Display device having a groove that partially accommodates sealing material and manufacturing method thereof

• US 9,882,163 B2
• Filed: 03/13/2015
• Issued: 01/30/2018
• Est. Priority Date: 10/10/2014
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Cheondeok
• Primary Examiner(s): Malsawma, Lex
• Assistant Examiner(s): OJEH, NDUKA E
• Application Number:
  US14/657,944
• Publication Number:
  US 20160104863A1
• Time in Patent Office: 1,054 Days
• Field of Search: 257 40, 257 88, 438 28, 313512, 349 58
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

A display device is disclosed. In one aspect, the device includes first and second substrates each including a display area and a non-display area around the display area, a plurality of pixels formed in the display area of the first substrate and an internal circuit unit formed in the non-display area of the first substrate and electrically connected to the pixels. The device further includes a sealing member formed between the non-display areas of the first and second substrates to surround the display areas. The sealing member includes a first portion and a second portion, the second portion surrounded by the first portion and at least partially overlapping the internal circuit unit, and a groove is formed in the second substrate at a position corresponding to the second portion of the sealing member.

Claims

1. A display device, comprising:

first and second substrates each comprising a display area and a non-display area surrounding the display area, wherein the second substrate has thicker and thinner portions that do not overlap each other, and wherein the thicker portion has a thickness greater than that of the thinner portion;

a plurality of pixels formed in the display area of the first substrate;

an internal circuit unit formed in the non-display area of the first substrate and electrically connected to the pixels;

an insulating layer interposed between and not directly contacting the first and second substrates, wherein the insulating layer at least partially overlaps the internal circuit unit in the depth dimension of the display device; and

a sealing member formed between the non-display areas of the first and second substrates to surround the display areas,

wherein the sealing member comprises a first portion not overlapping the internal circuit unit in the depth dimension of the display device and a second portion at least partially overlapping the internal circuit unit in the depth dimension of the display device,

wherein a groove is formed in the thinner portion of the second substrate at a position corresponding to the second portion of the sealing member, wherein the second portion of the sealing member completely fills the entirety of the groove, wherein the first portion of the sealing member is in direct physical contact with the thicker portion of the second substrate, wherein the second portion of the sealing member surrounds and directly contacts at least three sides of the insulating layer,

wherein a thickness of the thicker portion of the second substrate is equal to a thickness of a portion of the second substrate which is disposed over the display area,

wherein the insulating layer includes a top surface, a bottom surface opposing the top surface and facing the first substrate, first and second side surfaces opposing each other, and wherein the three sides of the insulating layer include the top surface, and the first and second side surfaces.

2. The display device of claim 1, wherein an upper part of the second portion is accommodated in the groove.

3. The display device of claim 1, wherein the first portion is a cured portion, and wherein the second portion is a non-cured portion.

4. The display device of claim 1, wherein the first portion has a height less than that of the second portion.

5. The display device of claim 1, further comprising a touch electrode pattern formed over the second substrate.

6. The display device of claim 5, wherein an end portion of the touch electrode pattern at least partially overlaps the second portion of the sealing member.

7. The display device of claim 5, wherein the touch electrode pattern is formed on a first surface of the second substrate, and wherein the groove is formed in a second surface of the second substrate, the second surface being opposite the first surface and facing the first substrate.

8. The display device of claim 1, wherein the non-display area of the first substrate comprises:

a sealing area in which the sealing member is formed; and

an internal circuit area in which the internal circuit unit is formed, wherein at least a portion of the sealing area is farther from the display area than the internal circuit area,

wherein the sealing area and the internal circuit area at least partially overlap each other,

wherein the first portion of the sealing member is formed in a region of the sealing area not overlapping the internal circuit area, and

wherein the second portion of the sealing member is formed in a region of the sealing area overlapping the internal circuit area.

