# US 2006/0132415 A1 · Liquid crystal display and the driving method thereof

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- Number: US 2006/0132415 A1
- Document ID: US20060132415A1
- Status: Published application
- Kind: A1
- Application number: 11/168,530
- Filed: 2005-06-29
- Published: 2006-06-22
- Earliest claimed: 2004-12-17
- Inventors: Hui-Lung Yu
- Web page: https://patentgrep.com/patent/US20060132415A1

## CPC

- G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors}
- G09G 2320/02: Improving the quality of display appearance
- 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)

## Abstract

A liquid crystal display (LCD) includes a display panel, an adjusting circuit, and a driving circuit. The display panel includes a common electrode. The adjusting circuit is electrically connected with the common electrode. According to the voltage distribution on the common electrode, the adjusting circuit outputs a distribution parameter. The driving circuit receives the distribution parameter and drives the display panel according to the distribution parameter. The adjusting circuit further includes a voltage comparator and a compensating circuit. The voltage comparator is used for measuring the voltage difference between two terminals of the common electrode. The compensating circuit is for obtaining the distribution parameter according to the voltage difference

## Claims

### Claim 1

A driving device for a display panel having a common electrode, comprising:
an adjusting circuit, electrically connected with the common electrode, for providing a distribution parameter according to the voltage distribution of a common electrode voltage of the common electrode; and
a driving circuit for driving the display panel in accordance with the distribution parameter.

### Claim 2 (depends on 1)

The liquid crystal display according to claim 1, wherein the adjusting circuit comprises:
a voltage comparator for measuring a voltage difference between two terminals of the common electrode; and
a compensating circuit for obtaining the distribution parameter according to the voltage difference.

### Claim 3 (depends on 1)

The liquid crystal display according to claim 1, wherein the driving circuit is for adjusting a plurality of gray level values according to the distribution parameter and to drive the liquid crystal display panel according to the gray level values.

### Claim 4 (depends on 1)

The liquid crystal display according to claim 1, wherein the driving circuit comprises a plurality of drive chips, each of the drive chips receives one set of Gamma voltages, and the sets of Gamma voltages are generated according to the distribution parameter.

### Claim 5 (depends on 4)

The liquid crystal display according to claim 4, wherein the driving circuit further comprises a plurality of voltage adjusters electrically connected with the corresponding drive chips for adjusting the corresponding set of Gamma voltages of each drive chip according to the distribution parameter.

### Claim 6

A driving method for a liquid crystal display having a display panel and a driving circuit, the display panel having a common electrode, the method comprising:
providing a distribution parameter in accordance with a voltage distribution of a common electrode voltage on the common electrode; and
driving the display panel by the driving circuit according to the distribution parameter.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the step of providing the distribution parameter comprises measuring a voltage difference between two terminals of the common electrode so as to obtain the distribution parameter.

### Claim 8 (depends on 6)

The method according to claim 6, wherein the step of driving the display panel comprises adjusting a plurality of gray level values according to the distribution parameter and driving the display panel according to the gray level values.

### Claim 9 (depends on 6)

The method according to claim 6, wherein the step of driving the display panel including driving the display panel according to a plurality of sets of Gamma voltages generated according to the distribution parameter.