Rollable display device

• US 10,211,426 B2
• Filed: 06/04/2018
• Issued: 02/19/2019
• 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:
  US15/997,638
• Publication Number:
  US 20180287096A1
• Time in Patent Office: 260 Days
• Field of Search: 257 40, 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 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/87 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 59/8722 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• 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 flexible display unit configured to be wound in a roll shape, the flexible display unit comprising:

a flexible substrate;

a display layer on the flexible substrate;

a thin-film encapsulation layer sealing the display layer;

a functional layer on the thin-film encapsulation layer; and

an adhesive layer between the thin-film encapsulation layer and the functional layer, the adhesive layer comprising a base and a plurality of modulus adjusting areas having a line shape in a region of the base,

wherein the plurality of modulus adjusting areas are separated from each other along a first direction to form a stripe pattern,

wherein the base and the plurality of modulus adjusting areas comprise a same material, and

wherein a first modulus of the base is greater than a second modulus of the plurality of modulus adjusting areas;

wherein the base and the plurality of modulus adjusting areas are alternately arranged on a surface of the adhesive layer in the first direction, and

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

2. The display device of claim 1, 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 a second direction crossing the first direction.

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

4. The display device of claim 2, wherein each of the plurality of modulus adjusting areas extends in the second direction.

5. The display device of claim 2, further comprising a frame configured to accommodate the flexible display unit wound in the roll shape,

wherein the first direction is a direction along which the flexible display unit is unwound from the frame.

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

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

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

8. The display device of claim 6, wherein depths of the plurality of modulus adjusting areas increase from the one edge to the opposite edge.

9. 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.

10. 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.

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

12. The display device of claim 11, wherein the plurality of first modulus adjusting areas and the plurality of second modulus adjusting areas are alternately arranged.

13. The display device of claim 1, wherein the display layer comprises an organic light-emitting diode and a thin-film transistor electrically connected to the organic light-emitting diode.