FLEXIBLE DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF

• US 20180182984A1
• Filed: 10/24/2017
• Published: 06/28/2018
• Est. Priority Date: 12/23/2016
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: LIM, Heung Kyoon, NAM, Kie Hyun
• Granted Patent: US 10,573,831 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 5/20 Filters polarising elements G02B5/30
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• 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

A flexible display device includes: a first flexible substrate and a second flexible substrate facing each other; a display part positioned on a surface of the first flexible substrate facing the second flexible substrate and including a plurality of thin film transistors and a plurality of light emitting elements; a color filter positioned on a surface of the second flexible substrate facing the first flexible substrate; an overcoat layer positioned between the display part and the color filter and covering the color filter; a gas barrier layer positioned between the display part and the overcoat layer and covering the overcoat layer; and an encapsulation part including a filler positioned between the display part and the gas barrier layer, and a sealant positioned at an outside of the filler, and an area of the gas barrier layer is larger than an area of the encapsulation part.

Claims

1. A flexible display device comprising:

a first flexible substrate and a second flexible substrate facing each other;

a display part positioned on a surface of the first flexible substrate facing the second flexible substrate and including a plurality of thin film transistors and a plurality of light emitting elements;

a color filter positioned on a surface of the second flexible substrate facing the first flexible substrate;

an overcoat layer positioned between the display part and the color filter and covering the color filter;

a gas barrier layer positioned between the display part and the overcoat layer and covering the overcoat layer; and

an encapsulation part including a filler positioned between the display part and the gas barrier layer, and a sealant positioned at an outside of the filler,

wherein an area of the gas barrier layer is larger than an area of the encapsulation part.

2. The flexible display device of claim 1, wherein an outer side of the sealant is spaced apart from an outer edge of the gas barrier layer in a direction toward a center of the display part.

3. The flexible display device of claim 2, wherein the encapsulation part further includes a getter layer positioned between the filler and the sealant.

4. The flexible display device of claim 1, wherein an area of the gas barrier layer is larger than an area of the overcoat layer.

5. The flexible display device of claim 1, wherein the gas barrier layer is formed as a single layer made of one of a silicon nitride, a silicon oxide, and a silicon oxynitride, or a stacked layer thereof.

6. The flexible display device of claim 1, wherein the first flexible substrate comprises glass, and the second flexible substrate comprises a plastic film.

7. The flexible display device of claim 1, wherein each of the first flexible substrate and the second flexible substrate comprises a plastic film.

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

arranging a buffer layer and a display part on a first flexible substrate;

arranging an encapsulation part including a filler covering the display part and a sealant positioned at an outside of the filler on the display part;

arranging a second flexible substrate on a carrier substrate;

arranging a color filter including a plurality of filter layers and a dark colored layer on the second flexible substrate;

arranging an overcoat layer and a gas barrier layer on the color filter;

stacking the first flexible substrate and the second flexible substrate such that the encapsulation part and the gas barrier layer contact each other, and then curing the sealant; and

separating the carrier substrate from the second flexible substrate.

9. The manufacturing method of the flexible display device of claim 8, wherein

the first flexible substrate includes glass, and

the second flexible substrate is a plastic film.

10. The manufacturing method of the flexible display device of claim 8, wherein

a process temperature of the color filter and a process temperature of the gas barrier layer are higher than a process temperature of the display part.

11. The manufacturing method of the flexible display device of claim 8, wherein

an area of the gas barrier layer is larger than an area of the overcoat layer and an area of the encapsulation part, and

an outer side of the sealant is spaced apart from an outer edge of the gas barrier layer in a direction toward a center of the display part.

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

arranging a first flexible substrate on a carrier substrate;

arranging a buffer layer and a display part on the first flexible substrate;

arranging an encapsulation part including a filler covering the display part and a sealant positioned at an outside of the filler on the display part;

arranging a second flexible substrate on another carrier substrate;

arranging a color filter including a plurality of filter layers and a dark colored layer on the second flexible substrate;

arranging an overcoat layer and a gas barrier layer on the color filter;

stacking the first flexible substrate and the second flexible substrate such that the encapsulation part and the gas barrier layer contact each other, and then curing the sealant; and

separating the carrier substrate from the first flexible substrate, and separating the another carrier substrate from the second flexible substrate.

13. The manufacturing method of the flexible display device of claim 12, wherein the first flexible substrate and the second flexible substrate are plastic films.

14. The manufacturing method of the flexible display device of claim 12, wherein a process temperature of the color filter and a process temperature of the gas barrier layer are higher than a process temperature of the display part.

15. The manufacturing method of the flexible display device of claim 12, wherein

an area of the gas barrier layer is larger than an area of the overcoat layer and an area of the encapsulation part, and

an outer side of the sealant is spaced apart from an outer edge of the gas barrier layer in a direction toward a center of the display part.