LIQUID CRYSTAL DISPLAY AND COLOR SHIFT COMPENSATION METHOD OF LIQUID CRYSTAL DISPLAY

• US 20170301298A1
• Filed: 01/06/2016
• Published: 10/19/2017
• Est. Priority Date: 12/14/2015
• 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: WANG, Mingliang
• Granted Patent: US 10,176,768 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• 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
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

The present invention discloses a liquid crystal display, including a data driving chip and a plurality of display regions, which are aligned side by side, and the data driving chip includes a digital to analog converter, and the digital to analog converter includes a plurality of voltage division modules which are individually independent, and the plurality of voltage division modules provide corresponding voltages for the plurality of display regions to achieve an identical brightness of the plurality of display regions. The present invention also discloses a color shift compensation method of a liquid crystal display. The display brightness of the liquid crystal display according to the present invention is identical.

Claims

1. A liquid crystal display, comprising a data driving chip and a plurality of display regions, which are aligned side by side, and the data driving chip comprises a digital to analog converter, and the digital to analog converter comprises a plurality of voltage division modules which are individually independent, and the plurality of voltage division modules provide corresponding voltages for the plurality of display regions to achieve an identical brightness of the plurality of display regions.

2. The liquid crystal display according to claim 1, wherein the plurality of display regions comprises a first display region in the middle of the liquid crystal display and a plurality of second display regions arranged at two sides of the first display region, and the plurality of voltage division modules comprises a first voltage division module and a plurality of second voltage division modules, and the first voltage division module provides a voltage for the first display region, and the plurality of second voltage division modules provides voltages for the plurality of second display regions one to one or one to two, and the two second display regions which commonly share the same second voltage division module are symmetric relative to the first display region.

3. The liquid crystal display according to claim 2, wherein the liquid crystal display comprises a gate driving chip located at one side of the plurality of display regions, and the plurality of second voltage division modules provides voltages for the plurality of second display regions one to one.

4. The liquid crystal display according to claim 2, wherein the liquid crystal display comprises two gate driving chips respectively located at two sides of the plurality of display regions, and the plurality of second voltage division modules provides voltages for the plurality of second display regions one to two.

5. The liquid crystal display according to claim 1, wherein both the first voltage division module and the second voltage division module comprise a resistance string which is formed with a plurality of resistance coupled in series, and the resistance string generates a plurality of voltages, and the resistance strings of the first voltage division module and the second voltage division module are different.

6. The liquid crystal display according to claim 1, wherein the data driving chip further comprises a logic control module and an output power amplifying module, and the logic control module is employed to output a digital signal to the digital to analog converter, and the digital to analog converter converts the digital signal into a voltage signal, and then inputs the same into the output power amplifying module, and the output power amplifying module amplifies the voltage signal, and outputs the voltage to the plurality of display regions for driving the plurality of display regions to display.

7. A color shift compensation method of a liquid crystal display, wherein the color shift compensation method of the liquid crystal display comprises steps of:

dividing the liquid crystal display into a plurality of display regions;

providing a voltage corresponding to a first gray scale for the plurality of display regions with a first voltage division module;

respectively measuring brightnesses of the plurality of display regions, and determining actual voltages of the plurality of display regions;

the plurality of display regions comprises a first display region and a plurality of second display regions;

respectively providing compensation voltages for the plurality of second display regions to obtain correction voltages of the plurality of second display regions corresponding to the first gray scale, and the compensation voltages are differences between the actual voltage of the first display region and the actual voltage of the second display regions;

repeating the aforesaid steps to obtain correction voltages of the plurality of second display regions corresponding to other gray scales except the first gray scale;

providing a voltage for the first display region with the first voltage division module, and providing the correction voltages for the plurality of second display regions with the plurality of second voltage division modules to make a display brightness of the liquid crystal display identical.

8. The color shift compensation method of the liquid crystal display according to claim 7, wherein after measuring the brightnesses of the plurality of display regions, the method comprises:

finding the actual voltages corresponding to the brightnesses according to a voltage-transmission (V-T) curve of liquid crystal.

9. The color shift compensation method of the liquid crystal display according to claim 8, wherein the first display region is in the middle of the liquid crystal display, and the plurality of second display regions arranged at two sides of the first display region.

10. The color shift compensation method of the liquid crystal display according to claim 9, wherein the liquid crystal display comprises a gate driving chip located at one side of the plurality of display regions, and the plurality of second voltage division modules provides voltages for the plurality of second display regions one to one.

11. The color shift compensation method of the liquid crystal display according to claim 9, wherein the liquid crystal display comprises two gate driving chips respectively located at two sides of the plurality of display regions, and the plurality of second voltage division modules provides voltages for the plurality of second display regions one to two, and the two second display regions which commonly share the same second voltage division module are symmetric relative to the first display region.

12. The color shift compensation method of the liquid crystal display according to claim 7, wherein both the first voltage division module and the second voltage division module comprise a resistance string which is formed with a plurality of resistance coupled in series, and the resistance string generates a plurality of voltages, and the resistance strings of the first voltage division module and the second voltage division module are different.