# US 10,311,815 B2 · Liquid crystal display panel and inversion control method and device for the same

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- Number: US 10,311,815 B2
- Document ID: US10311815B2
- Status: Granted
- Kind: B2
- Application number: 15/844,941
- Filed: 2017-12-18
- Published: 2018-09-06
- Granted: 2019-06-04
- Earliest claimed: 2017-03-03
- 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: Zhetao Xu
- Web page: https://patentgrep.com/patent/US10311815B2

## CPC

- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- G02F 1/1343: Electrodes {(reflective electrodes G02F1/133553)}
- G09G 3/3614: {Control of polarity reversal in general}
- G02F 2203/30: Gray scale
- G09G 2320/0209: Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
- 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

The present disclosure provides a liquid crystal display panel, and an inversion control method and device for the same. The method includes: applying a first inversion signal corresponding to a current image frame to a plurality of pixel blocks of the liquid crystal display panel; determining a target pixel block from the plurality of pixel blocks, wherein a charge accumulation value of a target pixel row where the target pixel block is located is greater than or equal to a first preset threshold, and a charge accumulation value of the target pixel block is greater than or equal to a second preset threshold; and applying a second inversion signal reverse to the first inversion signal to the target pixel block.

## Claims

### Claim 1

An inversion control method for a liquid crystal display panel, comprising: applying a first inversion signal corresponding to a current image frame to a plurality of pixel blocks of the liquid crystal display panel; determining a target pixel block from the plurality of pixel blocks, wherein a charge accumulation value of a target pixel row where the target pixel block is located is greater than or equal to a first preset threshold, and a charge accumulation value of the target pixel block is greater than or equal to a second preset threshold; and applying a second inversion signal reverse to the first inversion signal to the target pixel block, wherein the determining a target pixel block from the plurality of pixel blocks comprises: detecting a charge accumulation value of each pixel row in a plurality of pixel rows of the liquid crystal display panel, wherein each pixel row comprises N pixel blocks, and the N is a positive integer; determining a pixel row with a charge accumulation value greater than or equal to the first preset threshold as the target pixel row; and determining, from N pixel blocks of the target pixel row, a pixel block with a charge accumulation value greater than or equal to the second preset threshold as the target pixel block, wherein each pixel block comprises a same number of subpixels, wherein the detecting a charge accumulation value of each pixel row in a plurality of pixel rows of the liquid crystal display panel comprises: obtaining a number of positively changing subpixels and a number of negatively changing subpixels in each of the pixel rows; calculating a first difference value between the number of positively changing subpixels and the number of negatively changing subpixels in each of the pixel rows; and determining that the charge accumulation value of the pixel row is greater than or equal to the first preset threshold in the case that the first difference value is greater than a third preset threshold; wherein the number of positively changing subpixels comprises a number of subpixels whose source voltage polarities are changed from negative into positive, and the number of negatively changing subpixels comprises a number of subpixels whose source voltage polarities are changed from positive into negative, and wherein the determining, from N pixel blocks of the target pixel row, a pixel block with a charge accumulation value greater than or equal to the second preset threshold as the target pixel block comprises: obtaining a number of positively changing subpixels and a number of negatively changing subpixels in each of the pixel blocks of the target pixel row; calculating a second difference value between the number of positively changing subpixels and the number of negatively changing subpixels in each of the pixel blocks of the target pixel row; and determining that the charge accumulation value in the pixel block is greater than or equal to the second preset threshold in the case that the second difference value is greater than a fourth preset threshold.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the charge accumulation value of each pixel row is detected by a time controller in a liquid crystal display panel.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising: applying a third inversion signal to each of the plurality of pixel blocks, wherein the third inversion signal is generated according to a next image frame corresponding to the plurality of pixel blocks.

### Claim 4 (depends on 1)

The method according to claim 1, wherein: the first preset threshold is preset according to a resolution and a parasitic capacitance of the liquid crystal display panel; and/or the second preset threshold is preset according to a resolution, a parasitic capacitance and a number of pixel blocks of the liquid crystal display panel.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the first preset threshold is greater than the second preset threshold.

