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12-10-2011 дата публикации

MEMS display device and method of driving such a device

Номер: CN102214447A

Автор: Kothari Manish, Mathew Mithran C., Chui Clarence, Mignard Marc, Sampsell Jeffrey B.

Принадлежит:

The invention relates to an MEMS display device and a method of driving such a device. Embodiments of exemplary MEMS interferometric modulators are arranged at intersections of rows and columns of electrodes. In certain embodiments, the column electrode has a lower electrical resistance than the row electrode. A driving circuit applies a potential difference of a first polarity across electrodes during a first phase and then quickly transitions to applying a bias voltage having a polarity opposite to the first polarity during a second phase. In certain embodiments, an absolute value of the difference between the voltages applied to the row electrode is less than an absolute value of the difference between the voltages applied to the column electrode during the first and second phases.

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Номер записи: 1

20-09-2012 дата публикации

SYSTEM AND METHOD OF SENSING ACTUATION AND RELEASE VOLTAGES OF AN INTERFEROMETRIC MODULATOR

Номер: US20120235981A1

Автор: Chui Clarence, Mathew Mithran C., Mignard Marc, Sampsell Jeffrey B.

Принадлежит: QUALCOMM MEMS Technologies, Inc.

A method for sensing the actuation and/or release voltages of a electromechanical system or a microelectromechanical device include applying a varying voltage to the device and sensing its state and different voltage levels. In one embodiment, the device is part of a system comprising an array of interferometric modulators suitable for a display. The method can be used to compensate for temperature dependent changes in display pixel characteristics. 1. A system comprising:one or more electromechanical devices;a drive circuit configured to apply one or more test voltages or currents; anda sensing circuit configured to sense a state of at least one of the one or more electromechanical devices and determine one or both of an actuation voltage and a release voltage based at least in part on the sensed state of the at least one of the one or more electromechanical devices, wherein the sensing circuit is further configured to compare a sensed voltage of said at least one of the one or more electromechanical devices to a threshold voltage.2. The system of claim 1 , wherein the one or more electromechanical devices includes one or more display elements.3. The system of claim 1 , wherein the one or more electromechanical devices are arranged in an array to display images in response to signals from the drive circuit.4. The system of claim 1 , wherein the sensing circuit includes resistive and capacitive elements in parallel.5. The system of claim 1 , wherein the sensing circuit includes an integrator with one or more passive feedback components.6. The system of claim 1 , further comprising a timing control circuit.7. The system of claim 6 , wherein the timing control circuit and the sensing circuit are embodied in an integrated circuit.8. The system of claim 6 , wherein the timing control circuit controls an activation of the one or more electromechanical devices.9. The system of claim 1 , wherein the one or more electromechanical devices include one or more interferometric ...

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Номер записи: 2

14-11-2013 дата публикации

SYSTEM AND METHOD OF SENSING ACTUATION AND RELEASE VOLTAGES OF AN INTERFEROMETRIC MODULATOR

Номер: US20130300439A1

Автор: Chui Clarence, Mathew Mithran C., Mignard Marc, Sampsell Jeffrey B.

Принадлежит:

A method for sensing the actuation and/or release voltages of a electromechanical system or a microelectromechanical device include applying a test pulse to the device and sensing its state. In one embodiment, the device is part of a system comprising an array of interferometric modulators suitable for a display. The method can be used to compensate for temperature dependent changes in display pixel characteristics. 1. A display device comprising:one or more electromechanical devices;a filter resistor connected in series with each row of electromechanical devices; anda sensing circuit for measuring the collective capacitance of each row of electromechanical devices.2. The display device of claim 1 , further comprising a driver circuit configured to sense an output of the sensor to determine a threshold voltage for use in testing the state of one or more of the devices.3. The system of claim 1 , wherein the one or more electromechanical devices includes one or more display elements.4. The system of claim 2 , wherein the one or more electromechanical devices are arranged in an array to display images in response to signals from the driver circuit.5. The system of claim 1 , wherein the sensing circuit comprises resistive and capacitive elements in parallel.6. The system of claim 1 , wherein the sensing circuit comprises an integrator with one or more passive feedback components.7. The system of claim 1 , further comprising a timing control circuit.8. The system of claim 7 , wherein the timing control circuit and the sensing circuit are embodied in an integrated circuit.9. The system of claim 7 , wherein the timing control circuit controls an activation of the one or more electromechanical devices.10. The system of claim 1 , wherein the one or more electromechanical devices include one or more interferometric modulators.11. The system of claim 1 , wherein the one or more electromechanical devices include a reflective surface.12. The system of claim 1 , wherein the one ...

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Номер записи: 3

19-04-2011 дата публикации

Drive method for MEMS devices

Номер: US7928940B2

Автор: Clarence Chui, Jeffrey B. Sampsell, Manish Kothari, Marc Mignard, Mithran C. Mathew

Принадлежит: Qualcomm Mems Technologies Inc

Embodiments of exemplary MEMS interferometric modulators are arranged at intersections of rows and columns of electrodes. In certain embodiments, the column electrode has a lower electrical resistance than the row electrode. A driving circuit applies a potential difference of a first polarity across electrodes during a first phase and then quickly transition to applying a bias voltage having a polarity opposite to the first polarity during a second phase. In certain embodiments, an absolute value of the difference between the voltages applied to the row electrode is less than an absolute value of the difference between the voltages applied to the column electrode during the first and second phases.

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Номер записи: 4

10-09-2009 дата публикации

Номер: JP2009163230A

Автор: Clarence Chui, Marc Mignard, Mithran C Mathew, クラレンス・チュイ, マーク・ミグナード, ミスラン・シー・マシュー

Принадлежит: IDC LLC

【課題】簡単にカラー表示できるディスプレイを提供する。【解決手段】ドライブ制御から、光干渉変調器のようなＭＥＭＳディスプレイ素子のアレイをアドレシングするためのシステム及び方法であり、ディスプレイは、共通に印加された駆動信号を用いてアドレスされるディスプレイ素子のグループを含む。光干渉変調器の応答時間は、変調器を含むドライバ回路の特性抵抗器−キャパシタ時間により、すなわち、変調器の可動鏡が固有の電圧に充電されるまでの時間、変調器の機械的特性、及び空気中を動く可動鏡の抵抗により、影響を受ける。ディスプレイ素子のグループは、異なる応答時間を有するように構成され、そしてそれらの応答時間を表す異なる長さのパルスによって駆動される。他のディスプレイ素子のグループは、異なるアクチュエーション電圧を有するように構成され、それらのアクチュエーション電圧を表す異なる電圧のパルスによって駆動される。【選択図】図７

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Номер записи: 10