In-cell touch screen and display apparatus

• US 9,965,111 B2
• Filed: 03/27/2014
• Issued: 05/08/2018
• Est. Priority Date: 02/08/2014
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Wang, Xinxing
• Primary Examiner(s): Chatly, Amit
• Application Number:
  US14/435,344
• Publication Number:
  US 20160011688A1
• Time in Patent Office: 1,503 Days
• Field of Search: 345173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 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 Class Codes: G06F 2203/04112 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 Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Abstract

Disclosed are an In-Cell touch screen and a display apparatus, the In-Cell touch screen comprising: an array substrate; an opposed substrate arranged to be opposed to the array substrate; a conductive black matrix provided on one side of the array substrate facing the opposed substrate or on one side of the opposed substrate facing the array substrate. The black matrix comprises a plurality of first touch electrodes and a plurality of second touch electrodes arranged to be insulated from each other and alternate with each other, one of the first touch electrode and the second touch electrode is applied with a touch scan signal, and the other one of the first touch electrode and second touch electrode is coupled with the touch scan signal and outputs a touch sensing signal. No separate touch electrode made of ITO material is required, and a pattern of the black matrix is provided in a non-opening region of the pixels, thus the light transmittance of the display apparatus can be prevented from being adversely affected by the touch electrode. Further, a mutual capacitance in a thickness direction of the touch screen is avoided, thus the touch sensitivity of the In-Cell touch screen can be improved.

Claims

1. An In-Cell touch screen, comprising:

an array substrate, a plurality of pixel units arranged in an array being provided on the array substrate, the array substrate comprising;

a substrate;

a film provided on the substrate;

a conductive black matrix provided on the film;

a plurality of pixel units arranged in an array

a plurality of gate lines extending in the row direction of pixel units; and

a plurality of data lines extending in the column direction of pixel units;

an opposed substrate arranged to be opposed to the array substrate;

wherein, the black matrix comprises a plurality of first touch electrodes and a plurality of second touch electrodes arranged to be insulated from each other and alternate with each other, one of the first touch electrode and the second touch electrode is applied with a touch scan signal, and the other of the first touch electrode and the second touch electrode is coupled with the touch scan signal and outputs a touch sensing signal;

the black matrix itself serves as the first touch electrode and the second touch electrode; and

the plurality of first touch electrodes are arranged in a row direction of pixel units, and the plurality of second touch electrodes are arranged in a column direction of pixel units,

wherein each of the plurality of first touch electrodes arranged in the row direction of pixel units includes a plurality of first touch sub-electrodes separated from each other, each of the plurality of second touch electrodes arranged in the column direction of pixel units includes a single second touch electrode and in the row direction of pixel units, the first touch sub-electrodes of each first touch electrode are respectively located on two sides of each single second touch electrode and electrically connected via a first bridging line, the first bridging line and the gate lines are arranged between the substrate and the film, and each of the first touch sub-electrode is electrically connected with the first bridging line via a through hole formed in the film;

or

wherein each of the plurality of second touch electrodes arranged in the column direction of pixel units includes a plurality of second touch sub-electrodes separated from each other, each of the plurality of first touch electrodes arranged in the row direction of pixel units includes a single first touch electrode; and

in the column direction of pixel units, the second touch sub-electrodes of each second touch electrode are respectively located on two sides of each single first touch electrode and electrically connected via a second bridging line, the second bridging line and the data lines are arranged between the substrate and the film, and each the second touch sub-electrode is electrically connected with the second bridging line via a through hole formed in the film.

2. The In-Cell touch screen according to claim 1, wherein each first touch electrode and each second touch electrode have a mesh structure comprising a plurality of sub-squares respectively corresponding to a plurality of pixel units formed on the array substrate and arranged in a matrix.

3. The In-Cell touch screen according to claim 1, wherein the black matrix is located on the one side of the array substrate facing the opposed substrate;

the array substrate further comprises gate lines extending in the row direction of the pixel units; and

an extending direction of the first bridging line is the same as that of the gate lines.

4. The In-Cell touch screen according to claim 3, wherein the first bridging lines and the gate lines are arranged on the same layer.

5. The In-Cell touch screen according to claim 1, wherein the black matrix is located on the one side of the array substrate facing the opposed substrate;

the array substrate further comprises data lines extending in the column direction of the pixel units; and

an extending direction of the second bridging line is the same as that of the data lines.

6. The In-Cell touch screen according to claim 5, wherein the second bridging lines and the data lines are arranged on the same layer.

7. The In-Cell touch screen according to claim 1, further comprising color filters located on the one side of the array substrate facing the opposed substrate or on the one side of the opposed substrate facing the array substrate.

8. The In-Cell touch screen according to claim 1, wherein a time period during which the In-Cell touch screen displays one frame of picture is divided into a touch time period and a display time period, and during the touch time period, one of the first touch electrode and the second touch electrode is applied with a touch scan signal, so that the other of the first touch electrode and the second touch electrode is coupled with the touch scan signal and outputs a touch sensing signal.

9. A display apparatus, comprising the In-Cell touch screen according to claim 1.

10. The display apparatus according to claim 9, wherein each first touch electrode and each second touch electrode have a mesh structure comprising a plurality of sub-squares respectively corresponding to a plurality of pixel units formed on the array substrate and arranged in a matrix.

11. The display apparatus according to claim 9, wherein the black matrix is located on the one side of the array substrate facing the opposed substrate;

the array substrate further comprises gate lines extending in the row direction of the pixel units; and

an extending direction of the first bridging line is the same as that of the gate lines.

12. The display apparatus according to claim 11, wherein the first bridging lines and the gate lines are arranged on the same layer.

13. The display apparatus according to claim 9, wherein the black matrix is located on the one side of the array substrate facing the opposed substrate;

the array substrate further comprises data lines extending in the column direction of the pixel units; and

an extending direction of the second bridging line is the same as that of the data lines.

14. The display apparatus according to claim 13, wherein the second bridging lines and the data lines are arranged on the same layer.