Touch sensor for display

Patent metadata

Field	Value
Publication number	US-10845902-B2
Application number	US-201815942060-A
Country	US
Kind code	B2
Filing date	Mar 30, 2018
Priority date	Mar 30, 2018
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A display device includes a display panel including a plurality of sub-pixels, a touch sensor electrode made of a conductive and opaque material that is located directly on the display panel and overlaps a portion of the display panel in between a portion of the plurality of sub-pixels, a feedline that is made of the conductive and opaque material and 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 a touch sensor controller, and a feedline extension that is made of the conductive and opaque material, extends from the feedline and 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 the feedline.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of sub-pixels;
a plurality of touch sensor electrodes that are made of a conductive and opaque material that is located directly on the display panel and overlaps a portion of the display panel in between a portion of the plurality of sub-pixels, the plurality of touch sensor electrodes being routed to a touch sensor controller;
an enhancement electrode that is made of the conductive and opaque material, connected to the touch sensor controller and driven at a reference voltage, and overlaps a portion of the display panel in between a portion of the plurality of sub-pixels that is not overlapped by the plurality of touch sensor electrodes;
a first feedline that is made of the conductive and opaque material that is connected to the plurality of touch sensor electrodes, overlaps a portion of the display panel in between a portion of the plurality of sub-pixels that is not overlapped by the plurality of touch sensor electrodes and the enhancement electrode, and routes the plurality of touch sensor electrodes to the touch sensor controller; and
a second feedline that is made of the conductive and opaque material that is connected to the enhancement electrode, overlaps a portion of the display panel in between a portion of the plurality of sub-pixels that is not overlapped by the plurality of touch sensor electrodes, the enhancement electrode, and the first feedline, and routes the enhancement electrode to the touch sensor controller, wherein
a total distance between adjacent touch sensor electrodes of the plurality of touch sensor electrodes is predetermined such that the adjacent touch sensor electrodes are capable of being simultaneously sensed when the enhancement electrode is driven.

2. The display device of claim 1 , wherein the enhancement electrode increases an electric field projected from the plurality of touch sensor electrodes.

3. The display device of claim 1 , wherein the plurality of touch sensor electrodes, the enhancement electrode, the first feedline, and the second feedline overlap only a non-emissive region between the plurality of sub-pixels.

4. The display device of claim 1 , wherein the plurality of touch sensor electrodes, the feedline, and the touch sensor controller together measure a self-capacitance of the touch sensor electrode.

5. The display device of claim 1 , further comprising a dummy electrode made of the conductive and opaque material and overlapping a portion of the display panel in between a portion of the plurality of sub-pixels that is not overlapped by any of the plurality of touch sensor electrodes, the enhancement electrode, the first feedline, and the second feedline.

6. The display device of claim 1 , wherein a coverage of the conductive and opaque material in a region of the display panel including the feedline and the enhancement electrode is between about 50% and about 150% of a coverage of the conductive and opaque material in a region of the display panel including the plurality of touch sensor electrodes.

Assignees

• Sharp Kk

Inventors

• Clark Nick
• Smeeton Tim Michael

Classifications

• G06F3/0412 Primary

  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

• G06F3/044

  by capacitive means · 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