Flexible organic light emitting display device having a dam in a folding region

Patent metadata

Field	Value
Publication number	US-10930887-B2
Application number	US-201916256502-A
Country	US
Kind code	B2
Filing date	Jan 24, 2019
Priority date	Oct 28, 2015
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A flexible organic light emitting display (OLED) device includes a flexible substrate having a display area, a non-display area at a periphery of the display area and a folding region; at least one organic emitting diode on the flexible substrate in the display area; an encapsulation film covering the organic emitting diode; and a dam on the flexible substrate. The dam laterally surrounds the display area and includes: a first dam in the folding region; and a second dam outside the folding region, wherein the average thickness of the first dam is smaller than the average thickness of the second dam.

First claim

What is claimed is:

1. A flexible organic light emitting display (OLED) device, comprising:
a flexible substrate comprising:
a display area;
a non-display area at a periphery of the display area; and
a folding region;

at least one organic emitting diode on the flexible substrate in the display area;
an encapsulation film covering the organic emitting diode; and
a dam on the flexible substrate, the dam laterally surrounding the display area and comprising:
a first dam in the folding region; and
a second dam outside the folding region,

wherein an average thickness of the first dam is smaller than the average thickness of the second dam,
wherein the first dam and the second dam are on a same layer, and
wherein the encapsulation film contacts an entire top surface of the first dam and an entire top surface of the second dam.

2. The flexible OLED device according to 1 , wherein the encapsulation film comprises:
a first inorganic layer;
an organic layer on the first inorganic layer; and
a second inorganic layer on the organic layer,
wherein the dam laterally surrounds the organic layer, and
wherein the first inorganic layer and the second inorganic layer cover the dam.

3. The flexible OLED device according to 1 , wherein the first dam and the second dam have a constant thickness.

4. The flexible OLED device according to 1 , wherein the first dam comprises a first portion having a first thickness, and a second portion having a second thickness,
wherein the first thickness is smaller than the second thickness.

5. The flexible OLED device according to 4 , wherein the first dam comprises one or both of: a convex portion and a concave portion.

6. The flexible OLED device of claim 4 , wherein the second portion of the first dam has a same thickness as the second dam.

7. The flexible OLED device according to 4 , wherein the second portion of the first dam has a smaller thickness than the second dam.

8. The flexible OLED device according to 1 , wherein the first dam includes a single layer, and the second dam includes a lower layer and an upper layer.

9. The flexible OLED device according to 8 , wherein the lower layer of the second dam and the first dam are in one continuous layer.

10. The flexible OLED device according to 8 , further comprising:
a bank layer surrounding each of a plurality of pixel regions defined in the display area; and
at least one spacer on the bank layer,
wherein the first dam is in a same layer as the bank layer,
wherein the lower layer of the second dam is in the same layer as the bank layer, and
wherein the upper layer of the second dam is in a same layer as the spacer.

11. The flexible OLED device according to 1 , wherein the first dam continuously covers the flexible substrate.

12. The flexible OLED device according to 1 , wherein the first dam is partially removed and comprises dam patterns configured to block flow of an organic material out of the display area.

13. The flexible OLED device according to 12 , wherein the dam patterns comprise first dam patterns and second dam patterns spaced apart from each other and arranged in a zigzag shape.

14. The flexible OLED device according to 1 , wherein the encapsulation film corresponding to the first dam has a first average height from the flexible substrate, and
wherein the encapsulation film corresponding to the second dam has a second average height from the flexible substrate such that the second average height is greater than the first average height.

15. A method of fabricating a flexible organic light emitting display device, the method comprising:
providing a flexible substrate comprising:
providing a display area;
providing a non-display area at a periphery of the display area; and
providing a folding region;

forming a dam surrounding the display area on the flexible substrate, the forming the dam comprising:
providing a first dam in the folding region; and
providing a second dam outside the folding region, an average thickness of the first dam being smaller than an average thickness of the second dam;

forming an emitting diode within the display area;
covering the display area and the non-display area with a first inorganic layer; and
covering the display area with an organic layer,
wherein a lower surface of the first dam and a lower surface of the second dam have a same height from the flexible substrate, and
wherein the encapsulation film contacts an entire top surface of the first dam and an entire top surface of the second dam.

16. The method according to 15 , wherein the first dam comprises a first portion having a first thickness, and a second portion having a second thickness, and wherein the first thickness is smaller than the second thickness.

17. The method according to 16 , wherein the second portion of the first dam has a same thickness as the second dam.

18. The method according to 16 , wherein the second portion of the first dam has a smaller thickness than the second dam.

19. The method according to 15 , wherein the first dam includes a single layer, and the second dam includes a lower layer and an upper layer.

20. The method according to 15 , wherein the first dam is partially removed and comprises dam patterns configured to block flow of an organic material out of the display area.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Jae-Young
• Kim Ji-Min
• KIM Gi-Youn
• Oh Sang-Hoon
• Lee Wan-Soo

Classifications

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/8722 Primary

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H10K50/846

  comprising getter material or desiccants · CPC title

• H10K77/111 Primary

  Flexible substrates · CPC title

• Y02E10/549

  Organic PV cells · CPC title