CAPACITIVE TOUCH SCREENS, METHOD OF DRIVING THE SAME AND DISPLAYS

• US 20140111710A1
• Filed: 10/18/2013
• Published: 04/24/2014
• Est. Priority Date: 10/19/2012
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Yang, Shengji, Dong, Xue, Wang, Haisheng, Zhao, Weijie, Liu, Yingming, Ren, Tao, Ding, Xiaoliang, Liu, Hongjuan
• Granted Patent: US 9,057,906 B2
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/1333 Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A capacitive in cell touch panel, its driving method and a display device, in which, on the TFT array substrate, a pixel structure in which two adjacent rows of pixel units form one pixel unit group and two gate signal lines are disposed between the two rows of pixel units of the pixel unit group is adopted. Positions of gate signal lines between adjacent pixel unit groups can be saved by modifying positions of gate signal lines of two adjacent rows of pixel units and TFT switches. As such, touch driving lines with touch function can be set at the saved positions for gate signal lines and touch sensing electrodes can be disposed on the color filter substrate and extend in the column direction of the pixel units to realize touch function while ensuring high aperture ratio.

Claims

1. A capacitive in cell touch panel, comprising:

a color filter substrate,

a thin film transistor (TFT) array substrate, and

a liquid crystal layer between said color filter substrate and said TFT array substrate, wherein said array substrate includes a plurality of pixel units arranged in matrix, every two adjacent rows of pixel units in said plurality of pixel units are one pixel unit group, two gate signal lines are disposed between the two rows of pixel units of said pixel unit group, and said two gate signal lines are configured to supply gate scan signals to the two rows of pixel units, respectively,

wherein said color filter substrate includes a plurality of touch sensing electrodes extending in a column direction of pixel units, and

wherein said TFT array substrate includes a plurality of touch driving lines extending in a row direction of the pixel units, each of said touch driving lines is located at a gap between the adjacent pixel unit groups, and during a display time period for a frame of a picture, said touch driving lines are configured to transfer common electrode signals and touch scanning signals in a time-division manner.

2. The touch panel of claim 1, wherein said TFT array substrate further includes a plurality of touch driving electrodes extending in a row direction of pixel units, each of said touch driving electrodes is located at a gap between adjacent pixel units and is electrically connected with a touch driving line overlappedly through at least one via hole.

3. The touch panel of claim 2, wherein said touch driving lines and gate signal lines in said TFT array substrate are disposed in a same layer.

4. The touch panel of claim 2, wherein said touch driving electrodes and said common electrodes or pixel electrodes in said TFT array substrate are disposed in a same layer and insulated from each other.

5. The touch panel of claim 1, wherein each of said touch driving electrodes comprises at least one transverse touch driving sub-electrode and at least one longitudinal touch driving sub-electrode that are electrically connected, said transverse touch driving sub-electrode is located at a gap between adjacent pixel unit groups, and

said longitudinal touch driving sub-electrode is located at a gap between adjacent columns of pixel units.

6. The touch panel of claim 2, wherein each of said touch driving electrodes comprises at least one transverse touch driving sub-electrode and at least one longitudinal touch driving sub-electrode that are electrically connected,

said transverse touch driving sub-electrode is located at a gap between adjacent pixel unit groups, and

said longitudinal touch driving sub-electrode is located at a gap between adjacent columns of pixel units.

7. The touch panel of claim 3, wherein each of said touch driving electrodes comprises at least one transverse touch driving sub-electrode and at least one longitudinal touch driving sub-electrode that are electrically connected,

said transverse touch driving sub-electrode is located at a gap between adjacent pixel unit groups, and

said longitudinal touch driving sub-electrode is located at a gap between adjacent columns of pixel units.

8. The touch panel of claim 4, wherein each of said touch driving electrodes comprises at least one transverse touch driving sub-electrode and at least one longitudinal touch driving sub-electrode that are electrically connected,

said transverse touch driving sub-electrode is located at a gap between adjacent pixel unit groups, and

said longitudinal touch driving sub-electrode is located at a gap between adjacent columns of pixel units.

9. The touch panel of claim 5, wherein each of said touch sensing electrodes comprises at least one transverse touch sensing sub-electrode and at least one longitudinal touch sensing sub-electrode that are electrically connected, wherein

a projection of said transverse touch sensing sub-electrode on the TFT array substrate covers the two gate signal lines between two rows of pixel units, and

a projection of said longitudinal touch sensing sub-electrode on the TFT array substrate covers a gap between adjacent columns of pixel units except said longitudinal touch driving sub-electrode.

10. The touch panel of claim 9, wherein said touch panel comprises touch driving electrode separate arrangement areas, touch sensing electrode separate arrangement areas and common areas arranged in a staggered manner;

and wherein

in said touch driving electrode separate arrangement areas, only said touch driving electrodes are disposed;

in said touch sensing electrode separate arrangement areas, only said touch sensing electrodes are disposed; and

in said common areas, both said touch driving electrodes and said touch sensing electrodes are disposed.

11. The touch panel of claim 1, wherein said touch sensing electrodes are located between a substrate of said color filter substrate and a color resin, or located on a side of the color resin of said color filter substrate facing said liquid crystal layer.

12. The touch panel of claim 1, further comprising:

an anti-electrostatic protection film located on a side of said color filter substrate facing away from said liquid crystal layer and grounded, wherein said anti-electrostatic protection film includes a grid structure.

13. The touch panel of claim 11, further comprising:

an anti-electrostatic protection film located on a side of said color filter substrate facing away from said liquid crystal layer and grounded, wherein said anti-electrostatic protection film includes a grid structure.

14. A display device comprising a capacitive in cell touch panel of claim 1.

15. A driving method of the capacitive in cell touch panel of claim 1, comprising:

dividing a time period for the touch panel to display each frame of a picture into a display time period and a touch time period,

during the display time period, successively applying gate scanning signals to each of gate signal lines in said touch panel, applying gray scale signals to data signal lines to control the rotation of liquid crystal molecules, and applying low level signals to the touch driving electrodes and the touch sensing electrodes at the same time, and

during the touch time period, applying touch scanning signals to touch driving lines electrically connected with touch driving electrodes, wherein the touch sensing electrodes couple and output voltage signals of said touch scanning signals, and no signal is input into each of the gate signal lines and data signal lines in said touch panel.