DEVICES AND METHODS FOR REDUCING OR ELIMINATING MURA ARTIFACT

• US 20150206493A1
• Filed: 01/21/2014
• Published: 07/23/2015
• Est. Priority Date: 01/21/2014
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Yu, Cheng-Ho, Chang, Ting-Kuo, Jamshidi-Roudbari, Abbas, Chang, Shih Chang
• Application Number:
  US14/160,230
• Publication Number:
  US 20150206493A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

Devices and methods for reducing or eliminating image artifacts are provided. By way of example, a display panel includes row common voltage (VCOM) electrodes each having a first width. The row VCOM electrodes extend along a first direction of the display panel. The display panel also includes column VCOM electrodes each having a second width. The column VCOM electrodes extend along a second direction of the display panel perpendicular to the first direction. The second width of the column VCOM electrodes may be substantially less than the first width of the row VCOM electrodes to increase a resistance of the column VCOM electrodes. By increasing the resistance of the column VCOM electrodes, image artifacts on the display panel may be prevented or eliminated.

Claims

1. A display panel, comprising:

a plurality of row common voltage (VCOM) electrodes each configured with a first width, wherein the plurality of row VCOM electrodes extends along a first direction of the display panel; and

a plurality of column VCOM electrodes each configured with a second width, wherein the plurality of column VCOM electrodes extends along a second direction of the display panel perpendicular to the first direction;

wherein the second width of the plurality of column VCOM electrodes is substantially less than the first width of the plurality of row VCOM electrodes to increase a resistance of the plurality of column VCOM electrodes in relation to a resistance of the plurality of row VCOM electrodes that would occur if the second width were the same as the first width, and wherein increasing the resistance of the plurality of column VCOM electrodes comprises substantially preventing or otherwise reducing an occurrence of an image artifact on the display panel.

2. The display panel of claim 1, wherein the first width comprises a width equal to or greater than approximately 4 microns (μ

m).

3. The display panel of claim 1, wherein the second width comprises a width equal to or less than approximately 3 microns (μ

m).

4. The display panel of claim 1, wherein the plurality of row VCOM electrodes and the plurality of column VCOM electrodes comprise a metal mesh material.

5. The display panel of claim 1, wherein the row VCOM electrodes comprise touch drive electrodes and the column VCOM electrodes comprise touch sense electrodes.

6. The display panel of claim 1, wherein a value of the resistance of the plurality of column VCOM electrodes is increased to substantially a value of a resistance of the plurality of row VCOM electrodes to prevent the occurrence of the image artifact on the display panel.

7. The display panel of claim 1, wherein at least one of the plurality of column VCOMs comprises a discontinuance configured to substantially separate a first portion and a second portion of the at least one of the plurality of column VCOMs.

8. The display panel of claim 1, wherein a ratio between the first width and the second width comprises a ratio within a range from approximately 1.5:

1 to approximately 2;

1.

9. The display panel of claim 1, wherein a ratio between the first width and the second width comprises a ratio within a range from approximately 2:

1 to approximately 3;

2.

10. The display panel of claim 1, wherein a ratio between the first width and the second width comprises a ratio within a range from approximately 3:

2 to approximately 4;

3.

11. The display panel of claim 1, wherein the image artifact comprises a vertical stripe feature of merit (VSFOM).

12. A method for fabricating an electronic display, comprising:

providing a plurality of pixel electrodes configured to store image data; and

providing a plurality of row common voltage (VCOM) electrodes and a plurality of column VCOM electrodes, wherein the plurality of row VCOM electrodes and the plurality of column VCOM electrodes are configured to receive a common voltage signal and wherein the plurality of column VCOM electrodes comprises a decreased physical width with respect to the plurality of row VCOM electrodes to increase a resistance of the plurality of column VCOM electrodes with respect to a resistance that would otherwise occur if the row and column VCOM electrodes had the same width, and wherein the increased resistance of the plurality of column VCOM electrodes reduces or eliminates an occurrence of a mura artifact on the electronic display.

13. The method of claim 12, comprising providing a metal mesh material to construct each of the plurality of row VCOM electrodes and the plurality of column VCOM electrodes.

14. The method of claim 12, wherein providing the plurality of row VCOM electrodes comprises providing a plurality of VCOM electrodes including a physical width of approximately 4-5 microns (μ

m), and wherein providing the plurality of column VCOM electrodes comprises providing a plurality of VCOM electrodes including a physical width of approximately 3 microns (μ

m).

15. The method of claim 12, wherein the increased resistance of the plurality of column VCOM electrodes is substantially equal to a resistance of the plurality of row VCOM electrodes.

16. A method for fabricating an electronic display, comprising:

providing a plurality of pixel electrodes configured to receive an image data signal; and

providing a plurality of row common voltage (VCOM) electrodes and a plurality of column VCOM electrodes, wherein the plurality of row VCOM electrodes and the plurality of column VCOM electrodes are configured to receive a common voltage signal;

wherein the plurality of column VCOM electrodes comprises a discontinuance with respect to at least one of the plurality of column VCOM electrodes to increase a resistance of the plurality of column VCOM electrodes, wherein the discontinuance is configured to reduce or substantially eliminate an occurrence of mura artifacts on the electronic display.

17. The method of claim 16, wherein providing the plurality of column VCOM electrodes including the discontinuance with respect to the at least one of the plurality of column VCOM electrodes comprises providing a floating electrode to increase the resistance of the plurality of column VCOM electrodes.

18. The method of claim 16, wherein providing the plurality of column VCOM electrodes comprises providing a second discontinuance with respect to the at least one of the plurality of column VCOM electrodes.

19. The method of claim 18, wherein providing the plurality of column VCOM electrodes comprises providing a third discontinuance with respect to at least a second one of the plurality of column VCOM electrodes.

20. The method of claim 16, wherein providing the plurality of column VCOM electrodes comprises providing a plurality of discontinuances with respect to each of the plurality of column VCOM electrodes.

21. The method of claim 16, comprising providing a metal mesh material to fabricate each of the plurality of row VCOM electrodes and the plurality of column VCOM electrodes.

22. The method of claim 16, comprising providing a decreased physical width of the at least one of the plurality of column VCOM electrodes with respect to a physical width of at least one of the plurality of row VCOM electrodes to increase the resistance of the plurality column VCOM electrodes.

23. An electronic display panel, comprising:

a plurality of row common voltage (VCOM) electrodes, wherein the row VCOM electrodes extend along a first direction of the display panel; and

a plurality of column VCOM electrodes, wherein the column VCOM electrodes extend along a second direction of the display panel perpendicular to the first direction, wherein at least one of the plurality of column VCOM electrodes comprises one or more breaches configured to increase a resistance of the plurality of column VCOM electrodes.

24. The electronic display panel of claim 23, wherein the plurality of row VCOM electrodes does not comprise the one or more breaches.

25. The electronic display panel of claim 23, wherein each of the plurality of column VCOM electrodes comprises at least one breach.

26. The electronic display panel of claim 23, wherein the one or more breaches are configured to increase the resistance of the plurality of column VCOM electrodes to substantially eliminate or reduce an occurrence of an image artifact on the electronic display panel.