TOUCH-SENSING DISPLAY DEVICE

• US 20120206403A1
• Filed: 02/09/2012
• Published: 08/16/2012
• Est. Priority Date: 02/11/2011
• Status: Abandoned Application

• Current Assignee: Wintek Corporation
• Original Assignee: Wintek Corporation
• Inventors: WANG, Po-Hsien, Yeh, Cheng-Yen, Su, Chen-Hao, Chen, Yu-Ting
• Application Number:
  US13/369,832
• Publication Number:
  US 20120206403A1
• 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 3/0412 Digitisers structurally integrated in a display
• 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

A touch-sensitive display device includes a color filter substrate, an array substrate, a liquid crystal layer, and a touch-sensing structure. The touch-sensing structure is disposed on the color filter substrate and includes at least one first sensing series and at least one second sensing series overlapped with and spaced apart from the first sensing series. During a touch-sensing operation, the first sensing series receives a common voltage scanning signal, and the second sensing series receives a sensing signal to sense coupling capacitance formed as a result of a touch action when the common voltage scanning signal drives the first sensing series.

Claims

1. A touch-sensitive display device, comprising:

a color filter substrate;

an array substrate disposed opposite the color filter substrate and spaced apart from the color filter substrate;

a liquid crystal layer disposed between the color filter substrate and the array substrate; and

a touch-sensing structure disposed on the color filter substrate and comprising at least one first sensing series and at least one second sensing series overlapped with and spaced apart from the first sensing series, wherein, during a touch-sensing operation, the first sensing series receives a common voltage scanning signal and the second sensing series receives a sensing signal to sense coupling capacitance formed as a result of a touch action when the common voltage scanning signal drives the first sensing series.

2. The touch-sensitive display device as claimed in claim 1, wherein the first sensing series is disposed on one side of the color filter substrate facing the array substrate, and the second sensing series is disposed on one side of the color filter substrate back to the array substrate.

3. The touch-sensitive display device as claimed in claim 1, wherein the first sensing series is disposed on one side of the color filter substrate back to the array substrate, and the second sensing series is disposed on one side of the color filter substrate facing the array substrate.

4. The touch-sensitive display device as claimed in claim 1, wherein the first sensing series comprises n (n is a positive integer) first stripe electrodes substantially parallel to each other, and the common electrode scanning signal successively drives the first stripe electrodes.

5. The touch-sensitive display device as claimed in claim 4, wherein the second sensing series comprises a plurality of second stripe electrodes substantially parallel to each other, and the second stripe electrodes cross the first stripe electrodes.

6. The touch-sensitive display device as claimed in claim 1, wherein the first sensing series serves as a common electrode needed to drive the liquid crystal layer.

7. The touch-sensitive display device as claimed in claim 6, further comprising:

a plurality of common lines formed on the array substrate, wherein the first sensing series is connected with the common lines.

8. The touch-sensitive display device as claimed in claim 7, further comprising:

a plurality of conductive media disposed between the color filter substrate and the array substrate to connect the first sensing series with the common lines.

9. The touch-sensitive display device as claimed in claim 8, wherein each of the conductive media comprises a conductive spacer or silver paste.

10. The touch-sensitive display device as claimed in claim 6, further comprising:

a plurality of conductive pads formed on the array substrate; and

at least one flexible circuit board connected to the second sensing series and the conductive pads.

11. The touch-sensitive display device as claimed in claim 6, further comprising:

a conductive black matrix layer formed on the color filter substrate and connected to the first sensing series.

12. The touch-sensitive display device as claimed in claim 1, further comprising:

a decorative layer disposed on a periphery of the color filter substrate.

13. The touch-sensitive display device as claimed in claim 12, wherein the decorative layer comprises at least one of ceramic, diamond-like carbon, color ink, photo resist and resin.

