Mutual capacitive in-cell display device and the driving method thereof

• US 10,152,155 B2
• Filed: 07/12/2016
• Issued: 12/11/2018
• Est. Priority Date: 04/18/2016
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Li, Man, Ji, Feilin, Tan, Xiaoping
• Primary Examiner(s): Davis, Tony
• Application Number:
  US15/118,830
• Publication Number:
  US 20180164928A1
• Time in Patent Office: 882 Days
• Field of Search: 345170-176
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

The present disclosure discloses a mutual capacitive in-cell display device and the driving method thereof. The mutual capacitive in-cell display device comprises: a first substrate; a touch panel, which is provided on the first substrate; a driver integrated circuit, which is used to send a first enable signal and a second enable signal; multiple gate lines, each gate line comprising a first switching transistor, the control terminal of the first switching transistor being connected to the driver integrated circuit; multiple data lines, each data line comprising a second switching transistor, the control terminal of the second switching transistor being connected to the driver integrated circuit. When the first switching transistor is turned on in responses to the first enable signal and the second switching transistor is turned on in response to the second enable signal in standby mode, the multiple data lines are connected to the touch panel to discharge.

Claims

1. A mutual capacitive in-cell display device, comprising:

a first substrate;

a touch panel, which is provided on the first substrate;

a driver integrated circuit, which is used to send a first enable signal and a second enable signal;

multiple gate lines, each gate line comprising a first switching transistor, the control terminal of the first switching transistor being connected to the driver integrated circuit;

multiple data lines, each data line comprising a second switching transistor, the control terminal of the second switching transistor being connected to the driver integrated circuit;

wherein when the first switching transistor and the second switching transistor are turned on by respectively responding to the first enable signal and the second enable signal in standby mode, the multiple data lines are connected to the touch panel to discharge;

wherein the touch panel comprises multiple mutual capacitive touch sensors arranged in a matrix;

each touch sensor comprises a first electrode and a second electrode;

the first electrode sends a touch signal; and

the second electrode receives the touch signal;

wherein the first electrode is provided on the first substrate in a row direction;

the second electrode is provided on the first electrode in a column direction;

an insulating layer is provided between the first electrode and the second electrode;

wherein the second switching transistor is connected between the data line and the first electrode of the touch sensor; and

wherein when not performing touch scanning, the first electrode of the touch sensor has a predetermined potential, the multiple data lines are discharge to the predetermined potential during the second switching transistor turned on.

2. The mutual capacitive in-cell display device as claimed in claim 1, wherein the predetermined potential is a ground potential.

3. The mutual capacitive in-cell display device as claimed in claim 1, wherein the first switching transistor is connected between the gate line and a gate driver, the gate driver is used to apply a VGH signal to the multiple gate lines during the first switching transistor turned on.

4. The mutual capacitive in-cell display device as claimed in claim 3, wherein the gate driver comprises a GOA circuit.

5. The mutual capacitive in-cell display device as claimed in claim 1, further comprising:

a liquid crystal layer, which is provided on the first substrate integrally with the touch panel;

a second substrate, which is provided on the liquid crystal layer; and

a transparent cover, which is provided on the second substrate;

wherein a color filter is provided on the surface of the second substrate facing the touch panel.

6. A driving method of a mutual capacitive in-cell display device, comprising:

in a standby mode, a driver integrated circuit sending a first enable signal and a second enable signal simultaneously at a predefined interval;

a first switching transistor connected to each of multiple gate lines being turned on in response to the first enable signal, a second switching transistor connected to each of multiple data lines being turned on in response to the second enable signal;

wherein, during the first transistor and the second switching transistor being turned on, the data line is connected to a touch panel to discharge;

wherein the touch panel comprises multiple mutual capacitive touch sensors arranged in a matrix;

each touch sensor comprises a first electrode and a second electrode;

the first electrode sends a touch signal; and

the second electrode receives the touch signal;

wherein the first electrode is provided on the first substrate in a row direction;

the second electrode is provided on the first electrode in a column direction;

an insulating layer is provided between the first electrode and the second electrode;

wherein the second switching transistor is connected between the data line and the first electrode of the touch sensor; and

wherein when not performing touch scanning, the first electrode of the touch sensor has a predetermined potential, the multiple data lines are discharge to the predetermined potential during the second switching transistor turned on.

7. The driving method as claimed in claim 6, wherein the predefined interval is the scanning period of N frames, and each frame in the N frames comprises a first period performing a touch scanning and a second period performing a display scanning, wherein, N is a positive integer.

8. The driving method as claimed in claim 6, wherein the gate driver applies a VGH signal to the gate line during the first switching transistor turned on.