Gamma voltage tuning method and gamma voltage tuning system

Patent metadata

Field	Value
Publication number	US-2016196793-A1
Application number	US-201314377774-A
Country	US
Kind code	A1
Filing date	Oct 25, 2013
Priority date	Jun 5, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

Provided are a Gamma voltage tuning method and a Gamma voltage tuning system. The method includes: dividing a display panel into at least two display areas; and for each divided display panel, controlling a gate driving integrated circuit to drive multiple gate lines in the display area in turn and a data driving integrated circuit to drive data lines in the display area simultaneously to lighten pixels in the display area, and performing a Gamma voltage tuning on the display area whose pixels are lightened. The display panel is divided into display areas and the tuning of Gamma voltage values is performed for each divided display area respectively; therefore the tuning of Gamma voltage for large size display panels is more accurate, which can effectively improve the uniformity of the picture display.

First claim

1 . A Gamma voltage tuning method, comprising:
dividing a display panel into at least two display areas, and performing following operations for each divided display panel: controlling a gate driving integrated circuit to drive multiple gate lines in the display area in turn, and a data driving integrated circuit to drive data lines in the display area simultaneously to lighten pixels in the display area; and performing a Gamma voltage tuning on the display area in which the pixels are lightened.

2 . The method according to claim 1 , wherein performing a Gamma voltage tuning on the display area in which the pixels are lightened comprises:
testing a picture brightness of the display area in which the pixels are lightened under different input voltages to determine a voltage-transmittance V-T curve of the display panel at the display area in which the pixels are lightened; obtaining an ideal gray scale-voltage L-V curve based on the determined voltage-transmittance V-T curve and a target gray scale-transmittance L-T curve, the target L-T curve is obtained by a curve relationship expression between gray scales and transmittances of set target Gamma values; inputting a voltage value on the ideal L-V curve corresponding to an tunable gray scale of the display panel into the display panel, testing a brightness value of the display area in which the pixels are lightened under the tunable gray scale of the display panel and dividing the brightness value by a maximum brightness to obtain an actual L-T curve of the display area in which the pixels are lightened; and tuning the voltage values corresponding to respective tunable gray scales input to the display panel by using differences between the actual L-T curve and the target L-T curve until the differences between the actual L-T curve and the target L-T curve of the display area in which the pixels are lightened is within a set error range.

3 . The method according to claim 1 , wherein the display panel is divided into the at least two display areas based on a brightness uniformity of the display panel, wherein the worse the brightness uniformity is, the more a number of the divided display areas is, and the brightness uniformity indicates a difference among the different brightness under the same gray scale.

4 . The method according to claim 1 , wherein a shape of the divided area is a square or a rectangle.

5 . The method according to claim 1 , wherein the display panel is divided into 9 display areas.

6 . A Gamma voltage tuning system, comprising an area dividing apparatus, a control system and a display panel, wherein
the area dividing apparatus is configured to divide a display panel into at least two display areas; and the control system is configured to, for the each divided display panel, control a gate driving integrated circuit of the display panel to drive multiple gate lines in the display area in turn and a data driving integrated circuit to drive data lines in the display area simultaneously to lighten pixels in the display area, and is configured to perform a Gamma voltage tuning on the display area in which the pixels are lightened.

7 . The Gamma voltage tuning system according to claim 6 , wherein the control system comprises:
a processing apparatus configured to: for the each divided display panel, control the gate driving integrated circuit to drive the multiple gate lines in the display area in turn and the data driving integrated circuit to drive the data lines in the display area simultaneously to lighten the pixels in the display area; obtain an ideal gray scale-voltage L-V curve based on a determined voltage-transmittance V-T curve and a target gray scale-transmittance L-T curve, the target L-T curve is obtained by substituting set target Gamma values into a curve relationship expression between gray scales and transmittances; input a voltage value on the ideal L-V curve corresponding to an tunable gray scale of the display panel into the display panel to obtain an actual L-T curve; tune the voltage values corresponding to the respective unable gray scales input to the display panel by using differences between the actual L-T curve and the target L-T curve until the differences between the actual L-T curve and the target L-T curve of the display area in which the pixels are lightened is within a set error range; and a testing apparatus configured to: test picture brightness of the display area in which the pixels are lightened under different input voltages; determine a voltage-transmittance V-T curve of the display panel at the display area in which the pixels are lightened; and test brightness values of the display area in which the pixels are lightened under different gray scales and dividing the brightness values by a maximum brightness to obtain the actual L-T curve of the display area in which the pixels are lightened.

8 . The Gamma voltage tuning system according to claim 6 , wherein the area dividing apparatus is configured to divide the display panel into the at least two display areas based on a brightness uniformity of the display panel, wherein the worse the brightness uniformity is, the more a number of the divided display areas is, and the brightness uniformity indicates differences among the different brightness under the same gray scale.

9 . The Gamma voltage tuning system according to claim 6 , wherein the area dividing apparatus is configured to divide the display panel into the at least two display areas having a shape of square or rectangle.

10 . The Gamma voltage tuning system according to claim 6 , wherein the area dividing apparatus is configured to divide the display panel into 9 display areas.

11 . The method according to claim 2 , wherein a shape of the divided display area is a square or a rectangle.

12 . The method according to claim 2 , wherein the display panel is divided into 9 display areas.

13 . The Gamma voltage tuning system according to claim 7 , wherein the area dividing apparatus is configured to divide the display panel into the at least two display areas having a shape of square or rectangle.

14 . The Gamma voltage tuning system according to claim 7 wherein the area dividing apparatus is configured to divide the display panel into 9 display areas.

Assignees

• Boe Technology Group Co Ltd
• Hefei Boe Optoelectronics Tech

Inventors

• Xu Xiangyang

Classifications

• G09G3/3607

  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 title

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G09G2320/0686

  with two or more screen areas displaying information with different brightness or colours · CPC title

• G09G3/3688 Primary

  suitable for active matrices only · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title