Rollable display device

• US 9,991,468 B2
• Filed: 12/09/2015
• Issued: 06/05/2018
• Est. Priority Date: 02/02/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Junghun, Kim, Younjoon, Lee, Sangjo, Lee, Jusuck, Jang, Mi, Choi, Kyungmin
• Primary Examiner(s): Shamsuzzaman, Mohammed
• Application Number:
  US14/964,361
• Publication Number:
  US 20160226021A1
• Time in Patent Office: 909 Days
• Field of Search: 257 40, 1 1, 40515, 349 58, 428415
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/87 Passivation; Containers; Encapsulations
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

A display device includes: a frame; and a flexible display unit configured to be wound into the frame, and including a transparent adhesive layer, the adhesive layer having a first surface and a second surface opposite to the first surface. The adhesive layer is configured to adhere layers on the first surface and the second surface thereof to each other, and a first elongation percentage of the adhesive layer in a first direction is greater than a second elongation percentage of the adhesive layer in a second direction crossing the first direction, the first direction being a direction along which the display unit is unwound from the frame.

Claims

1. A display device comprising:

a frame; and

a flexible display unit configured to be wound into the frame, and comprising a transparent adhesive layer, the adhesive layer having a first surface extending in first and second directions and a second surface opposite to the first surface,

wherein the adhesive layer is configured to adhere layers on the first surface and the second surface thereof to each other,

wherein the adhesive layer comprises a base and a plurality of modulus adjusting areas at the first surface of the adhesive layer,

wherein a first elongation percentage of the adhesive layer in the first direction is greater than a second elongation percentage of the adhesive layer in the second direction crossing the first direction, the first direction being a direction along which the display unit is unwound from the frame,

wherein the adhesive layer has a depth direction extending perpendicular to the first and second directions from the first surface to the second surface,

wherein the plurality of modulus adjusting areas at the first surface of the adhesive layer each extend in the second direction and are separated from each other along only the first direction,

wherein the base and the plurality of modulus adjusting areas are alternately arranged along the first direction at the first surface of the adhesive layer, and

wherein the plurality of modulus adjusting areas extend in the depth direction of the adhesive layer from the first surface of the adhesive layer.

2. The display device of claim 1, wherein the first direction and the second direction are perpendicular to each other.

3. The display device of claim 1, wherein a depth of each of the plurality of modulus adjusting areas is in a range of 10% to 90% of a thickness of the adhesive layer.

4. The display device of claim 1, wherein a depth of each of the plurality of modulus adjusting areas is in a range of 10% to 50% of a thickness of the adhesive layer.

5. The display device of claim 1, wherein the first elongation percentage increases from one edge to an opposite edge of the adhesive layer, and

wherein the one edge is closer to the frame than the opposite edge.

6. The display device of claim 5, wherein intervals between adjacent ones of the plurality of modulus adjusting areas decrease from the one edge to the opposite edge.

7. The display device of claim 5, wherein a depth of each of the plurality of modulus adjusting areas increases from the one edge to the opposite edge.

8. The display device of claim 5, wherein the plurality of modulus adjusting areas are spaced from the one edge and the opposite edge.

9. The display device of claim 1, wherein the plurality of modulus adjusting areas comprise a plurality of first modulus adjusting areas extending in the depth direction of the adhesive layer from the first surface of the adhesive layer and a plurality of second modulus adjusting areas extending in the depth direction of the adhesive layer from the second surface of the adhesive layer.

10. The display device of claim 9, wherein the plurality of first modulus adjusting areas and the plurality of second modulus adjusting areas are alternately arranged.

11. The display device of claim 1, wherein the flexible display unit comprises a flexible substrate, a display layer on the flexible substrate, a thin-film encapsulation layer sealing the display layer, and a functional layer on the thin-film encapsulation layer, and

wherein the adhesive layer adheres the thin-film encapsulation layer and the functional layer to each other.