# US 2014/0152645 A1 · Lcd panel driving method, driving circuit and lcd device

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- Number: US 2014/0152645 A1
- Document ID: US20140152645A1
- Status: Published application
- Kind: A1
- Application number: 13/807,283
- Filed: 2012-12-07
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Inventors: Dongsheng Guo
- Web page: https://patentgrep.com/patent/US20140152645A1

## CPC

- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- G09G 3/3677: {suitable for active matrices only}
- G09G 2310/0205: Simultaneous scanning of several lines in flat panels
- G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage
- G09G 2310/067: Special waveforms for scanning, where no circuit details of the gate driver are given
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- 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 driving method of a liquid crystal display (LCD) panel comprises a scan driving process and a data driving process. In the scan driving process, overlapping time regions are formed simultaneously between a positive edge and a negative edge of the scan lines when a drive of a last row of a scan line is switched to drive of a next row of the scan line. In the data driving process, when a time of data signal corresponding to the last row of the scan line overlaps a time of the overlapping time regions, the data signal corresponding to the next row of the scan line are outputted.

## Claims

### Claim 1

A driving method of a liquid crystal display (LCD) panel, comprising:
a scan driving process, where in the scan driving process, simultaneously forming overlapping time regions between a positive edge and a negative edge of the scan lines when drive of a last row of a scan line is switched to drive of a next row of the scan line; and
outputting a data signal corresponding to the next row of the scan line when a time of data signal corresponding to the last row of the scan line overlaps a time of the overlapping time regions.

### Claim 2 (depends on 1)

The driving method of the LCD panel of the claim 1, wherein the data driving process comprises:
A. starting to nine when the drive of the last row of the an line is switched to the drive of the next row of the scan line;
B. presetting a delay time; outputting a data activating signal when the time reaches the delay time, where sum of the delay time and duration time of the data activating signal is not less than time of the overlapping time regions;
C. outputting the data signal corresponding to the next row of the scan line via a trigger of the data activating signal.

### Claim 3 (depends on 2)

The driving method of the LCD panel of claim 2, wherein the sum of the delay time and the duration time of the data activating signal is equal to the time of overlapping time regions; in the step C, outputting data line driving signals at a negative edge of the data activating signal.

### Claim 4 (depends on 2)

The driving method of the LCD panel of claim 2, wherein in the step B, the delay time is not less than sustained time of the overlapping time regions; in the step C, data line driving signals are outputted at a positive edge of the data activating signal.

### Claim 5 (depends on 2)

The driving method of the LCD panel of claim 2, wherein the scan driving process comprises: outputting a start pulse signal, outputting a clock pulse signal, driving the last row of the scan line at a positive edge of a previous clock pulse signal, ending the drive of the last row of the scan line at a positive edge of a next row of the clock pulse signal, and t driving the next row of the scan line;
the step B of the data driving process comprises: the sum of the delay time and the duration time of the data activating signal is equal to the time of the overlapping time regions;
the step C of the data driving process comprises: outputting data line driving signals at a negative edge of the data activating signal.

### Claim 6

A driving circuit of a liquid crystal display (LCD) panel, comprising:
scan lines, a scan driving chip coupled to the scan lines, data lines, a data driving chip coupled to the data lines, and a data monitoring module;
the data driving chip forming simultaneously overlapping time regions between a positive edge and a negative edge of the scan lines when the data driving chip switches drive of a last row of a scan line to drive of a next row of the scan line;
wherein the data monitoring module outputs a data signal corresponding to the next row of the scan line when a time of the data signal corresponding to the last row of the scan line overlaps a time of the overlapping time regions.

### Claim 7 (depends on 6)

The driving circuit of the LCD panel of claim 6, wherein the data monitoring module comprises a detection module, a control module, and a timing module that presets a delay time; when the detection module detects that the drive of the last row of the scan line is switched to the drive of the next row of the scan line by the scan driving chip, the timing module starts to time; when the time reaches the delay time, the control module outputs a data activating signal; the data driving chip is controlled to drive the corresponding data lines; the sum of the delay time and duration time of the data activating signal is not less than me of the overlapping time regions.

### Claim 8 (depends on 7)

The driving circuit of the LCD panel of claim 7, wherein the sum of the delay time of the timing module and the duration time of the data activating signal is equal to the time of overlapping time regions; the data driving chip outputs data line driving signals at a negative edge of the data activating signal.

### Claim 9 (depends on 7)

The driving circuit of the LCD panel of claim 7, wherein the delay time of the timing module is not less than the time of the overlapping time regions; the data driving chip outputs data line driving signals at a positive edge of the data activating signal.

### Claim 10

A liquid crystal display (LCD) device, comprising:
a driving circuit of an LCD panel comprising scan lines, a scan driving chip coupled to the scan lines, data lines, a data driving chip coupled to the data lines, and a data monitoring module;
the data driving chip forming simultaneously overlapping time regions between a positive edge and a negative edge of the scan lines when the data driving chip switches drive of a last row of a scan line to drive of a next row of the scan line; wherein the data monitoring module outputs a data signal corresponding to the next row of the scan line when a time of the data signal corresponding to the last row of the scan line overlaps a time of the overlapping time regions.

### Claim 11 (depends on 10)

The LCD device of claim 10, wherein the data monitoring module comprises a detection module, a control module, and a timing module that presets a delay time; when the detection module detects that the drive of the last row of the scan line is switched to the drive of the next row of the scan line by the scan driving chip, the timing module starts to time; when the time reaches the delay time, the control module outputs a data activating signal; the data driving chip is controlled to drive the corresponding data lines; the sum of the delay time and duration time of the data activating signal is not less than time of the overlapping time regions.

### Claim 12 (depends on 11)

The LCD device of claim 11, wherein the sum of the delay time of the timing module and the duration time of the data activating signal is equal to the time of overlapping time regions; the data driving chip outputs data line driving signals at a negative edge of the data activating signal.

### Claim 13 (depends on 11)

The LCD device of claim 11, wherein the delay time of the timing module is not less than the time of the overlapping time regions; the data driving chip outputs data line driving signals at a positive edge of the data activating signal.