Touch panel, driving method thereof and display device

Patent metadata

Field	Value
Publication number	US-11269451-B2
Application number	US-202016903531-A
Country	US
Kind code	B2
Filing date	Jun 17, 2020
Priority date	Dec 18, 2019
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

The present disclosure discloses a touch panel, a driving method thereof and a display device. A touch signal multiplexer is adopted to load touch signals to touch signal lines, and one pad is at least correspondingly electrically connected with two touch signal lines; in addition, a load compensation circuit is set; and while the pad loads the touch signals to one of the touch signal lines electrically connected with the pad, the load compensation circuit loads compensation signals to other touch signal lines electrically connected with the pad without the loaded touch signals.

First claim

What is claimed is:

1. A touch panel, comprising:
a touch area, comprising a plurality of touch signal lines; and
a non-touch area surrounding the touch area; wherein
the non-touch area comprises:
a touch signal multiplexer, comprising a plurality of selection circuits, wherein each of the selection circuits comprises an input and at least two outputs, and the at least two outputs are electrically connected with the respective touch signal lines in one-to-one correspondence;
a compensator, comprising a plurality of load compensation circuits in one-to-one correspondence with the selection circuits, wherein each of the load compensation circuits and its corresponding selection circuit are electrically connected with same touch signal lines; and
a plurality of pads, electrically connected with the respective inputs of the selection circuits in one-to-one correspondence; wherein

during a touch time period,
each of the selection circuits is configured to load touch signals to the respective touch signal lines electrically connected with the selection circuit based on time division through a pad electrically connected with the selection circuit; and
a load compensation circuit, corresponding to the selection circuit, is configured to, while the selection circuit loads the touch signals to one of the touch signal lines, load compensation signals to other of the touch signal lines.

2. The touch panel according to claim 1 , further comprising:
at least two first control signal lines; wherein
each of the selection circuits further comprises:
first switching transistors in one-to-one correspondence with the touch signal lines; wherein gates of the first switching transistors are electrically connected with different first control signal lines, first terminals of the first switching transistors are electrically connected with corresponding touch signal lines in one-to-one correspondence, and second terminals of the first switching transistors are electrically connected with a same pad.

3. The touch panel according to claim 2 , further comprising:
at least two second control signal lines and a compensation signal line; wherein
each of the load compensation circuits comprises:
second switching transistors in one-to-one correspondence with the touch signal lines; wherein gates of the second switching transistors are electrically connected with different second control signal lines, first terminals of the second switching transistors are electrically connected with corresponding touch signal lines in one-to-one correspondence, and second terminals of the second switching transistors are electrically connected with the compensation signal line.

4. The touch panel according to claim 3 , wherein
for the first switching transistor and the second switching transistor electrically connected with a same touch signal line at a same time, the second switching transistor is turned off while the first switching transistor is turned on, and the second switching transistor is turned on while the first switching transistor is off.

5. The touch panel according to claim 3 , wherein
the second terminals of all the second switching transistors are electrically connected with a same compensation signal line.

6. The touch panel according to claim 1 , wherein
the compensator is between the touch signal multiplexer and the touch area.

7. The touch panel according to claim 1 , further comprising:
a plurality of touch electrodes, electrically connected with the touch signal lines in one-to-one correspondence; wherein each of the selection circuits is electrically connected with two touch signal lines, the load compensation circuit corresponding to the selection circuit is electrically connected with same two touch signal lines, and two touch electrodes correspondingly electrically connected with the two touch signal lines are in a same row or a same column.

8. The touch panel according to claim 1 , further comprising:
a plurality of touch electrodes, electrically connected with the touch signal lines in one-to-one correspondence;
each of the selection circuits is electrically connected with three touch signal lines, the load compensation circuit corresponding to the selection circuit is electrically connected with same three touch signal lines, and three touch electrodes correspondingly electrically connected with the three touch signal lines are in a same row or a same column.

9. A display device, comprising a display panel and a touch panel being stacked, wherein the touch panel is the touch panel according to claim 1 .

10. The display device according to claim 9 , wherein a display area of the display panel comprises a plurality of common electrode blocks, and the common electrode blocks are multiplexed as touch electrodes of the touch panel.

11. The display device according to claim 9 , wherein a non-display area of the display panel comprises a first driving chip and a second driving chip, one half of the serially arranged pads in all the pads are electrically connected with the first driving chip, and the other half of the serially arranged pads in all the pads are electrically connected with the second driving chip.

12. A driving method of the touch panel according to claim 1 , comprising:
loading, by the selection circuit, the touch signals to the touch signal lines through the pad based on the time division during the touch time period; and
loading, by the load compensation circuit, while the selection circuit loads the touch signals to one of the touch signal lines, the compensation signals to other of the touch signal lines.

13. The driving method of the touch panel according to claim 12 , further comprising:
loading, by the selection circuit, the touch signals to a first touch signal line of the touch signal lines through the pad in a first time period;
loading, by the load compensation circuit, the compensation signals to a second touch signal line of the touch signal lines through the compensation signal line in the first time period;
loading, by the selection circuit, the touch signals to the second touch signal line through the pad in a second time period; and
loading, by the load compensation circuit, the compensation signals to the first touch signal line through the compensation signal line in the second time period; wherein
the touch time period is divided into the first time period and the second time period.

14. The driving method of the touch panel according to claim 12 , further comprising:
loading, by the selection circuit, the touch signals to a first touch signal line of the touch signal lines through the pad in a first time period;
loading, by the load compensation circuit, the compensation signals to a second touch signal line and a third touch signal line of the touch signal lines through the compensation signal line in the first time period;
loading, by the selection circuit, the touch signals to the second touch signal line through the pad in a second time period;
loading, by the load compensation circuit, the compensation signals to the first touch signal line and the third touch signal line through the compensation signal line in the second time period;
loading, by the selection circuit, the touch signals to the third touch signal line through the pad in a third time period; and
loading, by the load compensation circuit, the compensation signals to the first touch signal line and the second touch signal line through the compensation signal line in the third time period; wherein
the touch time period is divided into the first time period, the second time period and the third time period.

Assignees

• Hefei Boe Optoelectronics Tech
• Boe Technology Group Co Ltd

Inventors

• Fang Zhixiang
• Zheng Liangliang
• Yang Guanglei
• Hu Xuxu
• Ding Peng
• Wang Meng

Classifications

• G06F3/04164 Primary

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title

• G06F3/041661 Primary

  using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window · CPC title