DISPLAY DEVICE INCLUDING TOUCH SENSOR

• US 20150145808A1
• Filed: 04/30/2014
• Published: 05/28/2015
• Est. Priority Date: 11/28/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Cho, Hyun-Wook, Kim, Tae Joon, Kim, Sang Kook
• Granted Patent: US 10,732,744 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• 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: H10K 59/40 OLEDs integrated with touch screens

Abstract

A display device including a touch sensor is disclosed. In one aspect, the display device includes a lower substrate and an upper substrate opposing each other and a first electrode, an electro-optical active layer, and a second electrode sequentially formed over the lower substrate. The display device also includes a plurality of touch electrodes formed below the upper substrate and over the second electrode and a shield layer interposed between the second electrode and the touch electrodes. The shield layer is formed at least partially of a conductive material.

Claims

1. A display device, comprising:

a lower substrate and an upper substrate opposing each other;

a first electrode, an electro-optical active layer, and a second electrode sequentially formed over the lower substrate;

a plurality of touch electrodes formed below the upper substrate and over the second electrode; and

a shield layer interposed between the second electrode and the touch electrodes,

wherein the shield layer is formed of a conductive material.

2. The display device of claim 1, wherein each of i) the shield layer and ii) at least one of the touch electrodes is configured to receive a driving signal.

3. The display device of claim 2, further comprising an insulating layer interposed between the shield layer and the touch electrodes.

4. The display device of claim 3, wherein the shield layer is formed of a transparent conductive material.

5. The display device of claim 3, wherein the first electrode is a pixel electrode and wherein the second electrode is a common electrode.

6. The display device of claim 5, wherein the touch electrodes include a plurality of first touch electrodes and a plurality of second touch electrodes, wherein either the first or second touch electrodes are sensing input electrodes, and wherein the other electrodes are sensing output electrodes.

7. The display device of claim 6, wherein the sensing input electrodes are configured to receive the driving signal.

8. The display device of claim 6, wherein the sensing output electrodes are configured to receive the driving signal.

9. The display device of claim 6, wherein the first and second touch electrodes are separated from each other and do not overlap with each other.

10. The display device of claim 9, wherein the first touch electrodes are arranged in a first direction and electrically connected to each other via a plurality of first connectors and wherein the second touch electrodes are arranged in a second direction crossing the first direction and electrically connected to each other via a plurality of second connectors.

11. The display device of claim 10, further comprising an insulating layer interposed between the first and second connectors.

12. The display device of claim 11, wherein the first connectors are formed on the same layer as the first touch electrodes and wherein the first connectors are integrally formed with the first touch electrodes.

13. The display device of claim 1, wherein the upper substrate is formed at least partially of glass.

14. The display device of claim 13, wherein further comprising a sealant interposed between the lower and upper substrates to connect the lower substrate to the upper substrate.

15. The display device of claim 14, wherein the electro-optical active layer comprises a light-emitting member, wherein the first electrode is an anode, and wherein the second electrode is a cathode.

16. A method of driving a display device comprising a substrate, a plurality of pixels formed over the substrate, and a shield layer interposed between the pixels and the touch electrodes, the method comprising:

driving each of the shield layer and at least one of the touch electrodes with a driving signal.

17. The method of claim 16, wherein the shield layer is formed of a transparent conductive material.

18. The method of claim 16, wherein the display device further comprises an insulating layer interposed between the touch electrodes and the shield layer.

19. The method of claim 16, wherein the touch electrodes comprise a plurality of input electrodes and a plurality of output electrodes, wherein the input and output electrodes are spaced apart from each other, and wherein the driving comprises applying the driving signal to the input electrodes and the shield layer.

20. The method of claim 19, wherein the input electrodes are arranged in a first direction and electrically connected to each other via a plurality of first connectors and wherein the output electrodes are arranged in a second direction crossing the first direction and electrically connected to each other via a plurality of second connectors.