DISPLAY DEVICE

• US 20200133438A1
• Filed: 08/26/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Display Company Limited (Samsung Group)
• Inventors: KIM, Hyunwoong, KIM, Kwang-min, Kim, Kiwook, KIM, Yangwan, NA, Jisu
• Granted Patent: US 11,550,437 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

A display device including a display panel and an input sensor disposed on the display panel and including signal line groups arranged in a wiring region, and first and second sensing electrodes disposed in a sensing region, each of the first and second sensing electrodes having one end electrically connected to a corresponding signal line, in which the second sensing electrodes have a greater length than the first sensing electrodes, the signal line groups include first and second signal line groups electrically connected to the first and second sensing electrodes, respectively, each of the first sensing electrodes includes first bridge patterns overlapping the second sensing electrodes and disposed on a different layer from the second sensing electrodes, and one of the first sensing electrodes or the second sensing electrodes are configured to receive a sinusoidal signal.

Claims

1. A display device comprising:

a display panel; and

an input sensor disposed on the display panel and including a sensing region and a wiring region outside the sensing region, the input sensor comprising;

signal line groups arranged in the wiring region; and

first sensing electrodes and second sensing electrodes disposed in the sensing region, each of the first sensing electrodes and second sensing electrodes having one end electrically connected to a corresponding signal line of the signal line groups, wherein;

the second sensing electrodes have a greater length than the first sensing electrodes;

the signal line groups comprise a first signal line group electrically connected to the first sensing electrodes and a second signal line group electrically connected to the second sensing electrodes;

each of the first sensing electrodes comprises first bridge patterns overlapping the second sensing electrodes and disposed on a different layer from the second sensing electrodes; and

one of the first sensing electrodes or the second sensing electrodes are configured to receive a sinusoidal signal.

2. The display device of claim 1, wherein the other one of the first sensing electrodes and the second sensing electrodes are configured to provide a sensing signal corresponding to the sinusoidal signal to a sensing circuit.

3. The display device of claim 1, wherein each of the second sensing electrodes has a single body shape.

4. The display device of claim 1, wherein:

the display panel comprises a display region corresponding to the sensing region and a non-display region corresponding to the wiring region;

the display region comprises light emission regions and non-light emission regions; and

each of the first sensing electrodes has openings that correspond to the light emission regions.

5. The display device of claim 1, wherein at least a portion of the corresponding signal line of the signal line groups is disposed on the same layer as the second sensing electrodes.

6. The display device of claim 1, wherein the input sensor further comprises an insulating layer disposed between the first bridge patterns and the second sensing electrodes and covering the sensing region.

7. The display device of claim 1, wherein:

the first signal line group comprises;

first side signal lines electrically connected to odd-numbered sensing electrodes among the first sensing electrodes; and

second side signal lines electrically connected to even-numbered sensing electrodes among the first sensing electrodes; and

the first and second signal lines are spaced apart from each other with the sensing region therebetween along an extension direction of the first sensing electrodes.

8. The display device of claim 1, wherein the input sensor further comprises:

first dummy patterns respectively arranged inside the first sensing electrodes; and

second dummy patterns respectively arranged inside the second sensing electrodes.

9. The display device of claim 8, wherein the input sensor further comprises second bridge patterns connecting the first dummy patterns.

10. The display device of claim 9, wherein:

at least one of the first dummy patterns comprises a center part and extension parts arranged on both sides of the center part along an extension direction of the first sensing electrodes; and

each of the extension parts is connected to a corresponding second bridge pattern among the second bridge patterns.

11. The display device of claim 9, wherein the first bridge patterns and the second bridge patterns are disposed on the same layer.

12. The display device of claim 9, wherein:

the second bridge patterns are arranged in correspondence with the first bridge patterns; and

the second bridge patterns have a greater length than a corresponding first bridge pattern among the first bridge patterns.

13. The display device of claim 9, wherein the input sensor further comprises a dummy signal line connected to an outermost first dummy pattern among the first dummy patterns along an extension direction of the first sensing electrodes.

14. The display device of claim 13, wherein:

the input sensor further comprises third bridge patterns intersecting the dummy signal line and insulated from the dummy signal line; and

the third bridge patterns connect the first sensing electrodes and signal lines of the first signal line group.

15. The display device of claim 1, wherein the display device further includes a notch region recessed inwardly in a plan view.

16. The display device of claim 1, wherein:

the display panel comprises a base layer, a circuit element layer disposed on the base layer, a display element layer disposed on the circuit element layer, and an upper insulating layer disposed on the display element layer; and

the display device further includes a signal transmission region in which at least a part of the base layer, the circuit element layer, the display element layer, and the upper insulating layer is removed.

17. The display device of claim 1, wherein the input sensor is directly disposed on the display panel.

18. A display device comprising:

a display panel; and

an input sensor disposed on the display panel, the input sensor comprising;

a first sensing electrode; and

a second sensing electrode intersecting the first sensing electrode and having a greater length than the first sensing electrode,

wherein;

the first sensing electrode comprises;

sensor parts disposed on the same layer as the second sensing electrode; and

bridge patterns disposed on a different layer from the second sensing electrode, at least one of the bridge patterns overlapping the second sensing electrode; and

one of the first sensing electrode or the second sensing electrode is configured to receive a sinusoidal signal through one end thereof.

19. A display device comprising:

a display panel; and

an input sensor disposed on the display panel, the input sensor comprising;

an insulating layer;

a first sensing electrode; and

a second sensing electrode intersecting the first sensing electrode, having a greater length than the first sensing electrode, and having a single body shape,

wherein;

the first sensing electrode comprises first parts disposed on the insulating layer, and second parts disposed under the insulating layer and connected to the first parts through contact holes penetrating the insulating layer; and

one of the first sensing electrode or the second sensing electrode is configured to receive a sinusoidal signal through one end thereof.

20. The display device of claim 19, wherein the second sensing electrode is disposed on the insulating layer.

21. The display device of claim 19, wherein a first end of the second sensing electrode is connected to a signal line and a second end thereof is electrically isolated.