### Claim 6

An inversion control device for a liquid crystal display panel, comprising: a processor and a memory, the processor, by executing instructions stored in the memory, configured to: apply a first inversion signal corresponding to a current image frame to a plurality of pixel blocks of the liquid crystal display panel, determine a target pixel block from the plurality of pixel blocks, and apply a second inversion signal reverse to the first inversion signal to the target pixel block; wherein a charge accumulation value of a target pixel row where the target pixel block is located is greater than or equal to a first preset threshold, and a charge accumulation value of the target pixel block is greater than or equal to a second preset threshold, wherein the processor is further configured to: detect a charge accumulation value of each pixel row in a plurality of pixel rows of the liquid crystal display panel, wherein each pixel row comprises N pixel blocks, and the N is a positive integer; determine a pixel row with a charge accumulation value greater than or equal to the first preset threshold as the target pixel row; and determine, from N pixel blocks of the target pixel row, a pixel block with a charge accumulation value greater than or equal to the second preset threshold as the target pixel block, wherein each pixel block comprises a same number of subpixels, wherein the processor is further configured to: obtain a number of positively changing subpixels and a number of negatively changing subpixels in each of the pixel rows; calculate a first difference value between the number of positively changing subpixels and the number of negatively changing subpixels in each of the pixel rows; and determine that the charge accumulation value of the pixel row is greater than or equal to the first preset threshold in the case that the first difference value is greater than a third preset threshold; wherein the number of positively changing subpixels comprises a number of subpixels whose source voltage polarities are changed from negative into positive, and the number of negatively changing subpixels comprises a number of subpixels whose source voltage polarities are changed from positive into negative, wherein the processor is further configured to: obtain a number of positively changing subpixels and a number of negatively changing subpixels in each of the pixel blocks of the target pixel row; calculate a second difference value between the number of positively changing subpixels and the number of negatively changing subpixels in each of the pixel blocks of the target pixel row; and determine that the charge accumulation value in the pixel block is greater than or equal to the second preset threshold in the case that the second difference value is greater than a fourth preset threshold.

### Claim 7 (depends on 6)

The device according to claim 6, wherein the charge accumulation value of each pixel row is detected by a time controller of the liquid crystal display panel.

### Claim 8 (depends on 6)

The device according to claim 6, wherein the processor is further configured to apply a third inversion signal to each of the plurality of pixel blocks, wherein the third inversion signal is generated according to a next image frame corresponding to the plurality of pixel blocks.

### Claim 9 (depends on 6)

The device according to claim 6, wherein: the first preset threshold is preset according to a resolution and a parasitic capacitance of the liquid crystal display panel; and/or the second preset threshold is preset according to a resolution, a parasitic capacitance and a number of pixel blocks of the liquid crystal display panel.

### Claim 10 (depends on 6)

The device according to claim 6, wherein the first preset threshold is greater than the second preset threshold.

### Claim 11

A liquid crystal display panel, comprising: an inversion control device comprising: a processor and a memory, the processor, by executing instructions stored in the memory, configured to: apply a first inversion signal corresponding to a current image frame to a plurality of pixel blocks of the liquid crystal display panel, determine a target pixel block from the plurality of pixel blocks, and apply a second inversion signal reverse to the first inversion signal to the target pixel block; wherein a charge accumulation value of a target pixel row where the target pixel block is located is greater than or equal to a first preset threshold, and a charge accumulation value of the target pixel block is greater than or equal to a second preset threshold, wherein the processor is further configured to: detect a charge accumulation value of each pixel row in a plurality of pixel rows of the liquid crystal display panel, wherein each pixel row comprises N pixel blocks, and the N is a positive integer; determine a pixel row with a charge accumulation value greater than or equal to the first preset threshold as the target pixel row; and determine, from N pixel blocks of the target pixel row, a pixel block with a charge accumulation value greater than or equal to the second preset threshold as the target pixel block, wherein each pixel block comprises a same number of subpixels, wherein the processor is further configured to: obtain a number of positively changing subpixels and a number of negatively changing subpixels in each of the pixel rows; calculate a first difference value between the number of positively changing subpixels and the number of negatively changing subpixels in each of the pixel rows; and determine that the charge accumulation value of the pixel row is greater than or equal to the first preset threshold in the case that the first difference value is greater than a third preset threshold; wherein the number of positively changing subpixels comprises a number of subpixels whose source voltage polarities are changed from negative into positive, and the number of negatively changing subpixels comprises a number of subpixels whose source voltage polarities are changed from positive into negative, wherein the processor is further configured to: obtain a number of positively changing subpixels and a number of negatively changing subpixels in each of the pixel blocks of the target pixel row; calculate a second difference value between the number of positively changing subpixels and the number of negatively changing subpixels in each of the pixel blocks of the target pixel row; and determine that the charge accumulation value in the pixel block is greater than or equal to the second preset threshold in the case that the second difference value is greater than a fourth preset threshold.