ORGANIC LIGHT EMITTING DISPLAY AND METHOD OF MANUFACTURING THE SAME

• US 20150340655A1
• Filed: 12/26/2013
• Published: 11/26/2015
• Est. Priority Date: 12/27/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: LEE, Joon Suk, KIM, Se June
• Granted Patent: US 10,454,068 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 2102/3026 Top emission
• 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 50/8428 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 77/10 Substrates, e.g. 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 are provided an organic light emitting display and a method of manufacturing the organic light emitting display. The organic light emitting display includes a lower substrate including a plurality of subpixel regions, a thin film transistor formed on the lower substrate, an organic light emitting element formed on the thin film transistor, an encapsulation unit for covering the organic light emitting element, a spacer formed on the encapsulation unit, an upper substrate disposed to face the lower substrate, and a desiccant between the lower substrate and the upper substrate. Various embodiments of the invention provide an organic light emitting display that enhances a viewing angle by minimizing a cell gap and minimizing a distortion of light, minimizes penetration of water or oxygen from the outside, and realizes a high resolution display by enhancing an aperture ratio, and a method of manufacturing the organic light emitting display.

Claims

1. An organic light emitting display, comprising:

a lower substrate including a plurality of subpixel regions;

a thin film transistor formed on the lower substrate;

an organic light emitting element formed on the thin film transistor;

an encapsulation unit for covering the organic light emitting element;

a spacer formed on the encapsulation unit;

an upper substrate disposed to face the lower substrate; and

a desiccant between the lower substrate and the upper substrate.

2. The organic light emitting display according to claim 1, wherein the encapsulation unit corresponds to an inorganic thin film or a structure in which an organic thin film and an inorganic thin film are stacked.

3. The organic light emitting display according to claim 1, further comprising:

an adhesive member attaching the lower substrate and the upper substrate to each other.

4. The organic light emitting display according to claim 3,

wherein the encapsulation unit and the adhesive member are separated from each other, and

the desiccant fills a separation space between the encapsulation unit and the adhesive member.

5. The organic light emitting display according to claim 1, wherein the desiccant fills a separation space between the lower substrate and the upper substrate.

6. The organic light emitting display according to claim 1, further comprising:

a color filter formed in a portion of the upper substrate.

7. The organic light emitting display according to claim 6, wherein the color filter comes into contact with the spacer, and is formed to be separated from the encapsulation unit.

8. The organic light emitting display according to claim 1, wherein the lower substrate and the upper substrate are bonded together in a vacuum bonding scheme.

9. An organic light emitting display, comprising:

a lower substrate on which an organic light emitting element and an encapsulation unit for covering the organic light emitting element are formed;

an upper substrate on which a color filter is formed;

a spacer disposed between the lower substrate and the upper substrate; and

a medium layer positioned between the lower substrate and the upper substrate, and having substantially the same refractive index as a refractive index of the upper substrate.

10. The organic light emitting display according to claim 9, wherein the medium layer inhibits penetration of water.

11. The organic light emitting display according to claim 9, wherein the medium layer fills a space formed between the lower substrate and the upper substrate.

12. The organic light emitting display according to claim 9, wherein the medium layer corresponds to a desiccant of a type of alcohol.

13. The organic light emitting display according to claim 12, wherein the desiccant of the type of alcohol corresponds to glycerin.

14. The organic light emitting display according to claim 9, further comprising:

an adhesive member attaching the lower substrate and the upper substrate to each other.

15. The organic light emitting display according to claim 9, wherein the lower substrate and the upper substrate are a glass substrate or a flexible substrate.

16. The organic light emitting display according to claim 9, further comprising:

a black matrix formed at a position corresponding to the spacer on the upper substrate; and

a color filter formed at a position corresponding to the organic light emitting element on the upper substrate.

17. The organic light emitting display according to claim 16, wherein a refractive index of the color filter is substantially the same as a refractive index of the upper substrate.

18. An organic light emitting display, comprising:

a lower substrate on which a thin film transistor and an organic light emitting element are formed;

an encapsulation unit for covering the organic light emitting element formed on the lower substrate;

an upper substrate disposed to face the lower substrate; and

a spacer disposed between the upper substrate and the lower substrate, and maintaining a cell gap to enhance a viewing angle.

19. The organic light emitting display according to claim 18, further comprising:

a desiccant formed between the lower substrate and the upper substrate to inhibit penetration of water.

20. The organic light emitting display according to claim 19, wherein the desiccant corresponds to a desiccant of a type of alcohol.

21. The organic light emitting display according to claim 19, wherein the desiccant is in a gelled state or a liquid state.

22. The organic light emitting display according to claim 18, wherein the spacer is formed on a surface of the upper substrate, and comes into contact with the encapsulation unit.

23. The organic light emitting display according to claim 18, further comprising:

a black matrix formed at a position corresponding to the spacer on the upper substrate.

24. A method of manufacturing an organic light emitting display, the method comprising:

forming an organic light emitting element and an encapsulation unit for covering the organic light emitting element on a lower substrate;

forming a color filter on an upper substrate;

forming a spacer on the color filter;

injecting a desiccant between the lower substrate and the upper substrate; and

bonding the lower substrate and the upper substrate together.