DISPLAY DEVICE AND METHOD OF APPLYING THE SAME

• US 20100315374A1
• Filed: 04/21/2010
• Published: 12/16/2010
• Est. Priority Date: 06/15/2009
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lai, Ming-Sheng, Chiang, Min-Feng, Liu, Po-Yuan, Chen, Tzu-Jung
• Application Number:
  US12/764,095
• Publication Number:
  US 20100315374A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A display device and a method of applying the same are introduced herein. A shielding layer is utilized to interpose between a transparent conductive layer of a touch element and a common electrode layer of a liquid crystal display (LCD) panel. With controlling variances of a first and a second control signals, a coupling current between the transparent conductive layer and common electrode layer can approach none, whereby influences of capacitive coupling effect between the common electrode layer or shielding layer and the transparent conductive layer of the touch element can be reduced. Thus, high touch accuracy of the touch element can be achieved and the noise can be eliminated simultaneously.

Claims

1. A display device comprising:

a touch element comprising a first conductive layer to receive a first control signal, to form a first capacitor in response to a contact on the first conductive layer, and to generate a sensing signal corresponding to the first capacitor; and

a second conductive layer for receiving a second control signal to enhance the sensing signal.

2. The display device as claimed in claim 1, wherein the second control signal and the first control signal are synchronous.

3. The display device as claimed in claim 1, wherein the touch element further comprises a contact layer to form the first capacitor when being touched.

4. The display device as claimed in claim 3, wherein the contact layer is a polarizer film to be touched by an object.

5. The display device as claimed in claim 3, wherein the first conductive layer comprises peripheral patterned electrode for delivering the sensing signal as soon as the first capacitor is formed.

6. The display device as claimed in claim 1, wherein a second capacitor is formed between the first conductive layer and the second conductive layer and a coupling current flows through the second capacitor, when the second conductive layer receives the second control signal as wells as the first conductive layer receives the first control signal, in which the coupling current is close to zero to suppress a capacitive coupling effect between the first conductive layer and the second conductive layer.

7. The display device as claimed in claim 1, further comprising a liquid crystal display panel with a third conductive layer which provides a common electrode to receive a third control signal, and to form a third capacitor between the second conductive layer and the third conductive layer.

8. The display device as claimed in claim 7, wherein the first control signal and the second control signal are synchronous, but not synchronous with the third control signal.

9. The display device as claimed in claim 7, wherein the second conductive layer is disposed within the touch element, and an insulating layer is disposed between the first conductive layer and the second conductive layer.

10. The display device as claimed in claim 7, wherein the first control signal, the second control signal and the third control signal are different, and the second control signal is floating.

11. The display device as claimed in claim 7, wherein the liquid crystal display panel further comprises a color filter, the second conductive layer is disposed between the color filter and the third conductive layer.

12. The display device as claimed in claim 11, wherein an insulating layer is disposed between the second conductive layer and the third conductive layer.

13. A method of applying the display device, the display device comprising a first conductive layer and a second conductive layer, the method comprising:

making the first conductive layer to receive a first control signal, forming a first capacitor in response to a contact on the first conductive layer, and generating a sensing signal corresponding to the first capacitor;

making the second conductive layer to receive a second control signal, forming a second capacitor between the first conductive layer and the second conductive layer, and generating a coupling signal, wherein the coupling signal is reduced by controlling the second control signal and the first control signal.

14. The method as claimed in claim 13, wherein the display device further comprises a liquid crystal display panel and a touch element on a surface of the liquid crystal display panel.

15. The method as claimed in claim 14, wherein the touch element further comprises a contact layer to form the first capacitor when being touched, and the first conductive layer is disposed within the touch element.

16. The method as claimed in claim 15, further comprising:

forming the first capacitor with the contact layer, and delivering the sensing signal by using patterned electrode around the first conductive layer.

17. The method as claimed in claim 13, further comprising:

controlling variations of the first control signal and the second control signal to make the sensing signal greater than the coupling signal.

18. The method as claimed in claim 13, further comprising:

synchronizing the first control signal and the second control signal.

19. The method as claimed in claim 14, wherein the second conductive layer is disposed within the touch element, and an insulating layer is disposed between the first conductive layer and the second conductive layer.

20. The method as claimed in claim 13, further comprising:

controlling the first control signal and the second control signal to be different, wherein the second control signal is floating.

21. The method as claimed in claim 14, wherein the second conductive layer is disposed within the liquid crystal display panel.

22. A display device comprising:

a liquid crystal display panel with a touch element thereon;

the touch element comprising;

a first conductive layer for receiving a first control signal;

a contact layer on the first conductive layer for being touched by an object;

a patterned electrode around the first conductive layer for delivering a corresponding sensing signal as soon as the contact layer is touched by the object; and

a second conductive layer disposed between the contact layer of the touch element and the liquid crystal display panel, or disposed within the liquid crystal display panel, for receiving a second control signal to enhance the sensing signal.

23. The display device as claimed in claim 22, wherein a first capacitor is formed over the first conductive layer, and the sensing signal from patterned electrode flows through the first conductive layer to charge the first capacitor, when the contact layer is touched by the object.

24. The display device as claimed in claim 22, wherein the second control signal and the first control signal are synchronous.

25. The display device as claimed in claim 22, wherein the contact layer is a polarizer film to be touched by the object.

26. The display device as claimed in claim 22, wherein a second capacitor is formed between the first conductive layer and the second conductive layer and a coupling current flows through the second capacitor, when the second conductive layer receives the second control signal as wells as the first conductive layer receives the first control signal, in which the coupling current is close to zero to suppress a capacitive coupling effect between the first conductive layer and the second conductive layer.

27. The display device as claimed in claim 22, wherein the liquid crystal display panel further comprises a third conductive layer which provides a common electrode to receive a third control signal, and to form a third capacitor between the second conductive layer and the third conductive layer.

28. The display device as claimed in claim 27, wherein the first control signal and the second control signal are synchronous, but not synchronous with the third control signal.

29. The display device as claimed in claim 22, wherein the second conductive layer is disposed within the touch element, and an insulating layer is disposed between the first conductive layer and the second conductive layer.

30. The display device as claimed in claim 27, wherein the first control signal, the second control signal and the third control signal are different, and the second control signal is floating.

31. The display device as claimed in claim 27, wherein the liquid crystal display panel further comprises a color filter, the second conductive layer is disposed between the color filter and the third conductive layer.

32. The display device as claimed in claim 27, wherein an insulating layer is disposed between the second conductive layer and the third conductive layer.