Touch sensing structure and display device including the same

• US 9,733,770 B2
• Filed: 09/30/2014
• Issued: 08/15/2017
• Est. Priority Date: 04/14/2014
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Choi, Chung Sock, Kim, Soo Youn, Jang, Cheol, Song, Seung Yong, Park, Sang Hyun, Kang, Jin Koo, Kim, Seung Hun, Kim, Hyun Ho, Cho, Sang Hwan
• Primary Examiner(s): PATEL, PREMAL R
• Application Number:
  US14/503,049
• Publication Number:
  US 20150293560A1
• Time in Patent Office: 1,050 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 3/0412 Digitisers structurally integrated in a display
• 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

Abstract

A touch sensing structure and display device including the same are disclosed. In one aspect, the display device includes a display panel including a light-emitting region and a non-light-emitting region and a touch sensor formed over the display panel and including a plurality of sensing patterns. The display device also includes a destructive interference unit formed over the display panel and overlapping the touch sensor. The destructive interference unit includes a plurality of dielectric layers and a plurality of metal layers that are alternately stacked. At least one of the metal layers includes a plurality of metal patterns that are separated from each other.

Claims

1. A display device, comprising:

a display panel including a light-emitting region and a non-light-emitting region;

a touch sensor disposed over the display panel and including a plurality of sensing patterns; and

a destructive interference unit disposed over the display panel and overlapping the touch sensor, wherein the destructive interference unit includes a plurality of dielectric layers and a plurality of metal layers that are alternately stacked,

wherein at least one of the metal layers includes a plurality of metal patterns that are separated from each other, the metal patterns defining a plane,

wherein each of the metal patterns overlaps only one of the sensing patterns in a direction substantially perpendicular to the plane defined by the metal patterns, and

wherein each of the metal patterns is formed in a different plane than each of the sensing patterns.

2. The display device of claim 1, wherein the destructive interference unit comprises:

a first dielectric layer;

a first metal layer disposed below the first dielectric layer and including a plurality of first metal patterns that are separated from each other;

a second dielectric layer disposed below the first metal layer; and

a second metal layer disposed below the second dielectric layer and including a plurality of second metal patterns that are separated from each other,

wherein the second metal patterns respectively overlap the first metal patterns.

3. The display device of claim 2, wherein the area of each of the first and second metal patterns is substantially equal to or less than the area of each of the sensing patterns.

4. The display device of claim 2, wherein the second metal patterns are arranged to completely overlap the first metal patterns.

5. The display device of claim 2, wherein each of the sensing patterns overlaps one or more of the first metal patterns and one or more of the second metal patterns.

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

a third metal layer disposed below the second metal layer and including a plurality of third metal patterns that are separated from each other; and

a third dielectric layer interposed between the second metal layer and the third metal layer,

wherein the third metal patterns respectively overlap the first metal patterns and the second metal patterns.

7. The display device of claim 6, wherein the area of each of the third metal patterns is substantially equal to or less than the area of each of the sensing patterns.

8. The display device of claim 6, wherein the third metal patterns are arranged to completely overlap the first metal patterns and the second metal patterns.

9. The display device of claim 6, wherein each of the sensing patterns overlaps one or more of the first metal patterns, one or more of the second metal patterns, and one or more of the third metal patterns.

10. The display device of claim 1, wherein at least one of the metal layers comprises an opening overlapping the light-emitting region.

11. The display device of claim 1, further comprising an encapsulation member disposed over the display panel, wherein the touch sensor and the destructive interference unit are interposed between the encapsulation member and the display panel.

12. The display device of claim 1, further comprising an encapsulation member disposed over the display panel, wherein the destructive interference unit is interposed between the encapsulation member and the display panel and wherein the touch sensor is disposed over the encapsulation member.

13. The display device of claim 1, further comprising an encapsulation member disposed over the display panel, wherein the touch sensor and the destructive interference unit are disposed over the encapsulation member.

14. The display device of claim 1, wherein the touch sensor comprises:

a plurality of first electrodes each including a plurality of first sensing patterns connected to each other in a first direction; and

a plurality of second electrodes each including a plurality of second sensing patterns connected to each other in a second direction crossing the first direction.

15. The display device of claim 1, wherein each of the dielectric layers is formed of any one material selected from the following:

silicon oxide (SiO₂), titanium oxide (TiO₂), lithium fluoride (LiF), calcium fluoride (CaF₂), magnesium fluoride (MgF₂), silicon nitride (SiN_x), tantalum oxide (Ta₂O₅), niobium oxide (Nb₂O₅), silicon carbonitride (SiCN), molybdenum oxide (MoO_x), iron oxide (FeO_x), chromium oxide (CrO_x), and strontium oxide (SnO₂).

16. The display device of claim 1, wherein each of the metal layers is formed of any one material selected from the following:

chromium (Cr), molybdenum (Mo), tungsten (W), titanium (Ti), nickel (Ni), cobalt (Co), copper oxide (CuO), titanium nitride (TiN_x), and nickel sulfide (NiS).

17. A touch sensing structure, comprising:

a destructive interference unit including a plurality of dielectric layers and a plurality of metal layers that are alternately stacked; and

a touch sensor overlapping the destructive interference unit and including a plurality of sensing patterns,

wherein at least one of the metal layers includes a plurality of metal patterns that are separated from each other, the metal patterns defining a plane,

wherein each of the metal patterns overlaps only one of the sensing patterns in a direction substantially perpendicular to the plane defined by the metal patterns, and

wherein each of the metal patterns is formed in a different plane than each of the sensing patterns.

18. The touch sensing structure of claim 17, wherein the destructive interference unit comprises:

a first dielectric layer;

a first metal layer disposed below the first dielectric layer and including a plurality of first metal patterns that are separated from each other;

a second dielectric layer disposed below the first metal layer; and

a second metal layer disposed below the second dielectric layer and including a plurality of metal patterns that are separated from each other,

wherein the second metal patterns respectively overlap the first metal patterns, and

wherein each of the sensing patterns overlaps one or more of the first metal patterns and one or more of the second metal patterns.

19. The touch sensing structure of claim 18, further comprising:

a third metal layer disposed below the second metal layer and including a plurality of third metal patterns that are separated from each other; and

a third dielectric layer interposed between the second metal layer and the third metal layer,

wherein the third metal patterns respectively overlap the first metal patterns and the second metal patterns, and

wherein each of the sensing patterns overlaps one or more of the first metal patterns, one or more of the second metal patterns, and one or more of the third metal patterns.

20. The touch sensing structure of claim 17, wherein the touch sensor comprises:

a plurality of first electrodes each including a plurality of first sensing patterns connected to each other in a first direction; and

a plurality of second electrodes each including a plurality of second sensing patterns connected to each other in a second direction crossing the first direction.