METHOD FOR DRIVING IN-CELL TOUCH PANEL, DRIVE DEVICE AND DISPLAY DEVICE

• US 20160266676A1
• Filed: 09/30/2014
• Published: 09/15/2016
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: WANG, Haisheng, DONG, Xue, LIU, Yingming, DING, Xiaoliang, YANG, Shengji, ZHAO, Weijie, LIU, Hongjuan, REN, Tao
• Granted Patent: US 9,746,973 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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 3/041662 using alternate mutual and self-capacitive scanning
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A method for driving an in-cell touch panel, a drive device and a display device are disclosed. The driving method includes: in a touch period, applying touch detection signals to self-capacitance electrodes, receiving feedback touch sensing signals, and determine a possible touch area provided with at least one self-capacitance electrode according to the variation of the touch sensing signals compared with the touch detection signals; subsequently, taking at least a portion of self-capacitance electrodes in the touch area as a first touch electrode, taking a self-capacitance electrode adjacent to the first touch electrode as a second touch electrode, and determining an accurate touch position according to the principle of the different amount of projection fields between the first touch electrodes and the second touch electrodes. The driving method can improve the touch detection accuracy.

Claims

1. A method for driving an in-cell touch panel, comprising:

in a touch period of time for displaying each frame of the touch panel, applying touch detection signals to self-capacitance electrodes connected with leads in the touch panel respectively through the leads, receiving touch sensing signals, obtained from feedback of the touch detection signals via the self-capacitance electrodes, respectively through the leads, and determining a touch area in the touch panel according to difference between the touch sensing signals and the touch detection signals and positions of the self-capacitance electrodes connected with the leads;

taking a self-capacitance electrode connected with a lead in the touch area as a first touch electrode, and taking a self-capacitance electrode adjacent to the first touch electrode as a second touch electrode;

applying touch scanning signals to the first touch electrode and receiving touch sensing signals obtained by coupling of the touch scanning signals via the second touch electrode;

or applying touch scanning signals to the second touch electrode and receiving touch sensing signals obtained by coupling of the touch scanning signals via the first touch electrode; and

determining a touch position in the touch area according to difference between the touch sensing signals and the touch scanning signals and positions of the first touch electrode and the second touch electrode.

2. The method according to claim 1, wherein if the self-capacitance electrodes in the touch area are determined to be connected with two leads respectively, the self-capacitance electrode connected with any one lead is taken as the first touch electrode and the self-capacitance electrode connected with the other lead is taken as the second touch electrode.

3. The method according to claim 1, wherein each lead in the touch panel is electrically connected with at least two adjacent self-capacitance electrodes, and the self-capacitance electrodes electrically connected with different leads do not overlap with each other;

and

the process of taking the self-capacitance electrode connected with the lead in the touch area as the first touch electrode and taking the self-capacitance electrode adjacent to the first touch electrode as the second touch electrode includes;

taking the self-capacitance electrodes adjacent to the first touch electrodes in a horizontal direction as the second touch electrodes where the self-capacitance electrodes in the touch area are determined to be each connected with one lead and the self-capacitance electrodes in the touch area are horizontally arranged;

or

taking the self-capacitance electrodes adjacent to the first touch electrodes in the vertical direction as the second touch electrodes where the self-capacitance electrodes in the touch area are determined to be each connected with one lead and the self-capacitance electrodes in the touch area are vertically arranged.

4. The method according to claim 2, further comprising:

taking other self-capacitance electrodes, in a column provided with the self-capacitance electrode taken as the first touch electrode, as first touch electrodes as well and taking other self-capacitance electrodes, in a column provided with the self-capacitance electrode taken as the second touch electrode, as second touch electrodes as well where the self-capacitance electrodes in the touch area are determined to be horizontally arranged;

or

taking other self-capacitance electrodes, in a row provided with the self-capacitance electrode taken as the first touch electrode, as first touch electrodes as well and taking other self-capacitance electrodes, in a row provided with the self-capacitance electrode taken as the second touch electrode, as second touch electrodes as well where the self-capacitance electrodes in the touch area are determined to be vertically arranged.

5. The method according to claim 1, wherein

the touch detection signals are applied to the self-capacitance electrodes connected with the leads in the touch panel respectively and sequentially through the leads;

or

the touch detection signals are applied to the self-capacitance electrodes connected with the leads in the touch panel respectively and simultaneously through the leads.

12. The method according to claim 3, further comprising:

taking other self-capacitance electrodes, in a column provided with the self-capacitance electrode taken as the first touch electrode, as first touch electrodes as well and taking other self-capacitance electrodes, in a column provided with the self-capacitance electrode taken as the second touch electrode, as second touch electrodes as well where the self-capacitance electrodes in the touch area are determined to be horizontally arranged;

or

taking other self-capacitance electrodes, in a row provided with the self-capacitance electrode taken as the first touch electrode, as first touch electrodes as well and taking other self-capacitance electrodes, in a row provided with the self-capacitance electrode taken as the second touch electrode, as second touch electrodes as well where the self-capacitance electrodes in the touch area are determined to be vertically arranged.

13. The method according to claim 2, wherein

the touch detection signals are applied to the self-capacitance electrodes connected with the leads in the touch panel respectively and sequentially through the leads;

or

the touch detection signals are applied to the self-capacitance electrodes connected with the leads in the touch panel respectively and simultaneously through the leads.

