color information is equal to or higher.

For example, a temperature of 40 °C hereinafter blue, orange color at a temperature of 60 °C hereinafter 40 °C or more, 60 °C or more at a temperature of 72 using the AC signal using time division multiplexed [...] pigment yellow 1 row 3 IDT (Interdigital Transducer) acoustic thermal heating device heat around the center portion (2) 50 is simultaneously can display various colors (9c also).

In this way, shutter type driven [...] display device (1) in comparison with other display device is easy to operate the system can display visual information to the first and second simple complex, various types through a visual information display device for shutter type [...] hereinafter through complex shape can be output. .

Figure 10 shows a confusion matrix row 2 of the present invention number 3 in the embodiment according to 2 also in the form of heat transfer information display device to indicate the operational status of reference [...] are disclosed.

10 also with reference to the described, the feeling it comes wall color display device in the embodiment of (1) is, number 1 in the embodiment in comparison with the aforementioned, in the form of row 2 column 2 (Interdigital Transducer) IDT electrode (also 10a) diagnostic test for analyzing a confusion matrix (Confusion Matrix) artificial neural 2 row 2 heat matrix are specially configured to visually display is exemplified other (10b also).

In this way, the feeling it comes wall color display device in the embodiment of (1) is 2 2 each elements are heat matrix position sheep-row (row 1 1 heat), returned character-(1 row 2 heat), [...] (row 1 2 heat), (row 2 heat) [...] means other. Each elements are easily in the case of picture display provides a visual indication of positive '+' symbols for thumb-like, in the case of voice '-' symbols to display when the position sheep-abstract when thumb-like color, when red position voice, returned character-[...] indicates a confusion matrix (Confusion Matrix) black when each element of visually indicating to other.

Thus, the display device in the embodiment of [...] (1) conventional segmented [...] display device capable of delivering only with respective predetermined visual information that while, in the form of English alphabet or numbers can convey information that indicates to the user applications involving embodiment, device number 2 heating device number or operation of the logic circuit portion in which the magnets without dimensional space-time control section, display unit (3) can be implemented in any 2 dimensional temperature distribution by an selectively deliver only in accordance with the visual information.

Figure 11 shows a display device of the present invention number 4 in the embodiment according to 3 also form into heat transfer information to indicate the operational status of row 3 [...] reference are disclosed.

11 also with reference to the described, the display device in the embodiment of [...] (1) is, in comparison with the aforementioned number 1 in the embodiment, in the form of 3 arranged in row 3 (Interdigital Transducer) IDT electrode including a heating device (also 10a) part (2) has a configuration including a difference.

, the [...] display device in the embodiment of (1) 3 3 segmented [...] display device includes a row of heat so as to be a '1 - 2 - 3' (also 11b) such as number as well as' A provided B provided C ' visual information such as in the form of English alphabet (also 11c) transmission of a disclosed.

In addition, the display device in the embodiment of [...] (1) conventional shutter type [...] display device capable of delivering only with respective predetermined visual information that while, in the form of English alphabet or numbers can convey information that indicates to the user applications involving embodiment, device number 2 heating device number or operation of the logic circuit portion in which the magnets without dimensional space-time control section, display unit (3) can be implemented in any 2 dimensional temperature distribution by an selectively deliver only in accordance with the visual information.

Figure 12 shows a semiconductor device having [...] chromatic grade according of the present invention number 5 in the embodiment also inclined SIDT (Slanted Finger Interdigital Transducer) to indicate the operational status of the display reference [...], Figure 13 illustrates the electrode array structure in a plane 12 according to SIDT (Slanted Finger Interdigital Transducer) also are disclosed.

Also 12 and 13 also with reference to the described, the display device in the embodiment of [...] (1) is, number 1 in the embodiment in comparison with the aforementioned, heating device part (2) of IDT electrode (10) along the longitudinal direction is formed obliquely SIDT (Slanted Finger Interdigital Transducer) electrode (also 11a) has a configuration in the form of difference.

In this way, SIDT electrode (20) number 1 to at least two finger electrode (22) and number 2 finger electrode (26) are arranged in a longitudinal direction of a reclinable linearly varied by forming the gap width, IDT electrode (20) may be used in to expand frequency bands corresponding to alternating current as well as alternating current number 1 and number 2 according to the frequency value applied finger electrodes (22, 26) which moves along the longitudinal direction of corresponding to be heated locations having inter-distance to reduce inertia effect site.

Thus, when signal is applied to the alternating current having a particular frequency, corresponding to the resonant frequency resonant frequency applied to surface acoustic wave CLK3 only the specific region. Using the same row or 1 1 consisting of segmented [...] display can be implemented. For example, marble English alphabet or preference for displaying or (11b also), results of the diagnostic test can be displayed quantitatively level display (also 11c) permits.

Of the existing method [...] display device (1) is in the form of a rectangular heating-based or carbon nanotube film heater surface such as in such a heating part heating device to prevent, in a rectangular-shaped area is required for uniform quality leads to constant temperature distribution by varying the voltage of the first portion of plurality of heating device arranged manner form discrete uniform quality.

However, AC signal having a frequency of an alternating current signal by applying time division multiplexed via plurality of inclined SIDT (Slanted Finger Interdigital Transducer) generating surface acoustic waves in a plurality of areas within the domestic heating type capable of forming continuous uniform quality and unlike, other heating method through distributors that is difficult to be continuous linear temperature uniform quality can be formed. Certain temperature section gradually feeling comes the change of color of the linear uniform quality not temperature specific discoloration occurs through the use of spatial information feeling it comes the change of color pigment (12 also) continuous [...] chromatic grade information visually displays the display permits (12d also).

Or more of the present invention preferred embodiment through is described but, on of the drawings and detailed description of the invention is not limited to claim the present invention refers to the preface is in the range capable in addition of the present invention to various embodiment and the modified or altering the range of course have disclosed.