Method, device and system for determining actual option common voltage of display panel

Patent metadata

Field	Value
Publication number	US-2021350761-A1
Application number	US-201817271580-A
Country	US
Kind code	A1
Filing date	Dec 4, 2018
Priority date	Nov 13, 2018
Publication date	Nov 11, 2021
Grant date	—

Abstract

The present application provides a method, a device and a system for determining an actual option common voltage of a display panel. The method for determining the actual option common voltage of the display panel includes the following steps: acquiring a first common voltage and a second common voltage for fitting a curve; acquiring a first flicker corresponding to the first common voltage and a second flicker corresponding to the second common voltage; acquiring a first Vcom-Flicker curve according to the first common voltage and the first flicker, and acquiring a second Vcom-Flicker curve according to the second common voltage and the second flicker; and determining a common voltage at an intersection of the first Vcom-Flicker curve and the second Vcom-Flicker curve, in which the common voltage at the intersection is the actual option common voltage.

First claim

What is claimed is:

1 . A method for determining an actual option common voltage of a display panel, wherein the display panel comprises a common electrode and a plurality of pixel electrodes arranged opposite to the common electrode, the common electrode is applied with a common voltage, each of the pixel electrodes is applied with an anodic gray-scale voltage and a cathodic gray-scale voltage corresponding to the gray-scale value, and the method for determining the actual option common voltage comprises:
acquiring a first common voltage and a second common voltage for fitting a curve, wherein the first common voltage is not less than a theoretical optimal common voltage, the a second common voltage is less than the theoretical optimal common voltage, and the theoretical optimal common voltage is a mean voltage of the anodic gray-scale voltage and the cathodic gray-scale voltage; acquiring a first flicker corresponding to the first common voltage and a second flicker corresponding to the second common voltage; acquiring a first Vcom-Flicker curve according a to the first common voltage and the first flicker, and acquiring a second Vcom-Flicker curve according a to the second common voltage and the second flicker; and determining a common voltage at an intersection of the first Vcom-Flicker curve and the second Vcom-Flicker curve, wherein the common voltage at the intersection is the actual option common voltage.

2 . The method for determining the actual option common voltage of the display panel according to claim 1 , wherein, in the first Vcom-Flicker curve:
y right =a 1 ( x 1 −b 1 ) 2 +c 1 x 1 is the common voltage greater than the theoretical optimal common voltage, y right is a flicker corresponding to x 1 , a 1 and b 1 are coefficients, and c 1 is a constant.

3 . The method for determining the actual option common voltage of the display panel according to claim 1 , wherein, in the first Vcom-Flicker curve:
y right =k 1 x 1 +b 2 x 1 is a common voltage greater than the theoretical optimal common voltage, y right is a flicker corresponding to x 1 , k 1 is a coefficient, and b 2 is a constant.

4 . The method for determining the actual option common voltage of the display panel according to claim 2 , wherein, in the second Vcom-Flicker curve:
y left =a 2 ( x 2 −b 3 ) 2 +c 2 x 2 is a common voltage less than the theoretical optimal common voltage, y left is a flicker corresponding to x 2 , a 2 and b 3 are coefficients, and c 2 is a constant.

5 . The method for determining the actual option common voltage of the display panel according to claim 3 , wherein, in the second Vcom-Flicker curve:
y left =a 2 ( x 2 −b 3 ) 2 +c 2 x 2 is a common voltage less than the theoretical optimal common voltage, y left is a flicker corresponding to x 2 , a 2 and b 3 are coefficients, and c 2 is a constant.

6 . The method for determining the actual option common voltage of the display panel according to claim 2 , wherein, in the second Vcom-Flicker curve:
y left =k 2 x 2 +b 4 x 2 is a common voltage less than the theoretical optimal common voltage, y left is a flicker corresponding to x 2 , and k 2 and b 4 are parameters.

