CAPACITIVE TOUCH SCREEN AND MANUFACTURING METHOD THEREOF

• US 20090061115A1
• Filed: 05/13/2008
• Published: 03/05/2009
• Est. Priority Date: 08/30/2007
• Status: Abandoned Application

• Current Assignee: Shenzhen H&T Intelligent Control Company Limited
• Original Assignee: Shenzhen H&T Intelligent Control Company Limited
• Inventors: WANG, XIANFANG, LIU, JIANWEI
• Application Number:
  US12/119,537
• Publication Number:
  US 20090061115A1
• Time in Patent Office: Days
• US Class Current: 428/1.100
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• 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

A capacitive touch screen includes an indium tin oxide layer and a transparent protection layer on top of the indium tin oxide layer, wherein buttons and lines are etched on the indium tin oxide layer, and each of the buttons is connected to an electronic control circuit through at least one of the lines. A method for manufacturing a capacitive touch screen comprises: (A1) providing a first indium tin oxide layer; (A2) etching buttons and lines on the first indium tin oxide layer through photolithography process. The buttons and lines are etched directly on the indium tin oxide layer, and the touch screen is integrated with the LCD, which does not increase any thickness and transmits the information in the line by the simplest way. The capacitive touch screen of the invention has high efficiency, exact orientation, convenient installation, low cost, good appearance, etc.

Claims

1. A capacitive touch screen comprising:

an indium tin oxide layer;

a transparent protect layer on top of the indium tin oxide layer;

wherein buttons and lines are etched on the indium tin oxide layer, and each of the buttons is connected to an electronic control circuit by at least one of the lines.

2. The capacitive touch screen according to claim 1, wherein said lines are connected to the electronic control circuit by pin, FPC or zebra barcode.

3. The capacitive touch screen according to claim 1, wherein a liquid crystal screen is provided below said indium tin oxide layer, and the liquid crystal screen is mounted above a liquid crystal backlight.

4. The capacitive touch screen according to claim 1, wherein LED indicator lights, VFDs or display screens of organic electroluminescence are provided below said buttons and said lines.

5. The capacitive touch screen according to claim 1, wherein the buttons are provided on an upper glass layer;

a second indium tin oxide layer is provided below the bottom surface of the upper glass layer;

a lower glass layer is provided with a third indium tin oxide layer on the top surface;

liquid crystal is filled between the second indium tin oxide layer and the third indium tin oxide layer;

a tn-lcd is formed by the second indium tin oxide layer, the liquid crystal and the third indium tin oxide layer;

the figure of the liquid crystal screen and transmission lines are etched on the second indium tin oxide layer and the third indium tin oxide layer.

6. The capacitive touch screen according to claim 1, wherein the lines of said buttons are leaded from the upper glass layer, and the pins of said liquid crystal screen are leaded from the lower glass layer.

7. A method for manufacturing a capacitive touch screen, comprising:

(A1) providing a first indium tin oxide layer;

(A2) etching buttons and lines on the first indium tin oxide layer through photolithography process.

8. The method of claim 7, wherein said first indium tin oxide layer is provided on the top surface of the upper glass layer, and the method further comprises the following steps after step A1:

(B1) providing a second indium tin oxide layer on the bottom surface of the upper glass layer;

(B2) providing a third indium tin oxide layer on the top surface of a lower glass layer;

and after step A2, the method further comprises;

(C1) etching electrodes and lines on the second indium tin oxide layer and the third indium tin oxide layer through photolithography process;

(C2) forming an empty box by using the upper glass layer and the lower glass layer;

(C3) pouring pre-brewage liquid crystal into the empty box, and sealing the box.

9. The method of claim 7, wherein in the step A1, the first indium tin oxide layer is provided on the bottom surface of a transparent glass layer.

10. The method of claim 7, wherein in the step A1, the first indium tin oxide layer is provided on the top surface of a transparent glass layer, and a transparent protection layer is further provided above the first indium tin oxide layer.