Display device and touch panel

Patent metadata

Field	Value
Publication number	US-11262867-B2
Application number	US-202117217058-A
Country	US
Kind code	B2
Filing date	Mar 30, 2021
Priority date	Mar 30, 2020
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A technology which can improve the accuracy of touch detection is proposed. A display device includes: a touch panel including plural drive electrodes and plural detection electrodes; plural peripheral wirings; and plural switching elements each of which is disposed between a detection electrode and the corresponding peripheral wiring and that is connected to the detection electrode and the corresponding peripheral electrode. The touch panel executes detection by means of a mutual detection scheme using the plural drive electrodes and the plural detection electrodes. In a condition in which a predefined voltage is applied to the peripheral wirings when the plural switching elements are in an off-state, the voltages of the drive electrodes are changed, and subsequently a condition in which the changes of the voltages of the drive electrodes can be detected from the peripheral wirings is set, and the switching elements are turned from off to on.

First claim

What is claimed is:

1. A display device comprising:
a touch panel including a plurality of drive electrodes and a plurality of detection electrodes;
a plurality of peripheral wirings; and
a plurality of switching elements each of which is disposed between a detection electrode and the corresponding peripheral wiring and that is connected to the detection electrode and the corresponding peripheral electrode,
wherein the touch panel executes detection by a mutual detection scheme using the plurality of drive electrodes and the plurality of detection electrodes, and
in a condition in which a predefined voltage is applied to the peripheral wirings when the plurality of switching elements are in an off-state, the voltages of the plurality of drive electrodes are changed, and

subsequently a condition in which the changes of the voltages of the plurality of drive electrodes can be detected from the peripheral wirings is set, and the plurality of switching elements are turned from off to on.

2. The display device according to claim 1 ,
wherein the plurality of the drive electrodes and the plurality of detection electrodes are disposed in a display region,
the plurality of peripheral wirings are disposed in a peripheral region in the outside of the display region, and
the plurality of switching elements are disposed between the plurality of peripheral wirings and the plurality of detection electrodes.

3. The display device according to claim 1 ,
wherein each of the plurality of drive electrodes extends in a second direction while the plurality of drive electrodes are arranged in the first direction which is different from the second direction,
each of the plurality of detection electrodes extends in the first direction while the plurality of detection electrodes are arranged in the second direction,
each of the plurality of peripheral wirings extends in the second direction while the plurality of peripheral wirings are arranged in the first direction, and
the plurality of switching elements are arranged between the plurality of peripheral wirings and the plurality of detection electrodes in the second direction.

4. The display device according to claim 3 , further comprising a plurality of terminals that are arranged in one end of the touch panel and that are connected to the plurality of peripheral wirings,
wherein a control circuit is connected to the plurality of terminals.

5. The display device according to claim 4 , wherein the plurality of terminals are arranged in the first direction.

6. The display device according to claim 4 , wherein the plurality of terminals are arranged in the second direction.

7. A touch panel comprising:
a plurality of drive electrodes;
a plurality of detection electrodes;
a plurality of peripheral wrings; and
a plurality of switching elements each of which is disposed between a detection electrode and the corresponding peripheral wiring and that is connected to the detection electrode and the corresponding peripheral electrode,
wherein detection is executed by a mutual detection scheme using the plurality of drive electrodes and the plurality of detection electrodes, and
in a condition in which a predefined voltage is applied to a peripheral wiring connected to a detection electrode to be used for detection when the plurality of switching elements are in an off-state, the voltages of the plurality of drive electrodes are changed, and subsequently the switching elements are turned from off to on.

8. The touch panel according to claim 7 ,
wherein the plurality of drive electrodes and the plurality of detection electrodes are disposed in a detection region,
the plurality of peripheral wirings are disposed in a peripheral region in the outside of the detection region, and
the plurality of switching elements are disposed between the plurality of peripheral wirings and the plurality of detection electrodes.

9. The touch panel according to claim 7 ,
wherein each of the plurality of drive electrodes extends in a second direction while the plurality of drive electrodes are arranged in a first direction which is different from the second direction,
each of the plurality of detection electrodes extends in the first direction while the plurality of detection electrodes are arranged in the second direction, and
each of the plurality of peripheral wirings extends in the second direction while the plurality of peripheral wirings are arranged in the first direction.

10. The touch panel according to claim 9 , further comprising a substrate,
wherein the substrate includes a plurality of terminals that are arranged in one end of the substrate and that are connected to the plurality of peripheral wirings, and
a control circuit is connected to the plurality of terminals.

11. The touch panel according to claim 10 , wherein the plurality of terminals are arranged in the first direction.

12. The touch panel according to claim 10 , wherein the plurality of terminals are arranged in the second direction.

Assignees

• Japan Display Inc

Inventors

• Fujisawa Akihiko
• Abe Daichi
• Ito Kaoru

Classifications

• G06F3/04166

  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 title

• G06F3/04164 Primary

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

• G06V40/1306

  non-optical, e.g. ultrasonic or capacitive sensing · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title