7 . The method for determining the actual option common voltage of the display panel according to claim 3 , wherein, in the second Vcom-Flicker curve:
y left =k 2 x 2 +b 4 x 2 is a common voltage less than the theoretical optimal common voltage, y left is a flicker corresponding to x 2 , and k 2 and b 4 are parameters.

8 . The method for determining the actual option common voltage of the display panel according to claim 1 , wherein the difference between the theoretical optimal common voltage and the second common voltage for fitting a curve is not less than 1V.

9 . A device for determining an actual option common voltage of a display panel, wherein the display panel comprises a common electrode and a plurality of pixel electrodes arranged opposite to the common electrode, the common electrode is applied with a common voltage, each of the pixel electrodes is applied with an anodic gray-scale voltage and a cathodic gray-scale voltage corresponding to the gray-scale value, and the device for determining the actual option common voltage comprises:
a fitting voltage data acquisition circuit configured to acquire a first common voltage and a second common voltage for fitting a curve, wherein the first common voltage is greater than a theoretical optimal common voltage, the a second common voltage is less than the theoretical optimal common voltage, and the theoretical optimal common voltage is a mean voltage of the anodic gray-scale voltage and the cathodic gray-scale voltage; a flicker acquisition circuit configured to acquire a first flicker corresponding to the first common voltage and a second flicker corresponding to the second common voltage; a Vcom-Flicker fitting circuit configured to acquire a first Vcom-Flicker curve according to the first common voltage and the first flicker, and to acquire a second Vcom-Flicker curve according to the second common voltage and the second flicker; and an actual option common voltage determining circuit configured to determine a common voltage at an intersection of the first Vcom-Flicker curve and the second Vcom-Flicker curve, wherein the common voltage at the intersection is the actual option common voltage.

10 . The device for determining the actual option common voltage of the display panel according to claim 9 , wherein, in the first Vcom-Flicker curve:
y right =a 1 ( x 1 −b 1 ) 2 +c 1 x 1 is the common voltage greater than the theoretical optimal common voltage, y right is a flicker corresponding to x 1 , a 1 and b 1 are coefficients, and c 1 is a constant.

11 . The device for determining the actual option common voltage of the display panel according to claim 9 , wherein, in the first Vcom-Flicker curve:
f right =k 1 x 1 +b 2 x 1 is a common voltage greater than the theoretical optimal common voltage, y right is a flicker corresponding to x 1 , k 1 is a coefficient, and b 2 is a constant.

12 . The device for determining the actual option common voltage of the display panel according to claim 10 , wherein, in the second Vcom-Flicker curve:
y left =a 2 ( x 2 −b 3 ) 2 +c 2 x 2 is a common voltage less than the theoretical optimal common voltage, y left is a flicker corresponding to x 2 , a 2 and b 3 are coefficients, and c 2 is a constant.

13 . The device for determining the actual option common voltage of the display panel according to claim 11 , wherein, in the second Vcom-Flicker curve:
y left =a 2 ( x 2 −b 3 ) 2 +c 2 x 2 is a common voltage less than the theoretical optimal common voltage, y left is a flicker corresponding to x 2 , a 2 and b 3 are coefficients, and c 2 is a constant.

14 . The device for determining the actual option common voltage of the display panel according to claim 10 , wherein, in the second Vcom-Flicker curve:
y left =k 2 x 2 +b 4 x 2 is a common voltage less than the theoretical optimal common voltage, y left is a flicker corresponding to x 2 , and k 2 and b 4 are parameters.

15 . The device for determining the actual option common voltage of the display panel according to claim 11 , wherein, in the second Vcom-Flicker curve:
y left =k 2 x 2 +b 4 x 2 is a common vo

Assignees

• Hkc Corp Ltd

Inventors

• Lee Chia-Hang

Classifications

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G09G3/3655

  Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G3/3696 Primary

  Generation of voltages supplied to electrode drivers · CPC title