Method, system and computer readable storage medium for driving liquid crystal displays

• US 10,446,089 B2
• Filed: 10/31/2017
• Issued: 10/15/2019
• Est. Priority Date: 09/26/2017
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Zha, Guowei
• Primary Examiner(s): Tzeng, Fred
• Application Number:
  US15/578,320
• Publication Number:
  US 20190114973A1
• Time in Patent Office: Days
• Field of Search: 345691
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2025 the sub-frames having all the same time duration
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127

Abstract

A method for driving the liquid crystal display comprises dividing a screen of the liquid crystal display into multiple displaying regions, and performing a divisional driving thereto, setting a backlight parameter corresponding to each the displaying region to a first backlight parameter during a first half of a time period of one frame, wherein the first backlight parameter is smaller than or equal to a maximum backlight parameter, setting the backlight parameter to a second backlight parameter during a second half of the time period, wherein the second parameter is smaller than a first threshold value, to have a default frame inserted during the second half of the time period of the one frame, and a difference between a gray level of the default frame and a gray level of a full black frame is within a predetermined range. The technical solution can improve blurred pictures.

Claims

1. A method for driving a liquid crystal display, comprising:

dividing a screen of the liquid crystal display into multiple displaying regions, and performing a divisional driving to the multiple displaying regions;

setting a backlight parameter corresponding to each the displaying region of the liquid crystal display to a first backlight parameter during a first half of a time period of one frame displayed by the liquid crystal display, wherein the first backlight parameter is smaller than or equal to a maximum backlight parameter of the each displaying region of the liquid crystal display; and

setting the backlight parameter corresponding to each the displaying region of the liquid crystal display to a second backlight parameter during a second half of the time period of the one frame displayed by the liquid crystal display, the second parameter is smaller than a first threshold value, to have a default frame inserted during the second half of the time period of the one frame displayed by the liquid crystal display, and a difference between a gray level of the default frame and a gray level of a full black frame is within a predetermined range.

2. The method for driving a liquid crystal display according to claim 1, wherein the step of setting the backlight parameter corresponding to each the displaying region of the liquid crystal display to the first backlight parameter, further comprises:

counting a distribution situation of a gray level of each the displaying region of the liquid crystal display, and determining the backlight parameter corresponding to each the displaying region of the liquid crystal display according to the distribution situation of the gray level of each the displaying region.

3. The method for driving a liquid crystal display according to claim 2, wherein the backlight parameter corresponding to each the displaying region of the liquid crystal display is determined according to a maximum gray level, a minimum gray level, an average gray level and a most distributed gray level of each the displaying region.

4. The method for driving a liquid crystal display according to claim 1, further comprising:

performing a brightness compensation to each the gray level of the liquid crystal display, according to the backlight parameter corresponding to each the displaying region of the liquid crystal display and a brightness of each pixel of the liquid crystal display at the backlight parameter.

5. The method for driving a liquid crystal display according to claim 4, wherein the step of performing the brightness compensation to each the gray level of the liquid crystal display according to the backlight parameter corresponding to each the displaying region of the liquid crystal display and the brightness of each pixel of the liquid crystal display at the backlight parameter, further comprises:

calculating B2 according to an equation of A1*B1=A2*B2, wherein the A1 is the brightness of each the pixel at a full backlight of the liquid crystal display, the B1 is a normalized brightness of each the pixel at the full backlight of the liquid crystal display, the A2 is the brightness of each the pixel at the backlight parameter of the liquid crystal display, the B2 is the normalized brightness of each the pixel at the backlight parameter of the liquid crystal display, wherein the B1 is obtained according to the distribution situation of the gray level of each the displaying region at the full backlight of the liquid crystal display; and

wherein, the method for driving the liquid crystal display further comprises;

obtaining the gray level of each the pixel of the liquid crystal display at the backlight parameter according to the B2, and driving the liquid crystal display according to the gray level of each the pixel of the liquid crystal display at the backlight parameter.

6. A system for driving a liquid crystal display, comprising:

a dividing module, for dividing a screen of the liquid crystal display into multiple displaying regions, and performing a divisional driving to the multiple displaying regions;

a first setting module, for setting a backlight parameter of each displaying region of the liquid crystal display to a first backlight parameter, during a first half of a time period of one frame displayed by the liquid crystal display, wherein the first backlight parameter is smaller than or equal to a maximum backlight parameter of the each displaying region of the liquid crystal display; and

a second setting module, for setting the backlight parameter corresponding to each the displaying region of the liquid crystal display to a second backlight parameter, during a second half of the time period of the one frame displayed by the liquid crystal display, wherein the second parameter is smaller than a first threshold value, to have a default frame inserted during the second half of the time period of the one frame displayed by the liquid crystal display, and a difference between a gray level of the default frame and a gray level of a full black frame is within a predetermined range.

