Self-capacitive touch screen and display device

Patent metadata

Field	Value
Publication number	US-9542055-B2
Application number	US-201514802165-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Jan 26, 2015
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A self-capacitive touch screen and a display device are disclosed. The self-capacitive touch screen includes a first substrate and a second substrate arranged opposite to each other. A conductive layer and a plurality of first touch electrodes are provided on the first substrate. The conductive layer includes a plurality of hollow areas distributed in a matrix. The first touch electrodes are in one-to-one correspondence with the hollow areas, and orthographic projections of the first touch electrodes on the first substrate are disposed in orthographic projections of the hollow areas on the first substrate. Second touch electrodes are formed in areas, which correspond to the conductive layer, on the second substrate. The second touch electrodes and the first touch electrodes are configured for the touch-control of the touch screen in the touch process.

First claim

What is claimed is:

1. A self-capacitive touch screen, comprising a first substrate and a second substrate arranged opposite to each other, wherein
a conductive layer and a plurality of first touch electrodes are formed on the first substrate; the conductive layer includes a plurality of hollow areas distributed in a matrix; the plurality of first touch electrodes are in one-to-one correspondence with the plurality of hollow areas; an orthographic projection of each first touch electrode on the first substrate is disposed in an orthographic projection of one corresponding hollow area on the first substrate;
second touch electrodes are formed in areas, which correspond to the conductive layer, on the second substrate; and the second touch electrodes and the first touch electrodes are configured for the touch-control of the touch screen in the touch process.

2. The self-capacitive touch screen according to claim I, wherein the second touch electrode includes a plurality of touch sub-electrodes; each touch sub-electrode corresponds to the conductive layer forming one row of hollow areas;
each touch sub-electrode includes a first sub-electrode and a plurality of second sub-electrodes, and the first sub-electrode is connected the second sub-electrodes respectively; the first sub-electrode corresponds to the conductive layer between two adjacent rows of first touch electrodes; and the plurality of second sub-electrodes respectively correspond to the conductive layer between two adjacent first touch electrodes in one row of first touch electrodes.

3. The self-capacitive touch screen according to claim 2 , wherein a width of the first sub-electrode perpendicular to a row direction of the first touch electrode is equal to a spacing between two adjacent rows of first touch electrodes;
a width of the second sub-electrode perpendicular to a column direction of the first touch electrode is equal to a spacing between two adjacent first touch electrodes in one row of first touch electrodes;
a length of the first sub-electrode along the row direction of the first touch electrode is equal to a length of one row of first touch electrode; and a length of the second sub-electrode along a column direction of the first touch electrode is equal to the length of the first touch electrode along the column direction.

4. The self-capacitive touch screen according to claim 3 , wherein both the first sub-electrode and the second sub-electrodes have a grid structure; grids for forming the first sub-electrode are distributed along the row direction of the first touch electrodes; and grids for forming the second sub-electrodes are distributed along the column direction of the first touch electrode.

5. The self-capacitive touch screen according to claim 4 , wherein both the first sub-electrode and the second sub-electrodes have a rectangular grid structure;
rectangular grids for forming the first sub-electrode have a same size, and a width of the rectangular grid along the row direction of the first touch electrode is equal to a width of a pixel in the self-capacitive touch screen along the row direction of the first touch electrode; and
rectangular grids for forming the second sub-electrodes have a same size, and a width of the rectangular grid along the column direction of the first touch electrode is equal to a length of a pixel in the self-capacitive touch screen along the column direction of the first touch electrode.

6. The self-capacitive touch screen according to claim 5 , wherein both the first sub-electrode and the second sub-electrode are made of a transparent conductive material or a metallic conductive material.

7. The self-capacitive touch screen according to claim 6 , wherein a black matrix is formed on the second substrate in areas corresponding to the first sub-electrode and the second sub-electrodes; and orthographic projections of the first sub-electrode and the second sub-electrodes on the second substrate are disposed in orthographic projection of the black matrix on the second substrate.

8. The self-capacitive touch screen according to claim 2 , further comprising a touch drive element, wherein each touch sub-electrode is connected to the touch drive element through a first lead; each first touch electrode is connected to the touch drive element through a second lead; and
the touch drive element is configured to input a touch drive signal into the first touch electrode and the touch sub-electrode in the touch process and determine the touch position by detection of capacitance variation of the first touch electrode and the touch sub-electrode.

9. The self-capacitive touch screen according to claim 1 , further comprising a display drive element, wherein the first touch electrode and the conductive layer are respectively connected with the display drive element which is configured to input a common voltage signal into the first touch electrode and the conductive layer during a display process.

10. A display device, comprising the self-capacitive touch screen according to claim 1 .

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Optoelectronics Tech Co Ltd

Inventors

• Yang Shengji
• Dong Xue
• Wang Haisheng
• Zhao Weijie
• Liu Yingming

Classifications

• G06F3/044 Primary

  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

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04111

  Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate · CPC title