Liquid crystal display integrated with capacitive touch devices

• US 20100231549A1
• Filed: 12/11/2009
• Published: 09/16/2010
• Est. Priority Date: 03/13/2009
• 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: Chien, Shun-Ta, Chang, Heng-Yao
• Application Number:
  US12/653,359
• Publication Number:
  US 20100231549A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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

Abstract

A liquid crystal display integrated with a capacitive touch device is provided. A first electrode layer is formed immediately on an upper surface of a polarizing plate of a liquid crystal display panel, and a second electrode layer is formed on the bottom surface of the polarizing plate of the liquid crystal display panel. When an object touches the capacitive touch device, it becomes capacitively coupled to the first electrode layer and the second electrode layer to generate a signal corresponding to the touched position.

Claims

1. An integrated capacitive touch device, comprising:

a liquid crystal display module comprising a polarizing plate, wherein the polarizing plate has an upper surface and a lower surface;

a first electrode layer having an electrode pattern, wherein the first electrode layer is formed immediately on the upper surface of the polarizing plate; and

a second electrode layer having an electrode pattern, wherein the second electrode layer is formed immediately on the lower surface of the polarizing plate.

2. The liquid crystal display as claimed in claim 1, wherein the electrode pattern of the first electrode layer and the second electrode layer comprises a plurality of electrode strips.

3. The liquid crystal display as claimed in claim 2, wherein each electrode strip of the first electrode layer and the second electrode layer comprises a plurality of electrically connected hexagonal electrodes.

4. The liquid crystal display as claimed in claim 1, further comprising an additional polarizing plate.

5. An integrated capacitive touch device, comprising:

a liquid crystal display module comprising a polarizing plate; and

a capacitive touch sensing layer situated immediately adjacent to the polarizing plate.

6. The liquid crystal display as claimed in claim 5, wherein the capacitive touch sensing layer has an electrode pattern.

7. The liquid crystal display as claimed in claim 6, wherein the electrode pattern of the capacitive touch sensing layer comprises a plurality of first electrode strips and a plurality of second electrode strips, the first electrode strips being arranged in a direction substantially perpendicular to that of the second electrode strips and overlap the second electrode strips, and wherein the first electrode strips are not in direct physical contact with the second electrode strips.

8. The liquid crystal display as claimed in claim 7, wherein each electrode strip of the first electrode layer and each electrode strip of the second electrode layer are separately formed of a plurality of electrically connected diamond-shaped electrodes.

9. An integrated capacitive touch device, comprising:

a liquid crystal display module comprising a polarizing plate; and

a capacitive touch sensing layer formed directly on the bottom surface of the polarizing plate, wherein the capacitive touch sensing layer includes first electrode strips for sensing movement in a first direction and second electrode strips for sensing movement in a second direction, and wherein the first electrode strips and the second electrode strips are not in direct physical contact.

10. An integrated capacitive touch device, comprising:

a liquid crystal display module comprising a polarizing plate; and

a capacitive touch sensing layer formed directly on the top surface of the polarizing plate, wherein the capacitive touch sensing layer includes first electrode strips for sensing movement in a first direction and second electrode strips for sensing movement in a second direction, and wherein the first electrode strips is not in direct physical contact with the second electrode strips.

11. An integrated capacitive touch device, comprising:

a liquid crystal display module comprising a polarizing plate, wherein the polarizing plate has a first surface and a second surface; and

an electrode layer having an electrode pattern in immediate physical contact with the polarizing plate.

12. The integrated capacitive touch device of claim 11, wherein the electrode layer is in immediate physical contact with the first surface of the polarizing plate.

13. The integrated capacitive touch device of claim 11, wherein the electrode layer is in immediate physical contact with the second surface of the polarizing plate.

14. The integrated capacitive touch device of claim 11, wherein the electrode layer is configured to sense touch movement in a first direction and touch movement in a second direction.

15. The integrated capacitive touch device of claim 14, wherein the electrode layer senses touch movement in a first direction via first electrode strips and touch movement in a second direction via second electrode strips, and wherein the first electrode strips and second electrode strips are substantially perpendicular.

16. The integrated capacitive touch device of claim 11, further comprising an additional electrode layer, wherein the electrode layer is configured to sense touch movement in a first direction, and the additional electrode layer is configured to sense touch movement in a second direction.

17. The integrated capacitive touch device of claim 16, wherein the electrode layer is in immediate physical contact with the first surface of the polarizing plate, and wherein the additional electrode layer is in immediate physical contact with the second surface of the polarizing plate.

18. A liquid crystal display integrated with a capacitive touch device, comprising:

a liquid crystal display panel, comprising a liquid crystal display module, the liquid crystal display module comprising an upper polarizing plate and a lower polarizing plate;

a first electrode layer, having a predetermined electrode pattern formed on a top of the upper polarizing plate; and

a second electrode layer, having a predetermined electrode pattern formed on a bottom of the upper polarizing plate, wherein when an object touches the liquid crystal display, the object is capacitively coupled to the first electrode layer and the second electrode layer respectively, and the position touched by the object is determined.

19. A method for producing a liquid crystal display integrated with a capacitive touch device, comprising:

providing a liquid crystal display module comprising a polarizing plate; and

forming a capacitive touch sensing layer immediately on the polarizing plate.

20. A method of manufacturing a liquid crystal display integrated with a capacitive touch device, comprising:

providing a liquid crystal display module comprising a polarizing plate, wherein the polarizing plate has an upper surface and a lower surface;

forming a first electrode layer having an electrode pattern immediately on the upper surface of the polarizing plate; and

forming a second electrode layer having an electrode pattern immediately on the lower surface of the polarizing plate.