# US 9,437,147 B2 · Polarity inversion driving method, driving apparatus and liquid crystal display device

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- Number: US 9,437,147 B2
- Document ID: US9437147B2
- Status: Granted
- Kind: B2
- Application number: 14/367,825
- Filed: 2013-05-08
- Published: 2015-08-06
- Granted: 2016-09-06
- Earliest claimed: 2013-03-06
- Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd.
- Inventors: Xingji Wu; Yizhen Xu; Liang Zhang
- Web page: https://patentgrep.com/patent/US9437147B2

## CPC

- G09G 3/3614: {Control of polarity reversal in general}
- G09G 3/36: using liquid crystals
- G09G 3/3688: {suitable for active matrices only}
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2320/0204: Compensation of DC component across the pixels in flat panels
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- G09G 2370/08: Details of image data interface between the display device controller and the data line driver circuit
- 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 polarity inversion driving method, a driving apparatus and a liquid crystal display device, for attenuating the flickers due to POL inversion. The polarity inversion driving method is used for inversion of polarity of pixels on the liquid crystal panel, and comprises: generating a polarity inversion reference signal for reflecting selection of polarity of each row of pixels on the liquid crystal panel; generating a control signal comprising control levels generated in m frames, where m is an integer higher than or equal to two, wherein width of the control level in each of the m frames is gradually increased in chronological order to be equal to a time length of one frame; as an alternative, the width of the control level in each of the m frames is gradually decreased in chronological order from the time length of one frame to zero; and generating a polarity inversion signal from the polarity inversion reference signal and the control signal.

## Claims

### Claim 1

A polarity inversion driving method for inversion of polarity of pixels on a liquid crystal panel, comprising:
generating a polarity inversion reference signal for reflecting selection of polarity of each row of pixels on the liquid crystal panel;
generating a control signal comprising control levels generated in m frames, where m is an integer higher than or equal to two,
wherein width of the control level in each of the m frames is gradually increased in chronological order from zero to be a time length of one frame, wherein the width of the control level is increased once every r frames and a time duration for scanning s rows is increased every time until the width of the control level is equal to the time length of one frame, where r is an integer higher than or equal to one and s is an integer higher than or equal to one; or
the width of the control level in each of the m frames is gradually decreased in chronological order from the time length of one frame to zero; and
generating a polarity inversion signal from the polarity inversion reference signal and the control signal so as to complete a polarity inversion gradually in a time period of a plurality of frames.

### Claim 2 (depends on 1)

The polarity inversion driving method according to claim 1, wherein,
the control signal comprises the control level as a high level and a non-control level as a low level; wherein
generating the polarity inversion signal from the polarity inversion reference signal and the control signal is as follows: performing an XOR operation between the polarity inversion reference signal and the control signal to obtain the polarity inversion signal.

### Claim 3 (depends on 2)

The polarity inversion driving method according to claim 2, further comprising, after the width of the control level in each of the m frames is gradually increased in chronological order to be equal to a time length of one frame, gradually decreasing the width of the control level in each of the n frames in chronological order from the time length of one frame to zero, where n is an integer higher than or equal to two.

### Claim 4 (depends on 2)

The polarity inversion driving method according to claim 2, further comprising, after the width of the control level in each of the m frames is gradually decreased in chronological order from the time length of one frame to zero, gradually increasing the width of the control level in each of the n frames in chronological order from zero to a time length of one frame, where n is an integer higher than or equal to two.

### Claim 5 (depends on 1)

The polarity inversion driving method according to claim 1, further comprising, after the width of the control level in each of the m frames is gradually increased in chronological order to be equal to a time length of one frame, gradually decreasing the width of the control level in each of the n frames in chronological order from the time length of one frame to zero, where n is an integer higher than or equal to two.

### Claim 6 (depends on 1)

The polarity inversion driving method according to claim 1, further comprising, after the width of the control level in each of the m frames is gradually decreased in chronological order from the time length of one frame to zero, gradually increasing the width of the control level in each of the n frames in chronological order from zero to a time length of one frame, where n is an integer higher than or equal to two.