14. A touch-sensitive display device, comprising:

a color filter substrate;

an array substrate disposed opposite the color filter substrate and spaced apart from the color filter substrate;

a liquid crystal layer disposed between the color filter substrate and the array substrate;

a cover glass disposed on one side of the color filter substrate back to the array substrate; and

a touch-sensing structure disposed on the color filter substrate and comprising a first sensing series and a second sensing series overlapped with and spaced apart from the first sensing series, wherein, during a touch-sensing operation, the first sensing series receives a common voltage scanning signal and the second sensing series receives a sensing signal to sense coupling capacitance formed as a result of a touch action when the common voltage scanning signal drives the first sensing series.

15. The touch-sensitive display device as claimed in claim 14, wherein the first sensing series is formed on the color filter substrate, and the second sensing series is formed on the cover glass.

16. The touch-sensitive display device as claimed in claim 14, wherein the first sensing series is formed on the cover glass, and the second sensing series is formed on the color filter substrate.

17. The touch-sensitive display device as claimed in claim 14, wherein the cover glass is adhered to one side of the color filter substrate back to the array substrate via an optical adhesive.

18. The touch-sensitive display device as claimed in claim 14, wherein the first sensing series is disposed on one side of the color filter substrate facing the cover glass, and the second sensing series is disposed on one side of the cover glass facing the color filter substrate.

19. The touch-sensitive display device as claimed in claim 14, wherein the first sensing series is formed on one side of the color filter substrate facing the array substrate and serves as a common electrode needed to drive the liquid crystal layer, and the second sensing series is formed on one side of the cover glass facing the color filter substrate.

20. The touch-sensitive display device as claimed in claim 14, wherein the first sensing series comprises n (n is a positive integer) first stripe electrodes substantially parallel to each other, and the common electrode scanning signal successively drives the first stripe electrodes.

21. The touch-sensitive display device as claimed in claim 20, wherein the second sensing series comprises a plurality of second stripe electrodes substantially parallel to each other, and the second stripe electrodes cross the first stripe electrodes.

22. The touch-sensitive display device as claimed in claim 14, further comprising:

a decorative layer disposed on a periphery of the color filter substrate.

23. The touch-sensitive display device as claimed in claim 22, wherein the decorative layer comprises at least one of ceramic, diamond-like carbon, color ink, photo resist and resin.

24. A touch-sensitive display device, comprising:

a first substrate;

a second substrate disposed opposite the first substrate and spaced apart from the first substrate;

a liquid crystal layer, disposed between the first substrate and the second substrate;

a touch-sensing structure disposed at least on the first substrate and comprising a plurality of driving electrodes and a plurality of sensing electrodes overlapped with and spaced apart from the driving electrodes; and

a signal processing unit disposed on the second substrate, wherein the signal processing unit outputs at least one gate drive signal, at least one pixel data signal and at least one common voltage scanning signal to drive the liquid crystal layer and effect image display, the signal processing unit outputs at least one sensing signal to sense coupling capacitance formed as a result of a touch action, and each of the sensing electrodes receives the sensing signal to sense the coupling capacitance when the common voltage scanning signal successively drives the driving electrodes.

25. The touch-sensitive display device as claimed in claim 24, further comprising:

a plurality of conductive media disposed between the first substrate and the second substrate, wherein the common voltage scanning signal is transmitted to the driving electrodes through the conductive media.

26. The touch-sensitive display device as claimed in claim 24, further comprising:

a plurality of conductive pads formed on the second substrate and connected to the signal processing unit; and

at least one flexible circuit board connected to the sensing electrodes and the conductive pads.

27. The touch-sensitive display device as claimed in claim 24, wherein the gate drive signal is in a low voltage level during the occurrence of pulses of the common voltage scanning signal.

28. The touch-sensitive display device as claimed in claim 24, wherein pulses of the common voltage scanning signal are interpolated and evenly spaced in one display frame.

29. The touch-sensitive display device as claimed in claim 24, wherein the frame time of a display frame is divided into a display period and a touch-sensing period, and the common voltage scanning signal drives the driving electrodes only in the touch-sensing period.

30. The touch-sensitive display device as claimed in claim 24, further comprising:

a cover glass adhered to one side of the first substrate back to the second substrate, wherein the touch-sensing structure is disposed on the first substrate and the cover glass.