7. The system for driving a liquid crystal display according to claim 6, wherein the first setting module comprises:

a first counting module, for counting a distribution situation of the gray level of each the displaying region of the liquid crystal display; and

a first determining module, for determining the backlight parameter corresponding to each the displaying region according to the distribution situation of the gray level of each the displaying region of the liquid crystal display.

8. The system for driving a liquid crystal display according to claim 7, wherein the first determining module determines the backlight parameter corresponding to each the displaying region, according to a maximum gray level, a minimum gray level, an average gray level and a most distributed gray level of each the displaying region.

9. The system for driving the liquid crystal display according to claim 6, further comprising:

a compensation module, performing a brightness compensation to each the gray level of the liquid crystal display, according to the backlight parameter corresponding to each the displaying region of the liquid crystal display and a brightness of each pixel of the liquid crystal display at the backlight parameter.

10. The system for driving a liquid crystal display according to claim 9, wherein the compensation module, for performing the brightness compensation to each the gray level of the liquid crystal display, according to the backlight parameter corresponding to each the displaying region of the liquid crystal display and the brightness of each pixel of the liquid crystal display at the backlight parameter, further comprises:

calculating B2 according to an equation of A1*B1=A2*B2, wherein, the A1 is the brightness of each the pixel at a full backlight of the liquid crystal display, the B1 is a normalized brightness of each the pixel at the full backlight of the liquid crystal display, the A2 is the brightness of each the pixel at the backlight parameter of the liquid crystal display, the B2 is the normalized brightness of each the pixel at the backlight parameter of the liquid crystal display, wherein the B1 is obtained according to the distribution situation of the gray level of each the displaying region at the full backlight of the liquid crystal display; and

wherein, the system for driving the liquid crystal display further comprises;

obtaining the gray level of each the pixel of the liquid crystal display at the backlight parameter according to the B2, and driving the liquid crystal display according to the gray level of each the pixel of the liquid crystal display at the backlight parameter.

11. A computer readable non-transitory storage medium with a program for driving the liquid crystal display stored therein, wherein the program is executed to perform the steps comprising:

dividing a screen of the liquid crystal display into multiple displaying regions, and performing a divisional driving to the multiple displaying regions;

setting a backlight parameter corresponding to each the displaying region of the liquid crystal display to a first backlight parameter during a first half of a time period of one frame displayed by the liquid crystal display, wherein the first backlight parameter is smaller than or equal to a maximum backlight parameter of the each displaying region of the liquid crystal display; and

setting the backlight parameter corresponding to each the displaying region of the liquid crystal display to a second backlight parameter during a second half of the time period of the one frame displayed by the liquid crystal display, the second parameter is smaller than a first threshold value, to have a default frame inserted during the second half of the time period of the one frame displayed by the liquid crystal display, and a difference between a gray level of the default frame and a gray level of a full black frame is within a predetermined range.

12. The computer readable non-transitory storage medium according to claim 11, wherein the step of setting the backlight parameter corresponding to each the displaying region of the liquid crystal display to the first backlight parameter, further comprises:

counting a distribution situation of a gray level of each the displaying region of the liquid crystal display, and determining the backlight parameter corresponding to each the displaying region of the liquid crystal display according to the distribution situation of the gray level of each the displaying region.

13. The computer readable non-transitory storage medium according to claim 12, wherein the backlight parameter corresponding to each the displaying region of the liquid crystal display is determined according to a maximum gray level, a minimum gray level, an average gray level and a most distributed gray level of each the displaying region.

14. The computer readable non-transitory storage medium according to claim 11, wherein the program is executed to perform the steps further comprising:

performing a brightness compensation to each the gray level of the liquid crystal display, according to the backlight parameter corresponding to each the displaying region of the liquid crystal display and a brightness of each pixel of the liquid crystal display at the backlight parameter.

15. The computer readable non-transitory storage medium according to claim 14, wherein the step of performing the brightness compensation to each the gray level of the liquid crystal display, according to the backlight parameter corresponding to each the displaying region of the liquid crystal display and the brightness of each pixel of the liquid crystal display at the backlight parameter, further comprises:

calculating B2 according to an equation of A1*B1=A2*B2, wherein, the A1 is the brightness of each the pixel at a full backlight of the liquid crystal display, the B1 is a normalized brightness of each the pixel at the full backlight of the liquid crystal display, the A2 is the brightness of each the pixel at the backlight parameter of the liquid crystal display, the B2 is the normalized brightness of each the pixel at the backlight parameter of the liquid crystal display, wherein the B1 is obtained according to the distribution situation of the gray level of each the displaying region at the full backlight of the liquid crystal display; and

wherein, the method for driving the liquid crystal display further comprises;

obtaining the gray level of each the pixel of the liquid crystal display at the backlight parameter according to the B2, and driving the liquid crystal display according to the gray level of each the pixel of the liquid crystal display at the backlight parameter.