9. A method of manufacturing a display device, the method comprising:

providing a first substrate, the first substrate comprising a display area in which a plurality of pixels are formed and a non-display area in which an internal circuit unit electrically connected to the pixels is formed, the non-display area surrounding the display area;

providing an insulating layer interposed between and not directly contacting the first and second substrates, wherein the insulating layer at least partially overlaps the internal circuit unit in the depth dimension of the display device;

forming a sealing material in the non-display area of the first substrate, a portion of the sealing material overlapping the internal circuit unit, wherein the sealing material comprises a first portion not overlapping the internal circuit unit in the depth dimension of the display device and a second portion at least partially overlapping the internal circuit unit in the depth dimension of the display device;

placing a second substrate above the first substrate, the second substrate having a groove formed at a position corresponding to the second portion of the sealing material, wherein the second portion of the sealing member completely fills the entirety of the groove, wherein the second substrate has thicker and thinner portions that do not overlap each other, wherein the thicker portion has a thickness greater than that of the thinner portion, wherein the first portion of the sealing member is in direct physical contact with the thicker portion of the second substrate, and wherein the second portion of the sealing material surrounds and directly contacts at least three sides of the insulating layer; and

curing the sealing material,

wherein a thickness of the thicker portion of the second substrate is equal to a thickness of a portion of the second substrate which is disposed over the display area,

wherein the insulating layer includes a top surface, a bottom surface opposing the top surface and facing the first substrate, first and second side surfaces opposing each other, and wherein the three sides of the insulating layer include the top surface, and the first and second side surfaces.

10. The method of claim 9, wherein the forming of the sealing material comprises:

applying paste comprising an inorganic material; and

drying and firing the paste to form the sealing material.

11. The method of claim 9,

wherein the first portion does not overlap the internal circuit unit and

wherein the second portion at least partially overlaps the internal circuit unit.

12. The method of claim 11, wherein the curing of the sealing material comprises curing the first portion by casting light to the first portion.

13. The method of claim 9, wherein the second substrate comprises a touch electrode pattern formed thereon.

14. The method of claim 13, wherein the touch electrode pattern is formed on a first surface of the second substrate, and wherein the groove is formed in a second surface of the second substrate opposite to the first surface.

15. The method of claim 13, wherein an end portion of the touch electrode pattern is formed above the second portion of the sealing member overlapping the internal circuit unit.

16. A display device, comprising:

first and second substrates each comprising a display area and a non-display area adjacent to the display area, wherein the second substrate has thicker and thinner portions that do not overlap each other, and wherein the thicker portion has a thickness greater than that of the thinner portion;

an internal circuit unit formed in the non-display area;

an insulating layer interposed between and not directly contacting the first and second substrates, wherein the insulating layer at least partially overlaps the internal circuit unit in the depth dimension of the display device; and

a sealing member formed between the non-display areas of the first and second substrates to surround the display areas,

wherein the sealing member comprises a first portion not overlapping the internal circuit unit in the depth dimension of the display device and a second portion at least partially overlapping the internal circuit unit in the depth dimension of the display device, wherein the first portion of the sealing member is in direct physical contact with the thicker portion of the second substrate, wherein a groove is formed in the second substrate at a position corresponding to the second portion of the sealing member, wherein the second portion of the sealing member completely fills the entirety of the groove, wherein the second portion of the sealing member surrounds and directly contacts at least three sides of the insulating layer,

wherein a first distance between the first and second substrates corresponding to the first portion of the sealing member is less than a second distance between the first and second substrates corresponding to the second portion of the sealing member,

wherein a thickness of the thicker portion of the second substrate is equal to a thickness of a portion of the second substrate which is disposed over the display area,

wherein the insulating layer includes a top surface, a bottom surface opposing the top surface and facing the first substrate, first and second side surfaces opposing each other, and wherein the three sides of the insulating layer include the top surface, and the first and second side surfaces.

17. The display device of claim 16, wherein an upper part of the second portion is inserted into the groove.

18. The display device of claim 16, further comprising a touch electrode pattern formed over the second substrate, wherein at least a portion of the groove is formed directly below the touch electrode pattern.