DRIVE METHOD AND DRIVE DEVICE OF LIQUID CRYSTAL DISPLAY

• US 20160267856A1
• Filed: 03/20/2015
• Published: 09/15/2016
• Est. Priority Date: 03/09/2015
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: CHEN, Yu-yeh, SUN, Lei, CHU, Li-wei, HE, Jhen-wei, GUO, Dongsheng, ZHU, Jiang
• Granted Patent: US 9,799,304 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 5/026 Control of mixing and/or overlay of colours in general G09G5/022 and G09G5/024 take precedence

Abstract

The present invention provides a drive method and a drive device of a liquid crystal display, and the drive method comprises: receiving an image to display; employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate a first display gray scale value and a second display gray scale value; employing the first display gray scale value and the second display gray scale value to respectively control display brightnesses of two display pixels of the same color on a liquid crystal panel, wherein the first display gray scale value is larger than the second display gray scale value. With the aforesaid arrangement, the present invention can reduce the color washout under large view angle to promote the display effect of the large view angle.

Claims

1. A drive method of a liquid crystal display, wherein the drive method comprises:

receiving an image to display;

employing original gray scale values of respective primary color components of respective image pixels of the image to display to respectively generate a first display gray scale value and a second display gray scale value;

employing the first display gray scale value and the second display gray scale value to respectively control display brightnesses of two display pixels of the same color on a liquid crystal panel, wherein the first display gray scale value is larger than the second display gray scale value;

wherein the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value comprises;

setting a sum of the display brightness corresponded with the first display gray scale value and the display brightness corresponded with the second display gray scale value as being twice of display brightness corresponded with the original display gray scale value; and

setting a ratio of the first display gray scale value and the second display gray scale value of different primary color components of the same image pixel as being different.

2. The drive method according to claim 1, wherein before the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value, the method further comprises:

implementing skin color detection to the image pixels of the image to display to determine nude pixel and non skin color pixel;

setting different skin color weights for the nude pixel and the non skin color pixel;

the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value comprises;

employing the skin color weights to set the ratio of the first display gray scale value and the second display gray scale value, to make a ratio of the first display gray scale value and the second display gray scale value of the nude pixel larger than a ratio of the first display gray scale value and the second display gray scale value of the non skin color pixel.

3. A drive method of a liquid crystal display, wherein the drive method comprises:

receiving an image to display;

employing original gray scale values of respective primary color components of respective image pixels of the image to display to respectively generate a first display gray scale value and a second display gray scale value;

employing the first display gray scale value and the second display gray scale value to respectively control display brightnesses of two display pixels of the same color on a liquid crystal panel, wherein the first display gray scale value is larger than the second display gray scale value.

4. The drive method according to claim 3, wherein before the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value, the method further comprises:

implementing skin color detection to the image pixels of the image to display to determine nude pixel and non skin color pixel;

setting different skin color weights for the nude pixel and the non skin color pixel;

the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value comprises;

employing the skin color weights to set the ratio of the first display gray scale value and the second display gray scale value, to make a ratio of the first display gray scale value and the second display gray scale value of the nude pixel larger than a ratio of the first display gray scale value and the second display gray scale value of the non skin color pixel.

5. The drive method according to claim 4, wherein the step of implementing skin color detection to the image pixels of the image to display comprises:

acquiring original gray scale values of red, green, blue, three primary colors of the respective image pixels;

the image pixels satisfying the following equation are defined to be nude pixels, and the image pixels not satisfying the following equation are defined to be non skin color pixels;

LR>

LG>

LB,

wherein LR, LG, LB respectively are the original gray scale values of the red, green, blue, three primary colors.

6. The drive method according to claim 4, wherein before the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value, the method further comprises:

implementing adjustment to the original gray scale values of the respective primary color components of the nude pixel to make that a difference between a relatively higher original gray scale value and a relatively lower original gray scale value before adjustment becomes larger after adjustment for the same nude pixel.

7. The drive method according to claim 4, wherein before the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value, the method further comprises:

implementing high frequency detection to the image pixels of the image to display to determine color differences of the respective image pixels and the adjacent image pixels;

respectively setting high frequency weights for the respective image pixels according to the color differences;

the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value comprises;

employing the high frequency weights to set the ratio of the first display gray scale value and the second display gray scale value, to make that the ratio of the first display gray scale value and the second display gray scale value is smaller as the color difference is larger.

8. The drive method according to claim 7, wherein the step of implementing high frequency detection to the image pixels of the image to display comprises:

calculating absolute differences of the original gray scale values of the respective primary color components of the respective image pixels and the adjacent image pixels, and summing the absolute differences to acquire different gray scale sum values for different adjacent image pixels;

selecting the maximum gray scale sum value in the gray scale sum values to represent the color difference.

