Display device and watch

Patent metadata

Field	Value
Publication number	US-11899883-B2
Application number	US-202217947559-A
Country	US
Kind code	B2
Filing date	Sep 19, 2022
Priority date	Mar 19, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

According to one embodiment, a display device includes a display area, a plurality of sensor electrodes and a shield electrode. The display panel includes a first substrate, a second substrate opposed to the first substrate, a liquid crystal layer sealed between the first substrate and the second substrate, a pixel electrode, and a counter-electrode. The plurality of sensor electrodes are arranged to surround the display area. The shield electrode is arranged between the plurality of sensor electrodes and the pixel electrode or the counter-electrode located closest to a boundary between the display area and a non-display area surrounding the display area, in planar view. A predetermined reference voltage is applied to the shield electrode.

First claim

What is claimed is:

1. A display device comprising:
a display area comprising a first substrate, a second substrate opposed to the first substrate, a liquid crystal layer sealed between the first substrate and the second substrate, a pixel electrode, and a counter-electrode;
a seal configured to seal the liquid crystal layer between the first substrate and the second substrate;
a plurality of sensor electrodes arranged to surround the display area; and
a shield electrode which is arranged between the plurality of sensor electrodes and the pixel electrode or the counter-electrode located closest to a boundary between the display area and a non-display area surrounding the display area, and to which a predetermined reference voltage is applied, in planar view, wherein
the shield electrode is arranged to surround the display area,
the plurality of sensor electrodes are arranged to surround the shield electrode, and
at least one of the shield electrode, the detection electrode, or a drive electrode overlaps with the seal.

2. The display device of claim 1 , wherein
the pixel electrode is arranged on the first substrate, and
the counter-electrode and the plurality of sensor electrodes are arranged on the second substrate.

3. The display device of claim 1 , wherein
the pixel electrode and the counter-electrode are arranged on the first substrate, and
the plurality of sensor electrodes are arranged on the second substrate.

4. The display device of claim 1 , further comprising:
a drive electrode arranged to surround the plurality of sensor electrodes, wherein
when a drive signal is input to the drive electrode, the display device detects an approaching or contacting object in a mutual-capacitive scheme, based on detection signals output from the plurality of sensor electrodes.

5. The display device of claim 1 , further comprising:
a drive electrode arranged to surround the display area, wherein
the plurality of sensor electrodes are arranged to surround the drive electrode, and
when a drive signal is input to the drive electrode, the display device detects an approaching or contacting object in a mutual-capacitive scheme, based on detection signals output from the plurality of sensor electrodes.

6. The display device of claim 1 , wherein
at least one of the plurality of sensor electrodes functions as a drive electrode, and at least one of the plurality of sensor electrodes functions as a detection electrode, and
when a drive signal is input to the sensor electrode which functions as the drive electrode, the display device detects an approaching or contacting object in a mutual-capacitive scheme, based on a detection signal output from the sensor electrode which functions as the detection electrode.

7. The display device of claim 1 , wherein
the display device detects an approaching or contacting object in a self-capacitive scheme, based on detection signals output from the plurality of sensor electrodes, in accordance with drive signals input to the plurality of sensor electrodes.

8. The display device of claim 1 , wherein
a width of the shield electrode is set to any value in a range of 1 μm to 300 μm.

9. The display device of claim 8 , wherein
a width of the shield electrode is set to any value in a range of 10 μm to 100 μm.

10. A watch comprising the display device of claim 1 .

11. The display device of claim 1 , wherein
the display device has a space with a width in a range of 10 μm to 400 μm between the plurality of sensor electrodes and the pixel electrode or the counter-electrode which is located closest to the boundary between the display area and the non-display area surrounding the display area, in planar view.

12. The display device of claim 11 , wherein
the width of the space is set to any value in a range of 50 μm to 200 μm.

13. The display device of claim 11 , wherein
the pixel electrode is arranged on the first substrate, and
the counter-electrode and the plurality of sensor electrodes are arranged on the second substrate.

14. The display device of claim 11 , wherein
the pixel electrode and the counter-electrode are arranged on the first substrate, and
the plurality of sensor electrodes are arranged on the second substrate.

15. The display device of claim 11 , wherein
the drive electrode arranged to surround the plurality of sensor electrodes, and
when a drive signal is input to the drive electrode, the display device detects an approaching or contacting object in a mutual-capacitive scheme, based on detection signals output from the plurality of sensor electrodes.

16. The display device of claim 11 ,
wherein
the drive electrode arranged to surround the display area,
the plurality of sensor electrodes are arranged to surround the drive electrode, and
when a drive signal is input to the drive electrode, the display device detects an approaching or contacting object in a mutual-capacitive scheme, based on detection signals output from the plurality of sensor electrodes.

17. The display device of claim 11 , wherein
at least one of the plurality of sensor electrodes functions as the drive electrode, and at least one of the plurality of sensor electrodes functions as a detection electrode, and
when a drive signal is input to the sensor electrode which functions as the drive electrode, the display device detects an approaching or contacting object in a mutual-capacitive scheme, based on a detection signal output from the sensor electrode which functions as the detection electrode.

18. The display device of claim 11 , wherein
the display device detects an approaching or contacting object in a self-capacitive scheme, based on detection signals output from the plurality of sensor electrodes, in accordance with drive signals input to the plurality of sensor electrodes.

19. A watch comprising the display device of claim 11 .

Assignees

• Japan Display Inc

Inventors

• Fujisawa Akihiko
• Ito Kaoru

Classifications

• G06F3/0418 Primary

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

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G04G17/04

  Mounting of electronic components · CPC title

• G04G21/08 Primary

  Touch switches specially adapted for time-pieces · CPC title