Display device

• US 10,642,111 B2
• Filed: 04/04/2018
• Issued: 05/05/2020
• Est. Priority Date: 04/10/2017
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Koide, Gen
• Primary Examiner(s): Kohlman, Christopher J
• Application Number:
  US15/944,881
• Publication Number:
  US 20180292698A1
• Time in Patent Office: 762 Days
• Field of Search: None
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2201/56 Substrates having a particular shape, e.g. non-rectangular
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3648 : using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3655 : Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

According to one embodiment, a display device includes a first common electrode and a second common electrode arranged in a first direction, a first switch unit selectively supplying a first drive signal or a second drive signal different from the first drive signal to the first common electrode, and a second switch unit selectively supplying the first drive signal or the second drive signal to the second common electrode, wherein the second common electrode and the first switch unit are arranged in a second direction intersecting the first direction, the first switch unit comprises a first switch circuit and a second switch circuit arranged in the second direction.

Claims

1. A display device comprising:

a first common electrode and a second common electrode arranged in a first direction;

a first switch unit selectively supplying a first drive signal or a second drive signal different from the first drive signal to the first common electrode; and

a second switch unit selectively supplying the first drive signal or the second drive signal to the second common electrode;

a first drive signal line supplied with the first drive signal; and

a second drive signal line supplied with the second drive signal, wherein

the second common electrode and the first switch unit are arranged in a second direction intersecting the first direction,

the first switch unit comprises a first switch circuit and a second switch circuit arranged in the second direction,

the first switch circuit comprises a first switch comprising parallel-connected first to third transistors and a second switch comprising parallel-connected fourth to sixth transistors,

an input terminal of each of the first to third transistors is connected to the first drive signal line,

an output terminal of each of the first to third transistors is connected to the first common electrode,

an input terminal of each of the fourth to sixth transistors is connected to the second drive signal line, and

an output terminal of each of the fourth to sixth transistors is connected to the first common electrode.

2. The display device of claim 1, wherein

the second switch unit comprises a third switch circuit and a fourth switch circuit arranged in the first direction, and

the third switch circuit and the second common electrode are arranged in the second direction, and the fourth switch circuit and the second common electrode are arranged in the second direction.

3. The display device of claim 2, further comprising:

a signal line located in a display area;

a selector circuit located between the second common electrode and the second switch unit in a peripheral area surrounding the display area, and connected to the signal line; and

a video line located between the third switch circuit and the fourth switch circuit and connected to the selector circuit.

4. A display device comprising:

a first common electrode and a second common electrode arranged in a first direction;

a first switch unit selectively supplying a first drive signal or a second drive signal different from the first drive signal to the first common electrode; and

a second switch unit selectively supplying the first drive signal or the second drive signal to the second common electrode;

a first selector circuit and a second selector circuit located in a peripheral area surrounding a display area, wherein

the second common electrode and the first switch unit are arranged in a second direction intersecting the first direction,

the first switch unit comprises a first switch circuit and a second switch circuit arranged in the second direction,

the first selector circuit is closer to the display area than to the second selector circuit,

the first common electrode includes an extending portion extending to the peripheral area, and

an edge of the extending portion is formed in a step shape along the first selector circuit and the second selector circuit.

5. The display device of claim 4, further comprising:

a first conductive layer overlapping the first selector circuit and the second selector circuit and being supplied with the first drive signal.

6. The display device of claim 5, wherein

the first conductive layer includes an overlap portion overlapping the first common electrode and a non-overlap portion remote from the first common electrode, in planar view.

7. The display device of claim 6, further comprising:

a first line intersecting the overlap portion; and

a second line intersecting the non-overlap portion and being supplied with a signal different from a signal supplied to the first line.

8. The display device of claim 7, wherein

the first common electrode has a first width overlapping the first line and a second width overlapping the second line in the extending portion, and

the second width is smaller than the first width.

9. The display device of claim 5, further comprising:

a second conductive layer of a fixed potential located at a position different from the first conductive layer in the peripheral area.

10. The display device of claim 9, further comprising:

a first substrate comprising the first common electrode and the second common electrode;

a second substrate opposed to the first substrate;

a sealing member attaching the first substrate to the second substrate; and

a third conductive layer overlapping the sealing member,

wherein

the second conductive layer is located between the first conductive layer and the third conductive layer and has a same potential as the third conductive layer.

11. The display device of claim 10, wherein

the first conductive layer, the second conductive layer, and the third conductive layer are located in a same layer, formed of a same material, and located in the layer different from the first common electrode.

12. The display device of claim 10, wherein

the first substrate further comprises a pixel electrode, and

the first conductive layer, the second conductive layer, the third conductive layer, and the pixel electrode are located in a same layer and formed of a same material.

13. The display device of claim 12, wherein

the first conductive layer, the second conductive layer, and the third conductive layer are located along a first round portion of the display area.

14. The display device of claim 13, wherein

the second substrate includes a second round portion close to the first round portion,

the first substrate includes a third round portion close to the second round portion, and

the second round portion is located between the first round portion and the third round portion in planar view.

15. The display device of claim 14, wherein

the third round portion has a first radius of curvature,

the second round portion has a second radius of curvature smaller than the first radius of curvature, and

the first round portion has a third radius of curvature smaller than the first radius of curvature and larger than the second radius of curvature.

16. The display device of claim 13, wherein

as regards an interval between the sealing member and the first round portion in the second direction, an interval including an area where the first switch unit is disposed is larger than an interval including an area where the second switch unit is disposed.

17. The display device of claim 9, wherein

the first conductive layer and the second conductive layer are located in a same layer,

the second conductive layer is remote from the first conductive layer, and

a shield electrode electrically connected to the first conductive layer is disposed in a gap between the first conductive layer and the second conductive layer.

18. The display device of claim 17, wherein

the shield electrode and the first common electrode are located in a same layer and formed of a same material.

19. The display device of claim 4, wherein

the extending portion is electrically connected to a metal layer.