Method for determining location of short-circuit point in raster device

Patent metadata

Field	Value
Publication number	US-9857612-B2
Application number	US-201414777665-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Sep 4, 2014
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A method for determining location of a short-circuit point in a raster device comprises: applying a first DC voltage signal to a common electrode layer in the raster device; applying a second DC voltage signal to only first transparent electrodes in the raster device, or a second DC voltage signal to only second transparent electrodes in the raster device, or a second DC voltage signal to both the first transparent electrodes and the second transparent electrodes in the raster device, an absolute value of a difference between a voltage value of the first DC voltage signal and a voltage value of the second DC voltage signal being not lower than a liquid crystal deflection threshold voltage value ( 501 ); acquiring grayscale values of corresponding display areas in the raster device and determining the location of the short-circuit point according to the acquired grayscale values ( 502 ). The method provides a solution for determining the location of the short-circuit point which is in contact with the first transparent electrode and the second transparent electrode simultaneously.

First claim

What is claimed is:

1. A method for determining location of a short-circuit point in a gap area between a first transparent electrode and a second transparent electrode in a raster device, comprising:
applying a first DC voltage signal to a common electrode layer in the raster device;
applying a second DC voltage signal to only first transparent electrodes in the raster device, or applying a second DC voltage signal to only second transparent electrodes in the raster device, or applying a second DC voltage signal to both the first transparent electrodes and the second transparent electrodes in the raster device; and
acquiring grayscale values of corresponding display areas in the raster device and determining the location of the short-circuit point according to the acquired grayscale values;
wherein an absolute value of a difference between a voltage value of the first DC voltage signal and a voltage value of the second DC voltage signal being not lower than a liquid crystal deflection threshold voltage value.

2. The method of claim 1 , wherein a difference between the absolute value of the difference between the voltage value of the first DC voltage signal and the voltage value of the second DC voltage signal and the liquid crystal deflection threshold voltage value is lower than a set threshold.

3. The method of claim 1 , wherein the absolute value of the difference between the voltage value of the first DC voltage signal and the voltage value of the second DC voltage signal is not lower than the liquid crystal deflection saturation voltage value.

4. The method of claim 1 , wherein the voltage value of the first DC voltage signal is equal to 0V.

5. The method of claim 1 , wherein said determining the location of the short-circuit point according to the acquired grayscale values comprises:
comparing the acquired grayscale values and a grayscale value of a standard display area and taking a coordinate location which has a grayscale value different from others as the location of the short-circuit point;
wherein the grayscale value of the standard display area is a grayscale value of the corresponding display areas when there is no short-circuit point in the raster device.

6. A method for determining location of a short-circuit point in a gap area between a first transparent electrode and a second transparent electrode in a raster device, comprising:
applying a first DC voltage signal to only first transparent electrodes in the raster device, or applying a first DC voltage signal to only second transparent electrodes in the raster device, or applying a first DC voltage signal to both the first transparent electrodes and the second transparent electrodes in the raster device; and
acquiring grayscale values of corresponding display areas in the raster device and determining the location of the short-circuit point according to the acquired grayscale values;
wherein a voltage value of the first DC voltage signal being not lower than a liquid crystal deflection threshold voltage value.

7. The method of claim 6 , before acquiring the grayscale values of the corresponding display areas in the raster device, further comprising:
applying a second DC voltage signal to a common electrode layer in the raster device,
wherein an absolute value of a difference between a voltage value of the second DC voltage signal and the voltage value of the first DC voltage signal is not lower than the liquid crystal deflection threshold voltage value.

8. The method of claim 7 , wherein a difference between the absolute value of the difference between the voltage value of the second DC voltage signal and the voltage value of the first DC voltage signal and the liquid crystal deflection threshold voltage value is lower than a set threshold.

9. The method of claim 7 , wherein the absolute value of the difference between the voltage value of the second DC voltage signal and the voltage value of the first DC voltage signal is not lower than a liquid crystal deflection saturation voltage value.

10. The method of claim 7 , wherein the voltage value of the second DC voltage signal is equal to 0V.

11. The method of claim 6 , wherein said determining the location of the short-circuit point according to the acquired grayscale values comprises:
comparing the acquired grayscale values and a grayscale value of a standard display area and taking a coordinate location which has a grayscale value different from others as the location of the short-circuit point;
wherein the grayscale value of the standard display area is a grayscale value of the corresponding display areas when there is no short-circuit point in the raster device.

12. The method of claim 2 , wherein the absolute value of the difference between the voltage value of the first DC voltage signal and the voltage value of the second DC voltage signal is not lower than the liquid crystal deflection saturation voltage value.

13. The method of claim 2 , wherein the voltage value of the first DC voltage signal is equal to 0V.

14. The method of claim 3 , wherein the voltage value of the first DC voltage signal is equal to 0V.

15. The method of claim 2 , wherein said determining the location of the short-circuit point according to the acquired grayscale values comprises:
comparing the acquired grayscale values and a grayscale value of a standard display area and taking a coordinate location which has a grayscale value different from others as the location of the short-circuit point;
wherein the grayscale value of the standard display area is a grayscale value of the corresponding display areas when there is no short-circuit point in the raster device.

16. The method of claim 3 , wherein said determining the location of the short-circuit point according to the acquired grayscale values comprises:
comparing the acquired grayscale values and a grayscale value of a standard display area and taking a coordinate location which has a grayscale value different from others as the location of the short-circuit point;
wherein the grayscale value of the standard display area is a grayscale value of the corresponding display areas when there is no short-circuit point in the raster device.

17. The method of claim 4 , wherein said determining the location of the short-circuit point according to the acquired grayscale values comprises:
comparing the acquired grayscale values and a grayscale value of a standard display area and taking a coordinate location which has a grayscale value different from others as the location of the short-circuit point;
wherein the grayscale value of the standard display area is a grayscale value of the corresponding display areas when there is no short-circuit point in the raster device.

18. The method of claim 8 , wherein the absolute value of the difference between the voltage value of the second DC voltage signal and the voltage value of the first DC voltage signal is not lower than a liquid crystal deflection saturation voltage value.

19. The method of claim 8 , wherein the voltage value of the second DC voltage signal is equal to 0V.

20. The method of claim 9 , wherein the voltage value of the second DC voltage signal is equal to 0V.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wu Yanbing

Classifications

• G02F1/134363

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title

• G02F2201/124

  interdigital · CPC title

• G02F1/1309 Primary

  Repairing; Testing · CPC title

• G02F2203/69

  Arrangements or methods for testing or calibrating a device · CPC title

• G01R31/025

  Physics · mapped topic