Display device

• US 10,474,264 B2
• Filed: 03/07/2017
• Issued: 11/12/2019
• Est. Priority Date: 09/06/2016
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Kwan Ho, Ku, Ja Seung, Park, Jin Hee, Son, Ho Seok, Lee, Jang Doo, Cho, Sung Yeon, Cho, Jae Hyung
• Primary Examiner(s): Pham, Viet D
• Application Number:
  US15/451,609
• Publication Number:
  US 20180067597A1
• Time in Patent Office: 980 Days
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• 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 3/0412 Digitisers structurally integrated in a display
• 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

Abstract

A display device, including: a substrate; an electrode unit provided on the substrate; an emission layer driven by the electrode unit; a capacitive touch sensor provided on the electrode unit; and a conductive layer provided on the touch sensor.

Claims

1. A display device, comprising:

a substrate;

a first electrode disposed on the substrate;

an emission layer on the first electrode;

a second electrode on the emission layer;

a capacitive touch sensor disposed on the second electrode; and

a conductive layer disposed on the capacitive touch sensor,

wherein;

the capacitive touch sensor comprises a plurality of touch electrodes having a mesh form;

the touch electrodes comprise a first touch electrode and a second touch electrode;

the second touch electrode is spaced apart from the first touch electrode and forms a capacitance with the first touch electrode;

a second capacitance is formed between the second electrode and the touch electrodes;

a third capacitance is formed between the conductive layer and the touch electrodes; and

one of the first and second touch electrodes is a driving electrode, and the remaining one of the first and second touch electrodes is a receiving electrode.

2. The display device of claim 1, further comprising a sensor control unit to receive corresponding values of a capacitance between the touch electrodes and a variation of the capacitance between the touch electrodes,

wherein the variation of the capacitance between the touch electrodes is changed by a capacitance between the touch electrodes and the conductive layer and by a capacitance between the touch electrodes and the second electrode when a touch is made by a user.

3. The display device of claim 1, wherein the conductive layer has a surface resistance in a range of 10⁵ Ω

/sq to 10⁹ Ω

/sq.

4. The display device of claim 3, wherein the conductive layer has a thickness in a range of 100 Å

to 2,000 Å

.

5. The display device of claim 3, wherein the conductive layer comprises a conductive polymer.

6. The display device of claim 5, wherein the conductive polymer comprises at least one of polythiophene, polypyrrole, polyaniline, polyacetylene, polyphenylenether, and a mixture thereof.

7. The display device of claim 6, wherein the conductive polymer is PEDOT:

PSS.

8. The display device of claim 1, further comprising a window disposed between the touch sensor and the conductive layer.

9. The display device of claim 8, wherein the window is formed of glass or a polymer resin.

10. The display device of claim 8, further comprising an anti-reflecting layer disposed between the touch sensor and the conductive layer.

11. The display device of claim 8, further comprising an insulating layer disposed between the touch sensor and the window.

12. The display device of claim 11, wherein the insulating member comprises a first insulating member and a second insulating member, which are sequentially laminated on the touch sensor.

13. The display device of claim 1, further comprising a window disposed on the conductive layer.

14. The display device of claim 13, further comprising an insulating member disposed between the conductive layer and the window.

15. The display device of claim 1, wherein the display device has flexibility.

16. A display device, comprising:

a display part comprising a display unit configured to display an image, and a first electrode and a second electrode configured to control a display of an image of the display unit;

a capacitive touch sensor disposed on the display part, the capacitive touch sensor comprising a plurality of touch electrodes having a mesh form; and

a conductive layer disposed on the capacitive touch sensor,

wherein;

the touch electrodes comprise a first touch electrode and a second touch electrode;

the second touch electrode is spaced apart from the first touch electrode and forms a capacitance with the first touch electrode;

a second capacitance is formed between the second electrode and the touch electrodes;

a third capacitance is formed between the conductive layer and the touch electrodes; and

one of the first and second touch electrodes is a driving electrode, and the remaining one of the first and second touch electrodes is a receiving electrode.

17. A display device, comprising:

a display part comprising a display unit configured to display an image, and one or more electrodes configured to control a display of an image of the display unit;

a capacitive touch sensor disposed on the display part and configured to detect a touch of a user;

a conductive layer disposed on the capacitive touch sensor; and

a sensor control unit configured to receive corresponding values of a first capacitance of the capacitive touch sensor and a variation of the first capacitance of the capacitive touch sensor,

wherein;

the capacitive touch sensor comprises a first touch electrode and a second touch electrode;

the second touch electrode is spaced apart from the first touch electrode and forms the first capacitance with the first touch electrode;

one of the first and second touch electrodes is a driving electrode, and the remaining one of the first and second touch electrodes is a receiving electrode; and

the variation of the first capacitance is changed by a third capacitance between the capacitive touch sensor and the conductive layer and by a second capacitance between the capacitive touch sensor and one of the electrodes of the display part when a touch is made by a user.

18. The display device of claim 17, wherein the display part comprises:

a first electrode disposed on a substrate;

an image displaying layer disposed on the first electrode; and

a second electrode disposed on the image displaying layer.