9. The drive method according to claim 7, wherein before the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value, the method further comprises:

implementing block detection to the image pixels of the image to display to determine dimensions of color blocks where the image pixels are;

respectively setting block weights for the respective image pixels according to the dimensions of the color blocks;

the step of employing the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value comprises;

employing the block weights to set the ratio of the first display gray scale value and the second display gray scale value, to make that the ratio of the first display gray scale value and the second display gray scale value is smaller as the color blocks where the image pixels are are smaller.

10. The drive method according to claim 9, wherein the step of implementing block detection to the image pixels of the image to display comprises:

summing the skin color weights or the high frequency weights of the image pixels in predetermined areas around the respective image pixels to acquire weight sum value, and employing the weight sum value to represent the dimensions of the color blocks where the image pixels are.

11. The drive method according to claim 10, wherein the color skin weight of the nude pixel is larger than the color skin weight of the non skin color pixel, and the high frequency weight is smaller as the color difference is larger;

the step of employing the high frequency weights to set the ratio of the first display gray scale value and the second display gray scale value comprises;

the ratio of the first display gray scale value and the second display gray scale value is smaller as the weight sum value is smaller.

12. A drive device of a liquid crystal display, comprising:

a receiving module, receiving an image to display;

a color washout compensation module, employing original gray scale values of respective primary color components of respective image pixels of the image to display to respectively generate a first display gray scale value and a second display gray scale value;

a drive module, employing the first display gray scale value and the second display gray scale value to respectively control display brightnesses of two display pixels of the same color on a liquid crystal panel, wherein the first display gray scale value is larger than the second display gray scale value.

13. The drive device according to claim 12, wherein the drive device further comprises a skin color detection module, and the skin color detection module is employed for implementing skin color detection to the image pixels of the image to display to determine nude pixel and non skin color pixel, and setting different skin color weights for the nude pixel and the non skin color pixel before the color washout compensation module employs the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value;

the color washout compensation module further employs the skin color weights to set the ratio of the first display gray scale value and the second display gray scale value, to make a ratio of the first display gray scale value and the second display gray scale value of the nude pixel larger than a ratio of the first display gray scale value and the second display gray scale value of the non skin color pixel.

14. The drive device according to claim 13, wherein the skin color detection module is employed to acquire original gray scale values of red, green, blue, three primary colors of the respective image pixels, and the image pixels satisfying the following equation are defined to be nude pixels, and the image pixels not satisfying the following equation are defined to be non skin color pixels:

LR>

LG>

LB,

wherein LR, LG, LB respectively are the original gray scale values of the red, green, blue, three primary colors.

15. The drive device according to claim 13, wherein the color washout compensation module is further employed for implementing adjustment to the original gray scale values of the respective primary color components of the nude pixel to make that a difference between a relatively higher original gray scale value and a relatively lower original gray scale value before adjustment becomes larger after adjustment for the same nude pixel before the color washout compensation module employs the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value.

16. The drive device according to claim 13, wherein the drive device further comprises a high frequency detection module, and the high frequency detection module is employed for implementing high frequency detection to the image pixels of the image to display to determine color differences of the respective image pixels and the adjacent image pixels before the color washout compensation module employs the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value;

the color washout compensation module employs the high frequency weights to set the ratio of the first display gray scale value and the second display gray scale value, to make that the ratio of the first display gray scale value and the second display gray scale value is smaller as the color difference is larger.

17. The drive device according to claim 16, wherein the high frequency detection module is employed for calculating absolute differences of the original gray scale values of the respective primary color components of the respective image pixels and the adjacent image pixels, and summing the absolute differences to acquire different gray scale sum values for different adjacent image pixels, and selecting the maximum gray scale sum value in the gray scale sum values to represent the color difference.

18. The drive device according to claim 16, wherein the drive device further comprises a block detection module, and the block detection module is employed for implementing block detection to the image pixels of the image to display to determine dimensions of color blocks where the image pixels are, and respectively setting block weights for the respective image pixels according to the dimensions of the color blocks before the color washout compensation module employs the original gray scale values of the respective primary color components of the respective image pixels of the image to display to respectively generate the first display gray scale value and the second display gray scale value;

the color washout compensation module employs the high frequency weights to set the ratio of the first display gray scale value and the second display gray scale value, to make that the ratio of the first display gray scale value and the second display gray scale value is smaller as the color difference is larger.

19. The drive device according to claim 18, wherein the block detection module is employed for summing the skin color weights or the high frequency weights of the image pixels in predetermined areas around the respective image pixels to acquire weight sum value, and employing the weight sum value to represent the dimensions of the color blocks where the image pixels are.

20. The drive device according to claim 19, wherein the color skin weight of the nude pixel is larger than the color skin weight of the non skin color pixel, and the high frequency weight is smaller as the color difference is larger;

the color washout compensation module is employed for making that the ratio of the first display gray scale value and the second display gray scale value is smaller as the weight sum value is smaller.