Touchscreen edge correction

Patent metadata

Field	Value
Publication number	US-11093079-B2
Application number	US-202016942107-A
Country	US
Kind code	B2
Filing date	Jul 29, 2020
Priority date	Jul 19, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Various configurations and arrangements for touchscreens are disclosed to accommodate for one or more optical discontinuities that can be present within these touchscreens. When the one or more optical discontinuities are present, these configurations and arrangements of the touchscreens present a single layer of transparent conductive material that can be difficult to perceive by a human eye when viewing the touchscreens. Additionally, various edge correction techniques are disclosed to adjust mutual capacitances along a perimeter of the touchscreens. These edge correction techniques adjust mutual capacitances such that the values of the mutual capacitances are substantially uniform throughout.

First claim

What is claimed is:

1. A touchscreen, comprising:
a transparent substrate; and
electrode patterns disposed on the transparent substrate, the electrode patterns including a first electrode including a first electrode terminus,
a second electrode having a first edge adjacent to at least the first electrode terminus of the first electrode, wherein the first edge of the second electrode includes a first conductive extension configured to adjust a first edge mutual capacitance between the first electrode terminus and the second electrode,
wherein an increase in a size of the first conductive extension, results in a corresponding increase in the first edge mutual capacitance.

2. The touchscreen of claim 1 , wherein a second edge of the second electrode includes a second conductive extension configured to adjust a second edge mutual capacitance between the first electrode and the second electrode, wherein the size of the first conductive extension and a size of the second conductive extension are different.

3. The touchscreen of claim 1 , wherein a second edge of the second electrode includes a second conductive extension configured to adjust a second edge mutual capacitance between the first electrode and the second electrode, wherein a length of the first conductive extension and a length of the second conductive extension are different.

4. The touchscreen of claim 1 , further comprising: a third electrode with a third electrode terminus, wherein the second electrode comprises a second electrode terminus, wherein the second electrode terminus is adjacent to the third electrode terminus, and wherein the second electrode terminus comprises a second conductive extension configured to adjust a first corner mutual capacitance between the second electrode terminus and the third electrode terminus.

5. The touchscreen of claim 4 , further comprising: a fourth electrode with a fourth electrode terminus, wherein the second electrode comprises a fifth electrode terminus on an opposite edge of the touchscreen than the second electrode terminus, wherein the fifth electrode terminus is adjacent to the fourth electrode terminus, and wherein the fifth electrode terminus comprises a third conductive extension configured to adjust a second corner mutual capacitance between the fifth electrode terminus and the fourth electrode terminus.

6. The touchscreen of claim 5 , wherein the second and the third conductive extensions are different lengths.

7. The touchscreen of claim 5 , wherein the second and the third conductive extensions are different sizes.

8. The touchscreen of claim 1 , wherein the first electrode further comprises an electrode pad adjacent to the first electrode terminus, the touchscreen further comprises:
a first floating island located between the second electrode and the first electrode terminus; and
a second floating island located between the second electrode and the electrode pad.

9. The touchscreen of claim 8 , wherein the first floating island has a greater width than the second floating island.

10. The touchscreen of claim 8 , wherein a width of the first floating island is configured to reduce the first edge mutual capacitance between the first electrode and the second electrode.

11. A touchscreen, comprising:
a transparent substrate; and
electrode patterns disposed on the transparent substrate, the electrode patterns including a first electrode including a first electrode terminus,
a second electrode adjacent to at least the electrode terminus of the first electrode,
wherein the first electrode terminus includes a first geometric area configured to adjust a first edge mutual capacitance between the first electrode and the second electrode,
wherein a reduction of the first geometric area results in a corresponding reduction in the edge mutual capacitance.

12. The touchscreen of claim 11 , wherein the reduction of the first geometric area comprises a reduction of a perimeter length proximate to the second electrode.

13. The touchscreen of claim 11 , further comprising:
a third electrode including a third electrode terminus with a second geometric area configured to adjust a second edge mutual capacitance between the third electrode and the second electrode independent of the first edge mutual capacitance.

14. The touchscreen of claim 13 , wherein the second geometric area comprises a different perimeter length proximate to the second electrode than the first geometric area.

15. The touchscreen of claim 13 , wherein the second geometric area comprises a different geometric shape than the first geometric area.

16. The touchscreen of claim 11 , wherein the first electrode comprises a second electrode terminus on another side of the touchscreen with a second geometric area, wherein the second electrode terminus is adjacent to a third electrode, wherein a reduction of the second geometric area results in a corresponding reduction in a second edge mutual capacitance between the first electrode and the third electrode.

17. The touchscreen of claim 16 , wherein the second geometric area comprises a different perimeter length proximate to the third electrode than a perimeter length between the first geometric area and the second electrode.

18. The touchscreen of claim 16 , wherein the second geometric area comprises a different geometric shape than the first geometric area.

19. A touchscreen, comprising:
a transparent substrate; and
electrode patterns disposed on the transparent substrate, the electrode patterns including a first electrode including a first electrode terminus,
a second electrode adjacent to at least the electrode terminus of the first electrode,
wherein the first electrode terminus includes a first geometric area configured to adjust an edge mutual capacitance between the first electrode and the second electrode,
wherein a reduction of the first geometric area results in a corresponding reduction in the edge mutual capacitance.

20. The touchscreen of claim 19 , wherein the electrode patterns are disposed on the transparent substrate using a fabrication process having an etch resolution.

Assignees

• Elo Touch Solutions Inc

Inventors

• Kent Joel
• Ali Gazi
• Azim Khalid

Classifications

• G06F3/0448

  Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G06F3/04166 Primary

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title

• G06F3/044

  by capacitive means · CPC title