MUTUAL CAPACITANCE TOUCH DISPLAY PANEL AND MANUFACTURING METHOD THEREOF

• US 20170220159A1
• Filed: 07/23/2015
• Published: 08/03/2017
• Est. Priority Date: 06/29/2015
• Status: Abandoned Application

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Xu, Xiangyang
• Application Number:
  US14/778,609
• Publication Number:
  US 20170220159A1
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133516 Methods for their manufacture, e.g. printing, electro-deposition or photolithography
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

The present invention provides a mutual capacitance touch display panel and a manufacturing method thereof. The mutual capacitance touch display panel includes touch transmission electrodes (4) that are integrated on a surface of a CF substrate (2) that is distant from a liquid crystal layer (3) and transparent touch detection electrodes (5) integrated on a surface of the CF substrate (2) that is adjacent to the liquid crystal layer (3). The touch detection electrodes (5) are subjected to high temperature annealing treatment. The manufacturing method of the mutual capacitance touch display panel forms, before the formation of the liquid crystal layer (3), the transparent touch detection electrodes (5) on the surface of the CF substrate (2) that is adjacent to the liquid crystal layer (3) and applies high temperature annealing to reduce the impedance of the touch detection electrodes (5), laminates the CF substrate (2) to a TFT base plate (1), and forms, after the formation of the liquid crystal layer (3), the touch transmission electrodes (4) on the surface of the CF substrate (2) that distant from the liquid crystal layer (3). The present invention reduces the impedance of the touch detection electrodes and increases the touch sensitivity of the touch display panel.

Claims

1. A mutual capacitance touch display panel, comprising:

a thin-film transistor (TFT) array substrate, a color filter (CF) substrate opposite to the TFT array substrate, a liquid crystal layer interposed between the TFT array substrate and the CF substrate, a plurality of touch transmission electrodes formed on a surface of the CF substrate that is distant from the liquid crystal layer and parallel to each other, and a plurality of transparent touch detection electrodes formed on a surface of the CF substrate that is adjacent to the liquid crystal layer and are parallel to each other and are perpendicular to the touch transmission electrodes in space;

the touch detection electrodes being subjected to high temperature annealing treatment.

2. The mutual capacitance touch display panel as claimed in claim 1, wherein the CF substrate comprises a base plate, the plurality of touch transmission electrodes being arranged on a surface of the base plate that is distant from the liquid crystal layer, the plurality of touch detection electrodes being arranged on a surface of the base plate that is adjacent to the liquid crystal layer;

the CF substrate further comprising a plurality of color resists arranged on the base plate and the touch detection electrodes, a plurality of black matrixes separating the color resists, a plurality of photo spacers arranged on the black matrixes, and an alignment film covering the color resists, the black matrixes, and the photo spacers.

3. The mutual capacitance touch display panel as claimed in claim 1, wherein the touch detection electrodes are formed of a material of indium tin oxide (ITO).

4. The mutual capacitance touch display panel as claimed in claim 3, wherein the touch detection electrodes have a thickness of 500-1000 Å

.

5. The mutual capacitance touch display panel as claimed in claim 1, wherein the touch transmission electrodes are formed of a material of ITO or a metal.

6. A mutual capacitance touch display panel, comprising:

a thin-film transistor (TFT) array substrate, a color filter (CF) substrate opposite to the TFT array substrate, a liquid crystal layer interposed between the TFT array substrate and the CF substrate, a plurality of touch transmission electrodes formed on a surface of the CF substrate that is distant from the liquid crystal layer and parallel to each other, and a plurality of transparent touch detection electrodes formed on a surface of the CF substrate that is adjacent to the liquid crystal layer and are parallel to each other and are perpendicular to the touch transmission electrodes in space;

the touch detection electrodes being subjected to high temperature annealing treatment;

wherein the CF substrate comprises a base plate, the plurality of touch transmission electrodes being arranged on a surface of the base plate that is distant from the liquid crystal layer, the plurality of touch detection electrodes being arranged on a surface of the base plate that is adjacent to the liquid crystal layer;

the CF substrate further comprising a plurality of color resists arranged on the base plate and the touch detection electrodes, a plurality of black matrixes separating the color resists, a plurality of photo spacers arranged on the black matrixes, and an alignment film covering the color resists, the black matrixes, and the photo spacers;

wherein the touch detection electrodes are formed of a material of indium tin oxide (ITO); and

wherein the touch transmission electrodes are formed of a material of ITO or a metal.

7. The mutual capacitance touch display panel as claimed in claim 6, wherein the touch detection electrodes have a thickness of 500-1000 Å

.

8. A manufacturing method of a mutual capacitance touch display panel, comprising the following steps:

(1) providing a base plate, coating a transparent conductive film on a surface of the base plate, and patterning the transparent conductive film through a masking and etching operation so as to form a plurality of parallel and transparent touch detection electrodes;

(2) subjecting the plurality of parallel and transparent touch detection electrodes to high temperature annealing so as to reduce impedance of the touch detection electrodes;

(3) applying masking and etching operations to form, in sequence, a plurality of black matrixes, a plurality of color resists, and a plurality of photo spacers on the base plate and the touch detection electrodes,

wherein the black matrixes separate the color resists and the photo spacers are formed on the black matrixes;

(4) coating an alignment liquid on the color resists, the black matrixes, and the photo spacers to form an alignment film thereby forming a color filter (CF) substrate;

(5) providing a thin-film transistor (TFT) array substrate and laminating the TFT array substrate and the CF substrate together with the touch detection electrodes facing the TFT array substrate;

filling liquid crystal between the TFT array substrate and the CF substrate to form a liquid crystal layer; and

(6) coating a conductive film on a surface of the base plate of the CF substrate that is distant from the liquid crystal layer;

patterning the conductive film through a masking and etching operation to form a plurality of touch transmission electrodes that is parallel to each other and is perpendicular to the touch detection electrodes in space.

9. The manufacturing method of the mutual capacitance touch display panel as claimed in claim 8, wherein in step (1), the transparent conductive film is formed of a material of indium tin oxide (ITO).

10. The manufacturing method of the mutual capacitance touch display panel as claimed in claim 9, wherein the transparent conductive film has a thickness of 500-1000 Å

.

11. The manufacturing method of the mutual capacitance touch display panel as claimed in claim 8, wherein in step (6), the conductive film is formed of a material of ITO or a metal.

12. The manufacturing method of the mutual capacitance touch display panel as claimed in claim 8, wherein the base plate comprises a glass plate.