Organic light emitting display and method of manufacturing the same

• US 10,454,068 B2
• Filed: 12/26/2013
• Issued: 10/22/2019
• 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
• Primary Examiner(s): Sengdara, Vongsavanh
• Application Number:
  US14/653,151
• Publication Number:
  US 20150340655A1
• Time in Patent Office: 2,126 Days
• 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 59/8723 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/874 including getter material or desiccant
• 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 overcoating layer formed on the thin film transistor;

an organic light emitting element formed on the thin film transistor and the overcoating layer, and including a first electrode, an organic emission layer and a second electrode;

an encapsulation unit covering an entirety of the organic light emitting element;

a spacer formed on the encapsulation unit and being in directly contact with an upper surface of the encapsulation unit, with a separation space less than or equal to about 20 μ

m between the upper surface of encapsulation unit and an upper substrate disposed to face the lower substrate;

a desiccant fully filling the separation space in each subpixel region between the lower substrate and the upper substrate; and

an adhesive member formed on edges of the overcoating layer, and attaching the lower substrate and the upper substrate to each other,

wherein the encapsulation unit directly contacts the overcoating layer at edges of the overcoating layer, and only disposed in an inner space surrounded by the overcoating layer, the upper substrate and the adhesive member,

wherein the encapsulation unit and the adhesive member are separated from each other by the desiccant in the inner space corresponding to edges of the overcoating layer,

wherein each subpixel region includes an emissive area in which an actual image is displayed and a transmissive area transmitting external light,

wherein the thin film transistor, the organic light emitting element and a color filter formed on the upper substrate are only disposed in the emissive area.

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

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

4. The organic light emitting display according to claim 1, wherein a light emitted from the organic light emitting element is discharged to the upper substrate.

5. The organic light emitting display according to claim 1, wherein the color filter comes into contact with the spacer, and is formed to be separated from the encapsulation unit.

6. 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.

7. The organic light emitting display according to claim 6, wherein a cell gap between the lower substrate and the upper substrate is less than or equal to 20 μ

m, and thereby a viewing angle increases.

8. An organic light emitting display, comprising:

a lower substrate on which an organic light emitting element on an overcoating layer and including an anode, an organic emission layer and a cathode,

an encapsulation unit for covering an entirety of the organic light emitting element, the encapsulation unit having a structure in which an organic thin film and an inorganic thin film are stacked;

an upper substrate on which a color filter is formed;

a spacer disposed between the lower substrate and the upper substrate and being in directly contact with an upper surface of the encapsulation unit, with a separation space between the upper surface of encapsulation unit and the upper substrate;

a medium layer positioned between the lower substrate and the upper substrate, having substantially the same refractive index as a refractive index of the upper substrate and fully filling the separation space; and

an adhesive member formed on edges of the overcoating layer, and attaching the lower substrate and the upper substrate to each other,

wherein the encapsulation unit directly contacts the overcoating layer at edges of the overcoating layer, and only disposed in an inner space surrounded by the overcoating layer, the upper substrate and the adhesive member,

wherein the encapsulation unit and the adhesive member are separated from each other by the medium layer in the inner space corresponding to edges of the overcoating layer,

wherein the lower substrate includes a plurality of subpixel regions, each subpixel region includes an emissive area in which an actual image is displayed and a transmissive area transmitting external light,

wherein the organic light emitting element and the color filter are only disposed in the emissive area.

9. The organic light emitting display according to claim 8, wherein the medium layer inhibits penetration of water.

10. The organic light emitting display according to claim 8, wherein the medium layer fills a space formed between the lower substrate and the upper substrate.

11. The organic light emitting display according to claim 8, wherein the medium layer corresponds to a desiccant of a type of alcohol.

12. The organic light emitting display according to claim 11, wherein the desiccant of the type of alcohol corresponds to glycerin.

13. The organic light emitting display according to claim 8, wherein the lower substrate and the upper substrate are a glass substrate or a flexible substrate.

14. The organic light emitting display according to claim 8, further comprising:

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

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

15. The organic light emitting display according to claim 14, wherein a refractive index of the color filter is substantially the same as a refractive index of the upper substrate.

16. The organic light emitting display according to claim 8, wherein a cell gap between the lower substrate and the upper substrate is less than or equal to 20 μ

m, and thereby a viewing angle increases.

17. An organic light emitting display, comprising:

a lower substrate on which a thin film transistor, and an organic light emitting element on an overcoating layer and including an anode, an organic emission layer and a cathode are formed;

an encapsulation unit covering an entirety of the organic light emitting element formed on the lower substrate, the encapsulation unit having a structure in which an organic thin film and an inorganic thin film are stacked;

an upper substrate disposed to face the lower substrate;

a spacer disposed between the upper substrate and the lower substrate, being in directly contact with an upper surface of the encapsulation unit and maintaining a cell gap, with a separation space less than or equal to about 20 μ

m between the upper surface of encapsulation unit,

a desiccant filling the separation space between the lower substrate and the upper substrate to inhibit penetration of water, the desiccant corresponding to a type of gelled state or a liquid state alcohol including carbon (C), hydrogen (H) and a hydroxyl group (OH), and

an adhesive member formed on edges of the overcoating layer, and attaching the lower substrate and the upper substrate to each other,

wherein the encapsulation unit being contacts the overcoating layer at edges of the overcoating layer, and only disposed in an inner space surrounded by the overcoating layer, the upper substrate and the adhesive member

wherein the encapsulation unit and the adhesive member are separated from each other by desiccant in the inner space corresponding to at edges of the overcoating layer,

wherein the lower substrate includes a plurality of subpixel regions, each subpixel region includes an emissive area in which an actual image is displayed and a transmissive area transmitting external light,

wherein the thin film transistor, the organic light emitting element and a color filter formed on the upper substrate are only disposed in the emissive area.

18. The organic light emitting display according to claim 17, wherein the spacer is formed on a surface of the upper substrate.

19. The organic light emitting display according to claim 17, further comprising:

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