Liquid crystal display device and driving method compensating grayscale data voltages to offset voltages of common electrode (VCOM) shift

Patent metadata

Field	Value
Publication number	US-11380279-B2
Application number	US-201816315331-A
Country	US
Kind code	B2
Filing date	Jun 11, 2018
Priority date	Sep 27, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

The present disclosure is related to a display driving method. The display driving method may include obtaining a grayscale data voltage compensation table; calculating a value of VCOM shift amplitude corresponding to a row of sub-pixels on a display panel based on grayscale data voltages of a frame of an image to be displayed; obtaining a grayscale data voltage compensation value corresponding to the row of sub-pixels on the display panel based on the calculated value of VCOM shift amplitude and the grayscale data voltage compensation table; compensating grayscale data voltages actually inputted to the row of sub-pixels based on the grayscale data voltage compensation value to obtain compensated grayscale data voltages; and outputting the compensated grayscale data voltages to the row of sub-pixels during a display time of the frame of the image to be displayed.

First claim

What is claimed is:

1. A display driving method, comprising:
obtaining a grayscale data voltage compensation table, wherein the grayscale data voltage compensation table stores mapping relationship between voltages of common electrodes (VCOM) shift amplitudes and grayscale data voltage compensation values;
calculating a VCOM shift amplitude corresponding to a row of sub-pixels on a display panel based on grayscale data voltages of a frame of an image to be displayed;
obtaining a grayscale data voltage compensation value corresponding to the row of sub-pixels on the display panel based on the calculated VCOM shift amplitude and the grayscale data voltage compensation table;
compensating grayscale data voltages actually inputted to the row of sub-pixels based on the grayscale data voltage compensation value to obtain compensated grayscale data voltages; and
outputting the compensated grayscale data voltages to the row of sub-pixels during a display time of the frame of the image to be displayed;
wherein calculating the VCOM shift amplitude corresponding to the row of sub-pixels on the display panel based on the grayscale data voltages of the frame of the image to be displayed comprises:
acquiring a plurality of grayscale data voltages respectively corresponding to a plurality of sub-pixels in the row of sub-pixels among grayscale data voltages of the frame of the image to be displayed, each of the plurality of the grayscale data voltages corresponding to a sub-pixel of the row of the sub-pixels;
obtaining a first shift value by adding the grayscale data voltages of a positive polarity among the plurality of grayscale data voltages respectively corresponding to the plurality of sub-pixels in the row of sub-pixels;
obtaining a second shift value by adding absolute values of the grayscale data voltages of a negative polarity among the plurality of grayscale data voltages respectively corresponding to the plurality of sub-pixels in the row of sub-pixels; and
obtaining the VCOM shift amplitude by subtracting the second shift value from the first shift value.

2. The display driving method according to claim 1 , wherein the display driving method further comprises, before obtaining the grayscale data voltage compensation table:
obtaining an initial grayscale data voltage compensation table, wherein the initial grayscale data voltage compensation table stores a mapping relationship between initial VCOM shift amplitudes and initial grayscale data voltage compensation values;
providing the initial grayscale data voltages to a row of sub-pixels on the display panel so that the VCOM shift amplitude corresponding to the row of the sub-pixels is an initial VCOM shift amplitude corresponding to the row of the sub-pixels;
compensating the grayscale data voltages actually inputted to the row of the sub-pixels based on an initial grayscale data voltage compensation value corresponding to the initial VCOM shift amplitude to obtain initial compensated grayscale data voltages;
outputting the initial compensated grayscale data voltages to the row of the sub-pixels;
measuring actual brightness values of the row of sub-pixels, and
adjusting the initial compensated grayscale data voltages based on a difference between the actual brightness values and preset brightness values of the row of sub-pixels to obtain the grayscale data voltage compensation value corresponding to the initial VCOM shift amplitude, thereby obtaining the grayscale data voltage compensation table;
wherein the preset brightness values are theoretical values of brightness of the row of sub-pixels when the initial grayscale data voltages are provided to the row of the sub-pixels.

3. The display driving method according to claim 1 , wherein the grayscale data voltages actually inputted to the row of sub-pixels comprise M grayscale data voltages, and each of the M grayscale data voltages corresponds to a sub-pixel in the row of the sub-pixels, and M is an integer larger than 1.

4. The display driving method according to claim 3 , wherein compensating grayscale data voltages actually inputted to the row of sub-pixels based on the grayscale data voltage compensation value to obtain compensated grayscale data voltages comprises:
controlling a grayscale data voltage actually inputted to a sub-pixel of the row of sub-pixels to be equal to a sum of an original grayscale data voltage of the sub-pixel and the grayscale data voltage compensation value.

5. A display driving apparatus comprising:
a compensation table acquirer, which is configured to acquire a grayscale data voltage compensation table, wherein the grayscale data voltage compensation table stores mapping relationship between voltages of common electrodes (VCOM) shift amplitudes and grayscale data voltage compensation values;
a calculator, which is configured to calculate a VCOM shift amplitude corresponding to a row of sub-pixels on the display panel based on grayscale data voltages of a frame of image to be displayed;
a compensation value acquirer, which is coupled to the compensation table acquirer and the calculator and configured to obtain a grayscale data voltage compensation value corresponding to the row of sub-pixels on the display panel based on the calculated VCOM shift amplitude and the grayscale data voltage compensation table;
a compensator, which is coupled to the compensation value acquirer and configured to compensate the grayscale data voltages actually inputted to the row of sub-pixels based on the grayscale data voltage compensation value to obtain compensated grayscale data voltages; and
a grayscale data voltage outputer, which is coupled to the compensator and configured to output the compensated grayscale data voltages to the row of sub-pixels during display time of the frame of image to be displayed;
wherein the calculator comprises:
a grayscale data voltage acquirer, which is configured to acquire a plurality of grayscale data voltages respectively corresponding to a plurality of sub-pixels of the row of sub-pixels among the grayscale data voltages of the frame of image to be displayed, each of the grayscale data voltages corresponding to a sub-pixel of the row of sub-pixels;
a first calculator, which is coupled to the grayscale data voltage acquirer and configured to add the grayscale data voltages of a positive polarity among the plurality of grayscale data voltages to obtain a first shift value;
a second calculator, which is coupled to the grayscale data voltage acquirer and configured to add absolute values of the grayscale data voltages of a negative polarity among the plurality of grayscale data voltages to obtain a second shift value; and
a third calculator, which is coupled to the first calculator and the second calculator and configured to subtract the second shift value from the first shift value to obtain the VCOM shift amplitude.

6. The display driving apparatus according to claim 5 , wherein the grayscale data voltages actually inputted to the row of sub-pixels comprise M grayscale data voltages, and each of the M grayscale data voltages corresponds to a sub-pixel in the row of the sub-pixels, and M is an integer larger than 1.

7. The display driving apparatus according to claim 6 , wherein the compensator is configured to control a grayscale data voltage actually inputted to a sub-pixel of the row of sub-pixels to be equal to a sum of an original grayscale data voltage of the sub-pixel and the grayscale data voltage compensation value.

8. A display assembly comprising the display driving apparatus according to claim 5 .

9. The display assembly according to claim 8 , further comprising a time controller (TCON);
wherein the compensation table acquirer, the calculator, the compensati

Assignees

• Hefei Xinsheng Optoelectronics Technology Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Chen Zejun
• Wang Jianjun
• Liu Xiaoshi
• Wang Min
• Dong Hui

Classifications

• G09G3/3614 Primary

  Control of polarity reversal in general · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G3/3688 Primary

  suitable for active matrices only · CPC title