Touch sensor for display with shield

Patent metadata

Field	Value
Publication number	US-10452201-B1
Application number	US-201815942049-A
Country	US
Kind code	B1
Filing date	Mar 30, 2018
Priority date	Mar 30, 2018
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A display device includes a display panel including a plurality of sub-pixels; a shield electrode that is made of a first conductive and opaque material, is located directly on the display panel, overlaps a portion of the display panel in between a portion of the plurality of sub-pixels, and is connected to a touch sensor controller; an insulating layer that covers the shield electrode; a touch sensor electrode that is made of a second conductive and opaque material, is located on the insulating layer, overlaps a portion of the display panel in between some of the plurality of sub-pixels, and overlaps the shield electrode; and a feedline is connected to the touch sensor electrode, overlaps a portion of the display panel in between a portion of the plurality of sub-pixels that is not overlapped by the touch sensor electrode, and routes the touch sensor electrode to the touch sensor controller.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of sub-pixels;
a shield electrode that is made of a first conductive and opaque material, is located directly on the display panel, overlaps a portion of the display panel in between a portion of the plurality of sub-pixels, and is connected to a touch sensor controller;
an insulating layer that covers the shield electrode;
a touch sensor electrode that is made of a second conductive and opaque material, is located on the insulating layer, overlaps a portion of the display panel in between some of the plurality of sub-pixels, and overlaps the shield electrode; and
a feedline that is made of the second conductive and opaque material, is connected to the touch sensor electrode, overlaps a portion of the display panel in between a portion of the plurality of sub-pixels that is not overlapped by the touch sensor electrode, and routes the touch sensor electrode to the touch sensor controller.

2. The display device of claim 1 , wherein the shield electrode, the touch sensor electrode, and the feedline overlaps only a non-emission region between the plurality of sub-pixels.

3. The display device of claim 1 , wherein the shield electrode is provided with a same voltage or substantially a same voltage as the touch sensor electrode.

4. The display device of claim 1 , wherein the shield electrode is electrically isolated from the touch sensor electrode.

5. The display device of claim 1 , wherein a width of a portion of the shield electrode that overlaps the feedline is wider than a width of the feedline.

6. The display device of claim 5 , wherein
the shield electrode includes a connecting portion connecting the portion of the shield electrode that overlaps the feedline to a portion of the shield electrode that overlaps an adjacent feedline, and
a width of the connecting portion is narrower than the width of the feedline.

7. The display device of claim 1 , wherein a pattern of the shield electrode between the feedline and an adjacent feedline is the same or substantially the same as a pattern of the touch sensor electrode.

8. The display device of claim 1 , wherein a width of a portion of the shield electrode overlapping the feedline is equal or substantially equal to a width of the feedline.

9. The display device of claim 8 , wherein
the shield electrode includes a connecting portion connecting the portion of the shield electrode that overlaps the feedline and a portion of the shield electrode that overlaps an adjacent feedline, and
a width of the connecting portion is equal to or substantially equal to the width of the feedline.

10. The display device of claim 1 , wherein the feedline includes a serpentine or zig-zag pattern in between adjacent sub-pixels of the plurality of sub-pixels.

11. The display device of claim 1 , wherein the shield electrode is wider than the touch sensor electrode adjacent to a corner of the touch sensor electrode or the feedline.

12. The display device of claim 1 , wherein a triangular shaped portion of the shield electrode extends beyond an edge of the touch sensor electrode or the feedline in an area adjacent to a corner of the touch sensor electrode or the feedline in which the shield electrode overlaps.

13. The display device of claim 1 , wherein a curved shaped portion of the shield electrode extends beyond an edge of the touch sensor electrode or the feedline in an area adjacent to a corner of the touch sensor electrode or the feedline in which the shield electrode overlaps.

14. The display device of claim 1 , wherein a distance between an edge of the touch sensor electrode and a nearest edge of one of the plurality of the sub-pixels is at least a distance which provides a direction at an angle relative to perpendicular to a front surface plane of the display device between the edge of the touch sensor electrode and the nearest edge of the sub-pixel which is equal to a maximum escape angle for light from the one of the plurality of sub-pixels.

15. The display device of claim 1 , wherein a distance between an edge of the feedline and a nearest edge of one of the plurality of the sub-pixels is at least a distance which provides a direction at an angle relative to perpendicular to a front surface plane of the display device between the edge of the touch sensor electrode and the nearest edge of the sub-pixel which is equal to a maximum escape angle for light from the one of the plurality of sub-pixels.

16. The display device of claim 1 , wherein a distance between an edge of the shield electrode and a nearest edge of one of the plurality of the sub-pixels is at least a distance which provides a direction at an angle relative to perpendicular to a front surface plane of the display device between the edge of the touch sensor electrode and the nearest edge of the sub-pixel which is equal to a maximum escape angle for light from the one of the plurality of sub-pixels.

17. The display device of claim 1 , wherein the display panel is an emissive display panel.

18. The display device of claim 1 , wherein a coverage of the first conductive and opaque material and the second conductive and opaque material of the touch sensor in a plan view of a feedline region is between about 50% and about 150% of a coverage of the first conductive and opaque material and the second conductive and opaque material of the touch sensor in a touch electrode region.

19. The display device of claim 1 , wherein the a coverage of the first conductive and opaque material and the second conductive and opaque material of the touch sensor in a plan view of a feedline region is between about 80% and about 120% of the coverage of the first conductive and opaque material and the second conductive and opaque material of the touch sensor in a touch electrode region.

20. The display device of claim 1 , wherein the feedline overlaps the shield electrode.

Assignees

• Sharp Kk

Inventors

• Clark Nick
• Smeeton Tim Michael

Classifications

• G09F9/33

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

• G06F3/044

  by capacitive means · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title