Capacitive Touch Screen

• US 20090303202A1
• Filed: 07/25/2008
• Published: 12/10/2009
• Est. Priority Date: 06/04/2008
• Status: Abandoned Application

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Inventors: LIU, CHEN-YU, Wang, Ching-Yi
• Application Number:
  US12/179,596
• Publication Number:
  US 20090303202A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 a liquid crystal layer, an upper transparent conductive layer, a lower transparent conductive layer, an upper transparent plate, a lower transparent plate, an upper polarizing plate, a lower polarizing plate, a touch control circuit unit and a first dielectric layer. The upper transparent conductive layer, the first dielectric layer, the touch control circuit unit, the upper transparent plate and the upper polarizing plate are disposed on the liquid crystal layer in the above-mentioned order from one side of the liquid crystal layer. The lower transparent conductive layer, the lower transparent plate and the lower polarizing plate are disposed under the liquid crystal layer in the above-mentioned order from another side of the liquid crystal layer.

Claims

1. A capacitive touch screen comprising:

a liquid crystal layer, an upper transparent conductive layer, a lower transparent conductive layer, an upper transparent plate, a lower transparent plate, an upper polarizing plate, a lower polarizing plate, a touch control circuit unit and a first dielectric layer;

wherein the upper transparent conductive layer, the first dielectric layer, the touch control circuit unit, the upper transparent plate and the upper polarizing plate are sequentially disposed on the liquid crystal layer from one side of the liquid crystal layer; and

the lower transparent conductive layer, the lower transparent plate and the lower polarizing plate are sequentially disposed under the liquid crystal layer from another side of the liquid crystal layer.

2. The capacitive touch screen according to claim 1, wherein the touch control circuit unit comprises a conductive film and at least a conductive line connected with a periphery of the conductive film.

3. The capacitive touch screen according to claim 1, wherein the capacitive touch screen further comprises a shielding layer located between the touch control circuit unit and the upper transparent conductive layer for rejecting noise, and the shielding layer is dielectric with the touch control circuit unit and the upper transparent conductive layer.

4. The capacitive touch screen according to claim 1, wherein the upper transparent conductive layer is used for rejecting noise.

5. The capacitive touch screen according to claim 4, wherein a conductive film of the touch control circuit is made of an opaque metal.

6. The capacitive touch screen according to claim 1, wherein the first dielectric layer is a color resist layer.

7. The capacitive touch screen according to claim 6, wherein the upper transparent conductive layer is used for rejecting noise.

8. The capacitive touch screen according to claim 6, wherein the capacitive touch screen further comprises a shielding layer and a second dielectric layer, the shielding layer located between the touch control circuit unit and the first dielectric layer for rejecting noise, and the second dielectric layer located between the touch control circuit unit and the shielding layer.