# US 7,612,752 B2 · Flat panel display and pixel driving method applied thereto

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- Number: US 7,612,752 B2
- Document ID: US7612752B2
- Status: Granted
- Kind: B2
- Application number: 11/467,961
- Filed: 2006-08-29
- Published: 2007-10-04
- Granted: 2009-11-03
- Earliest claimed: 2006-03-31
- Assignees: Au Optronics Corporation
- Inventors: Shyh-Feng Chen; Kuei-Sheng Tseng; Lee-Hsun Chang; Wen-Bin Chen
- Web page: https://patentgrep.com/patent/US7612752B2

## CPC

- G09G 3/3659: {the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes}
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- 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 pixel driving method applied to a flat panel display is provided. In a first time period, an Nth scan line provides a first scan voltage to a pixel row to conduct the corresponding thin film transistors (TFT). Also, an N+1th scan line provides a second scan voltage through the conducted TFTs to the corresponding first switches to conduct the first switches, and then a number of first data voltages of the corresponding data lines are outputted to the corresponding first pixel electrodes. The absolute value of the difference between the first scan voltage and the second scan voltage is not smaller than a threshold voltage of each TFTs.

## Claims

### Claim 1

A pixel driving method applied to a flat panel display, the flat panel display having a plurality of pixels, a plurality of scan lines, a plurality of data lines, each pixel having a first sub-pixel and a second sub-pixel, each first sub-pixel having a first pixel electrode, a first switch and a thin film transistor (TFT), each second sub-pixel having a second pixel electrode and a second switch, the first switch of each pixel connected to the first pixel electrode and the corresponding data line, the TFT of each pixel connected to the corresponding scan line, the next scan line and the first switch, the second switch of each pixel connected the second pixel electrode, the corresponding scan line and the corresponding data line, the pixel driving method comprising:
in a first time period, providing a first scan voltage to a pixel row among the pixels by the corresponding scan line to conduct the corresponding TFTs, and providing a second scan voltage through the conducted TFTs to the corresponding first switches by the next scan line to conduct the first switches, and then transmitting a plurality of first data voltages to the corresponding first pixel electrodes by the corresponding data lines, wherein the absolute value of the difference between the first scan voltage and the second scan voltage is not smaller than a threshold voltage of the TFTs, and
in a second time period, providing a third scan voltage to the pixel row by the corresponding scan line to conduct the corresponding TFTs and the corresponding second switches, and providing a fourth scan voltage through the conducted TFTs to the corresponding first switches by the next scan line to turn off the first switches, at the same time, outputting a plurality of second data voltages of the corresponding data lines via the conducted second switches to the corresponding second pixel electrodes.

### Claim 2 (depends on 1)

The pixel driving method according to claim 1 further comprising:
in the first time period, conducting the corresponding second switches by the first scan voltage provided by the corresponding scan line, and outputting the first data voltages of the corresponding data lines via the conducted second switches to the second pixel electrodes.

### Claim 3 (depends on 1)

The pixel driving method according to claim 1 further comprising:
in a third time period, providing a fifth scan voltage to the pixel row by the scan line to turn off the corresponding TFTs and the second switches.

### Claim 4 (depends on 3)

The pixel driving method according to claim 3, wherein the first scan voltage and the second scan voltage are both high-level voltages, and the difference between the first scan voltage and the second scan voltage is substantially equal to the threshold voltage.

### Claim 5 (depends on 4)

The pixel driving method according to claim 4, wherein the fourth scan voltage and the fifth scan voltage are both low-level voltages, and the fourth scan voltage is substantially equal to the fifth scan voltage.

### Claim 6 (depends on 5)

The pixel driving method according to claim 5, wherein the second scan voltage is substantially equal to the third scan voltage.

### Claim 7 (depends on 1)

The pixel driving method according to claim 1, wherein the TFT and the first switch and the second switch of the pixels are metal oxide semiconductor (MOS) field effect transistors.

### Claim 8

A flat panel display comprising:
a substrate having a plurality of scan lines and a plurality of data lines;
a display area having a plurality of pixels sited on the substrate and correspondingly connected to the scan lines and the data lines, each pixel having:
a first sub-pixel having:
a first pixel electrode;
a first switch connected to the first pixel electrode and the corresponding data line; and
a thin film transistor (TFT) connected to the corresponding scan line, the next scan line and the first switch;
a second sub-pixel having:
a second pixel electrode; and
a second switch connected to the second pixel electrode, the corresponding scan line and the corresponding data line;
wherein in a first time period, the scan line outputs a first scan voltage to a pixel row among the pixels to conduct the corresponding TFTs, the next scan line also outputs a second scan voltage via the conducted TFTs to the corresponding first switches to conduct the first switches, and a plurality of first data voltages are transmitted to the corresponding first pixel electrodes through the corresponding data lines and the conducted first switched, and the absolute value of the difference between the first scan voltage and the second scan voltage is not smaller than a threshold voltage of each TFT;
wherein in a second time period, the scan line provides a third scan voltage to the pixel row to conduct the corresponding TFTs and the second switches, the next scan line also provides a fourth scan voltage through the conducted TFTs to the corresponding first switches to turn off the first switches, at the same time, the corresponding data lines output a plurality of second data voltages via the conducted second switches to the corresponding second pixel electrodes.

### Claim 9 (depends on 8)

The flat panel display according to claim 8, wherein in the first time period, the first scan voltage outputted by the scan line conducts the second switches, and then the corresponding data lines output the first data voltages via the conducted second switches to the second pixel electrodes.

### Claim 10 (depends on 8)

The flat panel display according to claim 8, wherein in a third time period, the scan line outputs a fifth scan voltage to the pixel row to turn off the corresponding TFTs and the second switches.

### Claim 11 (depends on 10)

The flat panel display according to claim 10, wherein the difference between the first scan voltage and the second scan voltage is substantially equal to the threshold voltage.

### Claim 12 (depends on 11)

The flat panel display according to claim 11, wherein the fourth scan voltage is substantially equal to the fifth scan voltage.

### Claim 13 (depends on 12)

The flat panel display according to claim 12, wherein the second scan voltage is substantially equal to the third scan voltage.

### Claim 14 (depends on 8)

The flat panel display according to claim 8, wherein the TFT and the first switch and the second switch of the pixels are metal oxide semiconductor (MOS) field effect transistors.

### Claim 15 (depends on 8)

The flat panel display according to claim 8, wherein the flat panel display is a liquid crystal display (LCD).