Touch sensor for display with improved viewing angle uniformity

Patent metadata

Field	Value
Publication number	US-11003287-B2
Application number	US-201815942064-A
Country	US
Kind code	B2
Filing date	Mar 30, 2018
Priority date	Mar 30, 2018
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

A display device including a display panel including a plurality of sub-pixels; and an opaque material layer of a touch sensor that is located directly on the display panel and overlaps a portion of the display panel in between some of the plurality of sub-pixels; wherein the opaque material surrounds at least one of the some of the plurality of sub-pixels and includes at least five edges around the at least one of the some of the plurality of sub-pixels.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of emissive sub-pixels covered by an encapsulation layer, each of the plurality of emissive sub-pixels including a light emitting region; and
an opaque material layer defined by an electrode of a touch sensor that is located directly on the encapsulation layer of the display panel and overlaps a portion of the display panel in between some of the light emitting regions of the plurality of emissive sub-pixels; wherein
the light emitting region of each of the plurality of emissive sub-pixels includes a material that emits light upon electron and hole recombination;
a color of light emitted by electron and hole recombination of a first group of the plurality emissive sub-pixels is different from a color of light emitted by electron and hole recombination of a second group of the plurality emissive sub-pixels;
the opaque material includes a peripheral pattern surrounding at least one of the some of the light emitting regions of the plurality of emissive sub-pixels; and
the peripheral pattern is different from a pattern of the at least one of the light emitting regions of the some of the plurality of emissive sub-pixels.

2. The display device of claim 1 , wherein the peripheral pattern is an octagon.

3. The display device of claim 2 , wherein the octagon includes parallel sides of equal length.

4. The display device of claim 1 , wherein the opaque material is electrically conductive.

5. The display device of claim 1 , wherein only a portion of the opaque material is electrically conductive and remaining portions of the opaque material are not electrically conductive.

6. The display device of claim 1 , wherein
a number of edges of the peripheral pattern is more than a number of edges of the at least one of the some of the light emitting regions of the plurality of emissive sub-pixels.

7. The display device of claim 6 , wherein
an edge of the peripheral pattern which faces to each of corners of the sub-pixel has a cut-off shape.

8. The display device of claim 6 , wherein
a distance in a plan view of the display panel between a corner of the peripheral pattern facing to each of corners of the sub-pixel located closer than a distance in a plan view of the display panel between an edge of the peripheral pattern and an edge of the sub-pixel.

9. The display device of claim 1 , wherein the encapsulation layer is located directly on the plurality of emissive sub-pixels.

10. A display device comprising:
a display panel including a plurality of emissive sub-pixels covered by an encapsulation layer, each of the plurality of emissive sub-pixels including a light emitting region; and
an opaque material defined by an electrode of a touch sensor that is located directly on the encapsulation layer of the display panel and overlaps a portion of the display panel in between some of the light emitting regions of the plurality of emissive sub-pixels; wherein
the light emitting region of each of the plurality of emissive sub-pixels includes a material that emits light upon electron and hole recombination;
a color of light emitted by electron and hole recombination of a first group of the plurality emissive sub-pixels is different from a color of light emitted by electron and hole recombination of a second group of the plurality emissive sub-pixels;
the opaque material includes a first peripheral pattern surrounding a first light emitting region of the some of the light emitting regions of the plurality of emissive sub-pixels, and a second peripheral pattern surrounding a second light emitting region of the some of the light emitting regions of the plurality of emissive sub-pixels;
the first peripheral pattern is different from a pattern of the first light emitting region;
the opaque material reduces light output of the first light emitting region more than the second light emitting region at a same output angle; and
the first light emitting region emits a different color of light than the second light emitting region.

11. The display device according to claim 10 , wherein a maximum distance measured in a plan view of the display panel between an edge of the first light emitting region and the opaque material is shorter than a maximum distance measured in a plan view of the display panel between an edge of the second light emitting region and the opaque material.

12. The display device according to claim 10 , wherein an average distance measured in a plan view of the display panel between an edge of the first light emitting region and the opaque material is shorter than an average distance measured in a plan view of the display panel between an edge of the second light emitting region and the opaque material.

13. The display device according to claim 10 , wherein
a distance measured in a plan view of the display panel between an emissive region of the first light emitting region and the opaque layer varies around the first light emitting region; and
the first peripheral pattern is different from the second peripheral pattern.

14. The display device according to claim 10 , wherein the first peripheral pattern or the second peripheral pattern is an octagon.

15. The display device according to claim 14 , wherein the octagon includes parallel sides of equal length.

16. The display device according to claim 10 , wherein the display panel is an emissive display panel.

17. The display device according to claim 10 , wherein the opaque material is electrically conductive.

18. The display device according to claim 10 , wherein only a portion of the opaque material is electrically conductive and remaining portions of the opaque material are not electrically conductive.

19. The display device according to claim 10 , wherein
a number of edges of the first peripheral pattern is more than a number of edges of the first light emitting region, and
a number of edges of the second peripheral pattern is equal to a number of edges of the second light emitting region.

20. The display device according to claim 19 , wherein
an edge of the first peripheral pattern which faces to each of corners of the first light emitting region has a cut-off shape, and
a corner of the second peripheral pattern which faces to each of corners of the second light emitting region is a rounded corner.

Assignees

• Sharp Kk

Inventors

• Clark Nick
• Smeeton Tim Michael

Classifications

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04103

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

• G09F9/33

  being semiconductor devices, e.g. diodes · CPC title

• G06F3/0443 Primary

  using a single layer of sensing electrodes · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title