Flexible display device with multiple types of micro-coating layers

• US 9,706,607 B2
• Filed: 12/10/2014
• Issued: 07/11/2017
• Est. Priority Date: 12/10/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Sungwoo, Choi, SieHyug, Park, Jehong, Lee, Yeasle, Kim, Chiwoong
• Primary Examiner(s): Patel, Ashok
• Application Number:
  US14/566,613
• Publication Number:
  US 20160174304A1
• Time in Patent Office: 944 Days
• Field of Search: 313498-512
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: H05B 33/06 Electrode terminals
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/871 Self-supporting sealing arrangements
• CPC Class Codes: H10K 59/873 Encapsulations
• CPC Class Codes: H10K 59/874 including getter material or desiccant
• CPC Class Codes: H10K 59/8793 Arrangements for polarized light emission H10K59/8791 takes precedence
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

There is provided a flexible display having a plurality of innovations configured to allow bending of a portion or portions to reduce apparent border size and/or utilize the side surface of an assembled flexible display.

Claims

1. A flexible display apparatus, comprising:

a base layer having a bend allowance section between a first portion and a second portion of the flexible display apparatus;

a display area including a plurality of organic light-emitting diode (OLED) elements provided in the first portion of the base layer;

an encapsulation over the OLED elements in the display area;

a printed circuit film attached in the second portion of the base layer;

a plurality of wire traces routed from the first portion to the second portion of the base layer;

a first micro-coating layer coated over the plurality of wire traces; and

a second micro-coating layer coated over the first micro-coating layer coated over the plurality of wire traces.

2. The flexible display apparatus of claim 1, wherein at least one of the first micro-coating layer and the second micro-coating layer is formed of a photo-curable material.

3. The flexible display apparatus of claim 2, further comprising a polarization layer on the encapsulation arranged to expose an upper surface of the encapsulation between an edge of polarization layer and an edge of the encapsulation, wherein at least one of the first micro-coating layer and the second micro-coating layer is in contact with the polarization layer.

4. The flexible display apparatus of claim 2, further comprising a polarization layer on the encapsulation configured to expose an upper surface of the encapsulation between an edge of the polarization layer and an edge of the encapsulation, wherein at least one of the first micro-coating layer and the second micro-coating layer is spaced apart from the polarization layer.

5. The flexible display apparatus of claim 1, wherein at least one of the first micro-coating layer and the second micro-coating layer includes one or more of getter materials.

6. The flexible display apparatus of claim 5, wherein said one or more getter materials includes silica based particles.

7. The flexible display apparatus of claim 1, wherein at least one of the first micro-coating layer and the second micro-coating layer is coated over at least some parts of the encapsulation.

8. The flexible display apparatus of claim 1, wherein at least one of the first micro-coating layer and the second micro-coating layer is coated over at least some part of the printed circuit film.

9. A flexible display apparatus, comprising:

a base layer provided with a display area and a non-display area, the display area including a plurality of organic light-emitting diode (OLED) elements and the non-display area including a bend allowance section;

an encapsulation provided on the plurality of OLED elements;

a printed circuit film attached to the base layer at the non-display area;

one or more wire traces routed in a bend allowance section between the encapsulation and the printed circuit film; and

at least two micro-coating layers coated in a plurality of regions between the encapsulation and the printed circuit film.

10. The flexible display apparatus of claim 9, wherein a first micro-coating layer among the at least two micro-coating layers is coated over a first region corresponding to at least a part of the bend allowance section, and wherein a second micro-coating layer among the at least two micro-coating layers is coated over a second region positioned adjacent to the first region.

11. The flexible display apparatus of claim 10, wherein the second region is between the first region and the encapsulation.

12. The flexible display apparatus of claim 11, wherein the second micro-coating layer is coated on at least some part of the encapsulation.

13. The flexible display apparatus of claim 11, wherein the second region is between the first region and the printed circuit film.

14. The flexible display apparatus of claim 13, wherein the second micro-coating layer is coated on at least some part of the printed circuit film.

15. The flexible display apparatus of claim 11, wherein the second region coated with the second micro-coating layer is provided at two opposite sides of the first region.

16. The flexible display apparatus of claim 15, wherein at least some upper surface of the encapsulation and/or at least some upper surface of the printed circuit film is coated with the second micro-coating layer.

17. The flexible display apparatus of claim 15, wherein the first micro-coating layer is overflowed onto the second micro-coating layer coated in the second region.

18. The flexible display apparatus of claim 15, wherein the first micro-coating layer coated in the first region is overflowed onto at least some part of the encapsulation, at least some part of the printed circuit film or both the at least some part of the encapsulation and the at least some part of the printed circuit film.

19. The flexible display apparatus of claim 10, wherein the first micro-coating layer is more flexible than the second micro-coating layer.

20. The flexible display apparatus of claim 19, wherein the second micro-coating layer has a higher adhesive property than the first type of micro-coating layer.