### Claim 7

A polarity inversion driving apparatus for inversion of polarity of pixels on a liquid crystal panel, comprising:
a reference signal generation unit configure to generate a polarity inversion reference signal for reflecting selection of polarity of each row of pixels on the liquid crystal panel;
a control signal generation unit configure to generate a control signal comprising control levels generated in m frames, where m is an integer higher than or equal to two, wherein width of the control level in each of the m frames is gradually increased in chronological order from zero to be equal to a time length of one frame, wherein the width of the control level is increased once every r frames and a time duration for scanning s rows is increased every time until the width of the control level is equal to the time length of one frame, where r is an integer higher than or equal to one and s is an integer higher than or equal to one; as an alternative, the width of the control level in each of the m frames is gradually decreased in chronological order from a time length of one frame to zero; and
an inversion signal generation unit configure to generate a polarity inversion signal from the polarity inversion reference signal and the control signal so as to complete a polarity inversion gradually in a time period of a plurality of frames.

### Claim 8 (depends on 7)

The polarity inversion driving apparatus according to claim 7, wherein,
the control signal comprises the control level and a non-control level, wherein the control level is a high level, and the non-control level is a low level; and
the inversion signal generation unit configure to perform an XOR operation between the polarity inversion reference signal and the control signal to obtain the polarity inversion signal.

### Claim 9 (depends on 8)

The polarity inversion driving apparatus according to claim 8, wherein, the control signal generation unit configure to enable, after the width of the control level in each of the m frames is gradually increased in chronological order to be equal to a time length of one frame, the width of the control level in each of the n frames to be gradually decreased in chronological order from the time length of one frame to zero, where n is an integer higher than or equal to two.

### Claim 10 (depends on 8)

The polarity inversion driving apparatus according to claim 8, wherein, the control signal generation unit configure to enable, after the width of the control level in each of the m frames is gradually decreased in chronological order from the time length of one frame to zero, the width of the control level in each of the n frames to be gradually increased in chronological order from zero to the time length of one frame, where n is an integer higher than or equal to two.

### Claim 11 (depends on 7)

The polarity inversion driving apparatus according to claim 7, wherein, the control signal generation unit configure to enable, after the width of the control level in each of the m frames is gradually increased in chronological order to be equal to a time length of one frame, the width of the control level in each of the n frames to be gradually decreased in chronological order from the time length of one frame to zero, where n is an integer higher than or equal to two.

### Claim 12 (depends on 7)

The polarity inversion driving apparatus according to claim 7, wherein, the control signal generation unit configure to enable, after the width of the control level in each of the m frames is gradually decreased in chronological order from the time length of one frame to zero, the width of the control level in each of the n frames to be gradually increased in chronological order from zero to the time length of one frame, where n is an integer higher than or equal to two.

### Claim 13 (depends on 7)

A liquid crystal display device, comprising any one of the polarity inversion driving apparatuses according to claim 7.

### Claim 14 (depends on 13)

The liquid crystal display device according to claim 13, wherein,
the control signal comprises the control level and a non-control level, wherein the control level is a high level, and the non-control level is a low level; and
the inversion signal generation unit configure to perform an XOR operation between the polarity inversion reference signal and the control signal to obtain the polarity inversion signal.

### Claim 15 (depends on 14)

The liquid crystal display device according to claim 14, wherein, the control signal generation unit configure to enable, after the width of the control level in each of the m frames is gradually increased in chronological order to be equal to a time length of one frame, the width of the control level in each of the n frames to be gradually decreased in chronological order from the time length of one frame to zero, where n is an integer higher than or equal to two.

### Claim 16 (depends on 14)

The liquid crystal display device according to claim 14, wherein, the control signal generation unit configure to enable, after the width of the control level in each of the m frames is gradually decreased in chronological order from the time length of one frame to zero, the width of the control level in each of the n frames to be gradually increased in chronological order from zero to the time length of one frame, where n is an integer higher than or equal to two.

### Claim 17 (depends on 13)

The liquid crystal display device according to claim 13, wherein, the control signal generation unit configure to enable, after the width of the control level in each of the m frames is gradually increased in chronological order to be equal to a time length of one frame, the width of the control level in each of the n frames to be gradually decreased in chronological order from the time length of one frame to zero, where n is an integer higher than or equal to two.

### Claim 18 (depends on 13)

The liquid crystal display device according to claim 13, wherein, the control signal generation unit configure to enable, after the width of the control level in each of the m frames is gradually decreased in chronological order from the time length of one frame to zero, the width of the control level in each of the n frames to be gradually increased in chronological order from zero to the time length of one frame, where n is an integer higher than or equal to two.