IMBEDDED TOUCH SCREEN LIQUID CRYSTAL DISPLAY DEVICE AND TOUCH DRIVE METHOD THEREOF

• US 20140333582A1
• Filed: 09/14/2012
• Published: 11/13/2014
• Est. Priority Date: 11/25/2011
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Inventors: Huo, Sitao
• Granted Patent: US 9,442,330 B2
• 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: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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

An in-cell touch panel liquid crystal display device is disclosed. The display device includes a first substrate, a second substrate disposed opposite the first substrate, and a liquid crystal layer disposed between the first substrate and the second substrate. The display device also includes a common electrode layer disposed on a side of the second substrate facing the first substrate, where the common electrode layer includes a plurality of first common electrodes and a plurality of second common electrodes both arranged in a matrix. In addition, the first common electrodes and the second common electrodes are configured to detect a touched position on the in-cell touch panel liquid crystal display device.

Claims

1. An in-cell touch panel liquid crystal display device, comprising:

a first substrate;

a second substrate disposed opposite the first substrate;

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

a common electrode layer disposed on a side of the second substrate facing the first substrate,

wherein the common electrode layer comprises a plurality of first common electrodes and a plurality of second common electrodes both arranged in a matrix, wherein the first common electrodes and the second common electrodes are configured to detect a touched position on the in-cell touch panel liquid crystal display device.

2. The device of claim 1, wherein the first common electrodes are arranged in a first direction and electrically connected, and the second common electrodes are arranged in a second direction and electrically connected.

3. The device of claim 2, wherein the first common electrodes are directly connected, and the common electrodes are electrically connected by metal bridges located in a different layer from the common electrode layer.

4. The device of claim 3, further comprising a TFT layer which comprises:

a plurality of scan lines disposed on a side of the second substrate that faces the first substrate;

data lines intersecting with the scan lines;

TFTs formed in pixel regions defined by the scan lines and the data lines, wherein the TFT comprises;

a gate electrode electrically connected to one of the scan lines,

a gate insulating layer,

a semiconductor layer,

source and drain electrodes disposed on the gate electrode, wherein the source electrode of the TFT is electrically connected to the data line,

wherein a pixel electrode disposed on a side of the second substrate which faces the first substrate is electrically connected to the drain electrode of the TFT.

5. The device of claim 4, wherein the first common electrodes are disposed in the same direction with the scan lines, the second common electrodes are disposed in the same direction with the data lines, and the second common electrodes are electrically connected by the metal bridges located in the same layer with the scan drives.

6. The device of claim 4, wherein the first common electrodes are disposed in the same direction with the data lines, the second common electrodes are disposed in the same direction with the scan lines, and the second common electrodes are electrically connected by the metal bridges located in the same layer with the data drives.

7. The device of claim 2, further comprising a TFT layer which comprises:

scan lines disposed on a side of the second substrate which faces the first substrate, and data lines intersecting the scan lines;

TFTs formed in pixel regions defined by the scan lines and the data lines, where the TFT comprises;

a gate electrode electrically connected to the scan line,

a gate insulating layer,

a semiconductor layer, and

source and drain electrodes disposed on the gate electrode, wherein the source electrode is electrically connected to the data line, and wherein a pixel electrode disposed on a side of the second substrate that faces the first substrate is electrically connected to the drain electrode of the TFT,

wherein the first common electrodes are disposed in the same direction with the scan lines, the second common electrodes are disposed in the same direction with the data lines, the first common electrodes are electrically connected by the metal bridges located in the same layer with the scan drives, and the second common electrodes are electrically connected by the metal bridges located in the same layer with the data drives.

8. The device of claim 1, further comprising a display signal generating unit and a touch detecting signal generating unit, wherein the display signal generating unit is configured to provide a display signal to the first common electrodes and the second common electrodes, and the touch detecting signal generating unit is configured to provide a touch detecting signal to the first common electrodes and the second common electrodes.

9. The device of claim 8, wherein the display signal generating unit is configured to provide the display signal to the common electrode layer in the display mode, and the touch detecting signal generating unit is configured to provide the touch detecting signal to the common electrode layer in the touch mode.

10. The device of claim 9, wherein the touch detecting signal includes an excitation signal and a detection signal.

11. The device of claim 10, wherein in the touch mode, the touch detecting signal generating unit is configured to provide the excitation signal to the first common electrodes, and to provide the detection signal to the second common electrodes.

12. The device of claim 10, wherein in the touch mode, the touch detecting signal generating unit is configured to provide the excitation signal to the second common electrodes, and to provide the detection signal to the first common electrodes.

13. The device of claim 8, wherein the touch detecting signal generating unit is configured to provide the touch detecting signal to the common electrode layer simultaneously while the display signal generating unit provides the display signal to the common electrode layer.

14. The device of claim 13, wherein the touch detecting signal generating unit is configured to provide the excitation signal to the first common electrodes, and to provide the detection signal to the second common electrodes.

15. The device of claim 13, wherein the touch detecting signal generating unit is configured to provide the excitation signal to the second common electrodes, and to provide the detection signal to the first common electrodes.

16. The device of claim 13, wherein an equivalent DC component of the touch detecting signal is consistent with the display signal.

17. The device of claim 1, further comprising a color filter layer disposed between the second substrate and the common electrode layer.

18. A method of driving an in-cell touch panel liquid crystal display device, the display device comprising:

a first substrate, a second substrate disposed opposite the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and a common electrode layer disposed on a side of the second substrate facing the first substrate, wherein the common electrode layer comprises a plurality of first common electrodes and a plurality of second common electrodes both arranged in a matrix, wherein the first common electrodes and the second common electrodes are configured to detect a touched position on the in-cell touch panel liquid crystal display device, wherein a common electrode layer of the device is time division multiplexed, wherein the method comprises;

providing a display signal to the common electrode layer in a display mode; and

providing a touch detecting signal to the common electrode layer in a touch mode.

19. The method of claim 18, wherein the touch detecting signal comprises an excitation signal and a detection signal.

20. The method of claim 19, wherein in the touch mode, the excitation signal is provided to the first common electrodes and the detection signal is provided to the second common electrodes.

21. The method of claim 19, wherein in the touch mode, the excitation signal is provided to the second common electrodes and the detection signal is provided to the first common electrodes.

22. A method of driving an in-cell touch panel liquid crystal display device, the display device comprising:

a first substrate, a second substrate disposed opposite the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and a common electrode layer disposed on a side of the second substrate facing the first substrate, wherein the common electrode layer comprises a plurality of first common electrodes and a plurality of second common electrodes both arranged in a matrix, wherein the first common electrodes and the second common electrodes are configured to detect a touched position on the in-cell touch panel liquid crystal display device, wherein the method comprises;

simultaneously providing a display signal and a touch detecting signal to a common electrode layer of the in-cell touch panel liquid crystal display device; and

detecting a touched position on the in-cell touch panel liquid crystal display device while displaying an image.

23. The method of claim 22, wherein the touch detecting signal comprises an excitation signal and a detection signal.

24. The method of claim 23, wherein the detection signal is provided to the second common electrodes while the excitation signal is provided to the first common electrodes.

25. The method of claim 23, wherein the detection signal is provided to the first common electrodes while the excitation signal is provided to the second common electrodes.