# US 8,786,532 B2 · Pixel structure and forming method and driving method thereof

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- Number: US 8,786,532 B2
- Document ID: US8786532B2
- Status: Granted
- Kind: B2
- Application number: 13/495,600
- Filed: 2012-06-13
- Published: 2012-10-25
- Granted: 2014-07-22
- Earliest claimed: 2007-09-06
- Assignees: Au Optronics Corporation
- Applicants: Jenn-Jia Su; Ming-Feng Tien; Chia-Jung Yang; Ting-Jui Chang; Po-Lun Chen
- Inventors: Jenn-Jia Su; Ming-Feng Tien; Chia-Jung Yang; Ting-Jui Chang; Po-Lun Chen
- Web page: https://patentgrep.com/patent/US8786532B2

## CPC

- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- G02F 1/134345: {Subdivided pixels, e.g. for grey scale or redundancy}
- G02F 1/134354: {the sub-pixels being capacitively coupled}
- G09G 2300/043: Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
- G09G 2300/0447: for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
- G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update
- G09G 2310/06: Details of flat display driving waveforms
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A method for driving a pixel electrode disposed on a first substrate operates by providing a voltage corresponding to a displaying data to the pixel electrode and a control electrode, such that the pixel electrode and the control electrode are at a floating connection state; providing a first coupling voltage to a coupling electrode; and coupling a variation of a first coupling voltage to the control electrode via at least one coupling capacitor, such that an absolute value of a voltage difference between the control electrode and a common electrode substantially greater than an absolute value of a voltage difference between the pixel electrode and the common electrode, wherein the common electrode is disposed on a second substrate and the second substrate is corresponding to the first substrate.

## Claims

### Claim 1

A method for driving a pixel structure, the pixel structure disposed on a first substrate and electrically coupled to at least one scan line and at least one data line, the pixel structure having a first switch device, a second switch device, at least one pixel electrode, at least one control electrode, and at least one coupling electrode, the first switch device and the second switch device electrically coupled to the same scan line and the same data line, the method comprising:
turning on the first switch device and the second switch device simultaneously, providing a voltage corresponding to a displaying data to the pixel electrode via the second device and to the control electrode via the first switch device, wherein the pixel electrode directly receives the voltage from the second switch device and not receives the voltage from the first switch device, but the control electrode directly receives the voltage from the first switch device and not receives the voltage from the second switch device, such that the pixel electrode and the control electrode are at a floating connection state;
providing a first coupling voltage to the coupling electrode; and
coupling a variation of the first coupling voltage to the control electrode via at least one coupling capacitor, such that an absolute value of a voltage difference between the control electrode and a common electrode substantially is greater than an absolute value of a voltage difference between the pixel electrode and the common electrode, wherein the common electrode is disposed on a second substrate and the second substrate is corresponding to the first substrate.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
providing a first coupling voltage to one end of a first storage capacitor and coupling a variation of the first coupling voltage to the pixel electrode via the first storage capacitor, wherein the other end of the first storage capacitor is coupled to the pixel electrode; and
providing a second coupling voltage to one end of a second storage capacitor and coupling a variation of the second coupling voltage to the pixel electrode via the second storage capacitor, wherein the other end of the second storage capacitor is coupled to the pixel electrode.

### Claim 3 (depends on 2)

The method of claim 2, wherein the first coupling voltage and the second coupling voltage signals are substantially different.

### Claim 4 (depends on 2)

The method of claim 2, wherein the first coupling voltage and the second coupling voltage signals are substantially the same.

### Claim 5 (depends on 2)

The method of claim 2, wherein the first coupling voltage and the second coupling voltage signals are substantially inverted.

### Claim 6 (depends on 1)

The method of claim 1, wherein the at least one coupling capacitor is formed by the coupling electrode and a portion of the control electrode.

### Claim 7 (depends on 1)

The method of claim 1, wherein the pixel electrode and the control electrode have a capacitor formed therebetween.

### Claim 8 (depends on 1)

The method of claim 1, wherein a source of the first switch device and a source of the second switch device are electrically connected to the same data line, and a gate of the first switch device and a gate of the second switch device are electrically connected to the same scan line, wherein the a drain of the first switch device is electrically coupled to the control electrode.

### Claim 9 (depends on 8)

The method of claim 8, wherein a drain of the second switch device is electrically coupled to the pixel electrode.

### Claim 10 (depends on 1)

The method of claim 1, wherein the coupling electrode does not contact to the pixel electrode.

### Claim 11 (depends on 1)

The method of claim 1, wherein the pixel electrode does not contact to the coupling electrode.

### Claim 12 (depends on 1)

The method of claim 1, wherein the pixel structure further comprises a passivation layer covering the control electrode, wherein the passivation layer is between the pixel electrode and the control electrode, and the passivation layer has an opening exposing the control electrode.

### Claim 13 (depends on 1)

The method of claim 1, wherein the pixel electrode comprises a first portion and a second portion, and wherein the control electrode is interposed between the first portion and the second portion of the pixel electrode.

### Claim 14

A method for driving a pixel structure, the pixel structure disposed on a first substrate and electrically coupled to at least one scan line and at least one data line, wherein the pixel structure has a first switch device and a second switch device, at least one pixel electrode, at least one control electrode, and at least one coupling electrode, wherein each of the first switch device and the second switch device has a gate electrode, a source electrode and a drain electrode, and the gate electrodes of the first and second switch devices and the source electrodes of the first and second switch devices electrically coupled to the corresponding scan line and the corresponding data line, respectively, the method comprising:
turning on the first switch device and the second switch device simultaneously, providing a voltage corresponding to a displaying data to the pixel electrode via the second switch device and the control electrode via the first switch device, wherein the pixel electrode directly receives the voltage from the second switch device and not receives the voltage from the first switch device, but the control electrode directly receives the voltage from the first switch device and not receives the voltage from the second switch device, such that the pixel electrode and the control electrode are at a floating connection state;
providing a first coupling voltage to the coupling electrode;
coupling a variation of the first coupling voltage to the control electrode via at least one coupling capacitor, such that an absolute value of a voltage difference between the control electrode and a common electrode substantially is greater than an absolute value of a voltage difference between the pixel electrode and the common electrode.

### Claim 15 (depends on 14)

The method of claim 14, further comprising:
providing a first coupling voltage to one end of a first storage capacitor and coupling variation of the first coupling voltage to the pixel electrode via the first storage capacitor, wherein the other end of the first voltage capacitor is coupled to the pixel electrode; and
providing a second coupling voltage to one end of the a second storage capacitor and coupling a variation of the second coupling voltage to the pixel electrode via the second storage capacitor, wherein the other end of the second storage capacitor is coupled to the pixel electrode.

### Claim 16 (depends on 15)

The method of claim 15, wherein the coupling voltage and the second coupling voltage are substantially different.

### Claim 17 (depends on 15)

The method of claim 15, wherein the coupling voltage and the second coupling voltage are substantially the same.

### Claim 18 (depends on 15)

The method of claim 15, wherein the coupling voltage and the second coupling voltage are substantially inverted.

### Claim 19 (depends on 14)

The method of claim 14, wherein the at least one coupling capacitor is formed by the coupling electrode and a portion of the control electrode.

### Claim 20 (depends on 14)

The method of claim 14, wherein the pixel electrode and the control electrode have a capacitor formed therebetween.

### Claim 21 (depends on 14)

The method of claim 14, wherein the at least one coupling capacitor is formed between the common electrode and the control electrode.