TRANSPARENT ORGANIC LIGHT EMITTING DISPLAY APPARATUS AND METHOD OF MANUFACTURING THE SAME

• US 20200136068A1
• Filed: 09/17/2019
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: LEE, Joonsuk, KIM, SeJune, KIM, Dohyung, LEE, Saemleenuri
• Granted Patent: US 11,322,698 B2
• Time in Patent Office: Days
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/844 Encapsulations
• 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 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• 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 71/233 by photolithographic etching
• 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 transparent organic light emitting display apparatus and a method of manufacturing the same are discussed. The transparent organic light emitting display apparatus can comprise an emission area, a transmission area disposed adjacent to the emission area and configured to pass external light therethrough, and an undercut area formed in the transmission area, wherein the undercut area is filled by an encapsulation layer.

Claims

1. A transparent organic light emitting display apparatus comprising:

a pixel area including an emission area and a transmission area disposed adjacent to the emission area, the emission area configured to display an image and the transmission area configured to pass external light,

wherein the transmission area includes;

a planarization layer covering a thin film transistor of the emission area, and including an overhanging portion,

an encapsulation layer disposed on the planarization layer, and

an undercut area disposed below the overhanging portion of the planarization layer, and filled by the encapsulation layer.

2. The transparent organic light emitting display apparatus according to claim 1, wherein the undercut area is formed to have at least one line pattern in the transmission area.

3. The transparent organic light emitting display apparatus according to claim 2, wherein the at least one line pattern of the undercut area corresponds to one pixel.

4. The transparent organic light emitting display apparatus according to claim 2, herein the at least one line pattern of the undercut area corresponds to multiple pixels.

5. The transparent organic light emitting display apparatus according to claim 1, wherein the undercut area has a closed-loop structure in the transmission area.

6. The transparent organic light emitting display apparatus according to claim 5, wherein the closed-loop structure of the undercut area corresponds to one pixel.

7. The transparent organic light emitting display apparatus according to claim 5, wherein the closed-loop structure of the undercut area corresponds to multiple pixels.

8. The transparent organic light emitting display apparatus according to claim 1, wherein the transmission area further includes an interlayer dielectric layer disposed below the planarization layer,

the interlayer dielectric layer including an indented area corresponding to a portion of the undercut area.

9. The transmission organic light emitting display apparatus according to claim 8, wherein a taper angle of the indented area of the interlayer dielectric layer in the undercut area is greater than 90 degrees.

10. The transparent organic light emitting display apparatus according to claim 8, wherein the transmission area includes:

a first protection layer disposed between the planarization layer and the interlayer dielectric layer, and including a thru hole corresponding to the undercut area,

wherein the encapsulation layer fills the thru hole of the first protection layer in the undercut area.

11. The transmission organic light emitting display apparatus according to claim 10, wherein a taper angle of the indented area of the interlayer dielectric layer in the undercut area is greater than 90 degrees, and a taper angle of the first protection layer in the undercut area is greater than 90 degrees.

12. The transparent organic light emitting display apparatus according to claim 11, wherein the taper angle of the first protection layer in the undercut area is larger than the taper angle of the interlayer dielectric in the undercut area.

13. The transparent organic light emitting display apparatus according to claim 10, wherein a width of the thru hole of the first protection layer in the undercut area is larger than a width of the indented area the interlayer dielectric in the undercut area.

14. The transparent organic light emitting display apparatus according to claim 1, wherein the transmission area further includes an emission layer, a cathode electrode, and a second protection layer all covering the overhanging portion of the planarization layer.

15. The transparent organic light emitting display apparatus according to claim 14, wherein the emission layer, the cathode electrode and the second protection layer are disposed on a bottom surface of the undercut area.

16. The transparent organic light emitting display apparatus according to claim 14, wherein the cathode electrode and the second protection layer are disposed on a side surface of the undercut area below the overhanging portion of the planarization layer.

17. The transparent organic light emitting display apparatus according to claim 1, wherein the transmission area includes a plurality of the undercut areas, and is bendable.

18. A method of manufacturing a transparent organic light emitting display apparatus having an emission area, and a transmission area disposed adjacent to the emission area and configured to pass external light therethrough, the method comprising:

sequentially forming an interlayer dielectric and a first protection layer on a first substrate;

patterning a planarization layer over the first protection layer;

forming an organic light emitting device over the planarization layer; and

forming an encapsulation layer and an encapsulation substrate over the organic light emitting device,

wherein at least some portions of the transmission area are exposed and etched by using photolithography after the patterning of the planarization layer.

19. The method according to claim 18, wherein, in the exposing the at least some portions of the transmission area by using the photolithography, the exposed portions are partially overlapped with the planarization layer.

20. The method according to claim 18, wherein the etching the at least some portions of the transmission area is carried out by a wet etching process.