In-cell touch screen and display device

Patent metadata

Field	Value
Publication number	US-2017269746-A1
Application number	US-201615308086-A
Country	US
Kind code	A1
Filing date	Feb 6, 2016
Priority date	Sep 7, 2015
Publication date	Sep 21, 2017
Grant date	—

Abstract

There is disclosed an in-cell touch screen and a display device, including a first touch electrode and a second touch electrode staggered with the first touch electrode. The second touch electrode includes first sub-electrodes and second sub-electrodes, which are sequentially connected with each other in a first direction in an alternate and orthographic mode, and the first sub-electrodes extend in the first direction, the second sub-electrodes extend in a direction perpendicular to the first direction, and an orthographic projection of the second sub-electrode on the array substrate is located within an orthographic projection of the first touch electrode on the array substrate. Therefore, it increases the mutual capacitance between the first touch electrode and the second touch electrode per unit area and improving the sensitivity of the in-cell touch screen when being touched.

First claim

1 . An in-cell touch screen, comprising:
an array substrate and an opposite substrate arranged opposite to the array substrate; and a common electrode layer located on a side of the opposite substrate facing the array substrate or a side of the array substrate facing the opposite substrate, wherein the common electrode layer is divided into a first strip-shaped electrode and a second strip-shaped electrode, which are arranged alternately in a first direction and spaced apart from each other, and wherein the first strip-shaped electrode and/or the second strip-shaped electrode are configured to function as a first touch electrode in a touch period; wherein the in-cell touch screen further comprises a plurality of second touch electrodes, each of the second touch electrodes comprising a first sub-electrode and a second sub-electrode, which are sequentially connected with each other in the first direction in an alternate and orthographic mode, and each of the second touch electrodes being staggered with the first touch electrode; and wherein the first sub-electrodes extend in the first direction, the second sub-electrodes extend in a direction perpendicular to the first direction, and an orthographic projection of the second sub-electrode on the array substrate is located within an orthographic projection of a corresponding first touch electrode on the array substrate.

2 . The in-cell touch screen according to claim 1 , further comprising a plurality of pixel units arranged in a matrix on the array substrate;
wherein the first direction is a column direction or a row direction of the pixel units.

3 . The in-cell touch screen according to claim 2 , wherein,
the first direction is a column direction of the pixel units, in each of the second touch electrodes, two adjacent first sub-electrodes are located at two sides of a same column of pixel units, respectively, and two adjacent second sub-electrodes are located at two sides of a same row of pixel units, respectively; or the first direction is a row direction of the pixel units, in each of the second touch electrodes, two adjacent first sub-electrodes are located at two sides of at least a same row of pixel units, respectively, and two adjacent second sub-electrodes are located at two sides of a same column of pixel units, respectively.

4 . The in-cell touch screen according to claim 3 , wherein, the first direction is the column direction of the pixel units, and two adjacent first sub-electrodes in a same second touch electrode are located at two sides of a same column of pixel units, respectively.

5 . The in-cell touch screen according to claim 4 , wherein the second touch electrodes are located on the side of the array substrate facing the opposite substrate; and
the first direction is the column direction of the pixel units, and the second touch electrodes function as a data line of the associated column of pixel units in a display period.

6 . The in-cell touch screen according to claim 1 , further comprising a black matrix arranged on the side of the array substrate facing the opposite substrate or the side of the opposite substrate facing the array substrate; and
wherein an orthographic projection of the second touch electrode on the array substrate is located within an orthographic projection of the black matrix on the array substrate.

7 . The in-cell touch screen according to claim 1 , wherein
the first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode; or the first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode.

8 . A display device, comprising the in-cell touch screen according to claim 1 .

9 . The display device according to claim 8 , wherein the display device is a liquid crystal display or an organic electroluminescent display.

10 . The in-cell touch screen according to claim 2 , further comprising a black matrix arranged on the side of the array substrate facing the opposite substrate or the side of the opposite substrate facing the array substrate; and
wherein an orthographic projection of the second touch electrode on the array substrate is located within an orthographic projection of the black matrix on the array substrate.

11 . The in-cell touch screen according to claim 3 , further comprising a black matrix arranged on the side of the array substrate facing the opposite substrate or the side of the opposite substrate facing the array substrate; and
wherein an orthographic projection of the second touch electrode on the array substrate is located within an orthographic projection of the black matrix on the array substrate.

12 . The in-cell touch screen according to claim 4 , further comprising a black matrix arranged on the side of the array substrate facing the opposite substrate or the side of the opposite substrate facing the array substrate; and
wherein an orthographic projection of the second touch electrode on the array substrate is located within an orthographic projection of the black matrix on the array substrate.

13 . The in-cell touch screen according to claim 5 , further comprising a black matrix arranged on the side of the array substrate facing the opposite substrate or the side of the opposite substrate facing the array substrate; and
wherein an orthographic projection of the second touch electrode on the array substrate is located within an orthographic projection of the black matrix on the array substrate.

14 . The in-cell touch screen according to claim 2 , wherein:
the first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode; or the first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode.

15 . The in-cell touch screen according to claim 3 , wherein:
the first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode; or the first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode.

16 . The in-cell touch screen according to claim 4 , wherein:
the first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode; or the first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode.

17 . The in-cell touch screen according to claim 5 , wherein:
the first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode; or the first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode.

18 . A display device, comprising the in-cell touch screen according to claim 2 .

19 . A display device, comprising the in-cell touch screen according to claim 3 .

20 . A display device, comprising the in-cell touch screen according to claim 4 .

Assignees

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

Inventors

• He Quanhua
• Shi Lingyun
• Zhang Hao
• Xie Xiaobo
• Wang Xiurong
• Xue Zijiao

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title

• H01L27/323

  Electricity · mapped topic

• G06F3/044

  by capacitive means · CPC title

• G06F3/04184

  Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally · CPC title