14. The method according to claim 3, wherein

the touch detection signals are applied to the self-capacitance electrodes connected with the leads in the touch panel respectively and sequentially through the leads;

or

the touch detection signals are applied to the self-capacitance electrodes connected with the leads in the touch panel respectively and simultaneously through the leads.

15. The method according to claim 4, wherein

the touch detection signals are applied to the self-capacitance electrodes connected with the leads in the touch panel respectively and sequentially through the leads;

or

the touch detection signals are applied to the self-capacitance electrodes connected with the leads in the touch panel respectively and simultaneously through the leads.

6. A drive device of an in-cell touch panel, comprising:

a touch detection chip configured to;

in a touch period of time for displaying each frame of the touch panel, apply touch detection signals to self-capacitance electrodes connected with leads in the touch panel respectively through the leads, receive touch sensing signals, obtained from feedback of the touch detection signals via the self-capacitance electrodes, respectively through the leads, and determine a touch area in the touch panel according to difference between the touch sensing signals and the touch detection signals transmitted on the same leads and positions of the self-capacitance electrodes connected with the leads;

take a self-capacitance electrode connected with a lead in the touch area as a first touch electrode, and take a self-capacitance electrode adjacent to the first touch electrode as a second touch electrode;

apply touch scanning signals to the first touch electrode and receive touch sensing signals obtained by coupling of the touch scanning signals via the second touch electrode;

or apply touch scanning signals to the second touch electrode and receive touch sensing signals obtained by coupling of the touch scanning signals via the first touch electrode; and

determine a touch position in the touch area according to difference between the touch sensing signals and the touch scanning signals and positions of the first touch electrode and the second touch electrode.

7. The drive device according to claim 6, wherein the touch detection chip is configured to take the self-capacitance electrode connected with any one lead as the first touch electrode and take the self-capacitance electrode connected with the other lead as the second touch electrode when determining that the self-capacitance electrodes in the touch area are respectively connected with two leads.

8. The drive device according to claim 6, wherein each lead in the touch panel is electrically connected with at least two adjacent self-capacitance electrodes, and the self-capacitance electrodes electrically connected with different leads do not overlap with each other;

and

the touch detection chip is configured to take the self-capacitance electrode adjacent to the first touch electrode in a horizontal direction as the second touch electrode when determining that the self-capacitance electrodes in the touch area are connected with one lead and the self-capacitance electrodes in the touch area are horizontally arranged, or take the self-capacitance electrode adjacent to the first touch electrode in a vertical direction as the second touch electrode when determining that the self-capacitance electrodes in the touch area are connected with one lead and the self-capacitance electrodes in the touch area are vertically arranged.

9. The drive device according to claim 7, wherein the drive detection chip is further configured to take other self-capacitance electrode, in a column provided with the self-capacitance electrode taken as the first touch electrode, as the first touch electrode as well and take other self-capacitance electrode, in a column provided with the self-capacitance electrode taken as the second touch electrode, as the second touch electrode as well when the self-capacitance electrodes in the touch area are determined to be horizontally arranged, or take other self-capacitance electrode, in a row provided with the self-capacitance electrode taken as the first touch electrode, as the first touch electrode as well and take other self-capacitance electrode, in a row provided with the self-capacitance electrode taken as the second touch electrode, as the second touch electrode as well when the self-capacitance electrodes in the touch area are determined to be vertically arranged.

10. The drive device according to claim 6, wherein the touch detection chip is configured to apply the touch detection signals to the self-capacitance electrodes connected with the leads in the touch panel respectively and sequentially through the leads, or apply the touch detection signals to the self-capacitance electrodes connected with the leads in the touch panel respectively and simultaneously through the leads.

11. A display device, comprising the drive device of the in-cell touch panel according to claim 6.

16. The drive device according to claim 8, wherein the drive detection chip is further configured to take other self-capacitance electrode, in a column provided with the self-capacitance electrode taken as the first touch electrode, as the first touch electrode as well and take other self-capacitance electrode, in a column provided with the self-capacitance electrode taken as the second touch electrode, as the second touch electrode as well when the self-capacitance electrodes in the touch area are determined to be horizontally arranged, or take other self-capacitance electrode, in a row provided with the self-capacitance electrode taken as the first touch electrode, as the first touch electrode as well and take other self-capacitance electrode, in a row provided with the self-capacitance electrode taken as the second touch electrode, as the second touch electrode as well when the self-capacitance electrodes in the touch area are determined to be vertically arranged.

17. The drive device according to claim 7, wherein the touch detection chip is configured to apply the touch detection signals to the self-capacitance electrodes connected with the leads in the touch panel respectively and sequentially through the leads, or apply the touch detection signals to the self-capacitance electrodes connected with the leads in the touch panel respectively and simultaneously through the leads.

18. The drive device according to claim 8, wherein the touch detection chip is configured to apply the touch detection signals to the self-capacitance electrodes connected with the leads in the touch panel respectively and sequentially through the leads, or apply the touch detection signals to the self-capacitance electrodes connected with the leads in the touch panel respectively and simultaneously through the leads.

19. The drive device according to claim 9, wherein the touch detection chip is configured to apply the touch detection signals to the self-capacitance electrodes connected with the leads in the touch panel respectively and sequentially through the leads, or apply the touch detection signals to the self-capacitance electrodes connected with the leads in the touch panel respectively and simultaneously through the leads.