Display apparatus and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2020066811-A1
Application number	US-201916406237-A
Country	US
Kind code	A1
Filing date	May 8, 2019
Priority date	Aug 23, 2018
Publication date	Feb 27, 2020
Grant date	—

Abstract

A display apparatus including a display substrate, a light-emitting device on the display substrate, an encapsulation substrate on the light-emitting device and bonded to the display substrate, and a diffraction-grating layer on a top surface of the encapsulation substrate, wherein the diffraction-grating layer includes a plurality of diffraction patterns spaced apart from one another by a predetermined distance, and each of the plurality of diffraction patterns has a stacked structure of a lower layer and an upper layer, wherein the lower and upper layers include different materials.

First claim

What is claimed is:

1 . A display apparatus comprising:
a display substrate; a light-emitting device on the display substrate; an encapsulation substrate on the light-emitting device and bonded to the display substrate; and a diffraction-grating layer on a top surface of the encapsulation substrate, wherein the diffraction-grating layer comprises a plurality of diffraction patterns spaced apart from one another by a predetermined distance, wherein each of the plurality of diffraction patterns has a multi-layer structure of a lower layer and an upper layer, and wherein the lower layer and the upper layer include different materials.

2 . The display apparatus of claim 1 , wherein the upper layer includes a same material as the encapsulation substrate.

3 . The display apparatus of claim 1 , wherein the plurality of diffraction patterns are arranged with a same period in a first direction and a second direction which intersect each other perpendicularly.

4 . The display apparatus of claim 1 , wherein the lower layer and the upper layer comprise different inorganic materials.

5 . The display apparatus of claim 4 , wherein the lower layer comprises at least one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO).

6 . The display apparatus of claim 4 , wherein the upper layer comprises at least one selected from the group consisting of silicon oxide, silicon nitride, and silicon oxynitride.

7 . The display apparatus of claim 1 , wherein the lower layer includes undercut regions recessed from side edges of the upper layer.

8 . The display apparatus of claim 1 , wherein a thickness of the lower layer is thinner than that of the upper layer.

9 . The display apparatus of claim 1 , wherein the display substrate comprises a thin-film transistor electrically connected to the light-emitting device.

10 . The display apparatus of claim 9 , wherein the light-emitting device comprises a pixel electrode electrically connected to the thin-film transistor, an opposite electrode on the pixel electrode, and an intermediate layer interposed between the pixel electrode and the opposite electrode and including an organic emission layer.

11 . A method of manufacturing a display apparatus, the method comprising:
forming a light-emitting device on a display substrate; placing an encapsulation substrate on the light-emitting device and bonding the display substrate to the encapsulation substrate; and forming a diffraction-grating layer on a top surface of the encapsulation substrate, wherein the forming of the diffraction-grating layer comprises:
sequentially forming a first layer and a second layer, which include different materials, on the whole of the top surface of the encapsulation substrate;
patterning the second layer by using a photosensitive layer as a mask to form an upper layer of the diffraction-grating layer; and
patterning the first layer by using the patterned second layer as a mask, to form a lower layer of the diffraction-grating layer.

12 . The method of claim 11 , wherein the upper layer and the lower layer constitute diffraction patterns of the diffraction-grating layer, and the diffraction patterns are spaced apart from one another by a predetermined distance.

13 . The method of claim 11 , wherein the first layer and the second layer comprise different inorganic materials.

14 . The method of claim 13 , wherein the second layer including a same material as the encapsulation substrate.

15 . The method of claim 13 , wherein the first layer comprises at least one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO).

16 . The method of claim 13 , wherein the second layer comprises at least one selected from the group consisting of silicon oxide, silicon nitride, and silicon oxynitride.

17 . The method of claim 11 , wherein the display substrate comprises a thin-film transistor electrically connected to the light-emitting device, and the light-emitting device comprises a pixel electrode electrically connected to the thin-film transistor, an opposite electrode on the pixel electrode, and an intermediate layer interposed between the pixel electrode and the opposite electrode and including an organic emission layer.

18 . The method of claim 17 , wherein a thickness of the lower layer is thinner than that of the upper layer.

19 . The method of claim 11 , wherein the second layer is patterned by dry etching and the first layer is patterned by wet etching.

20 . The method of claim 19 , wherein the first layer includes undercut regions recessed from side edges of the second layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Cha Gwangmin
• Kim Woongsik
• Byun Jinsu
• Sugitani Koichi
• Han Saehee

Classifications

• G02B27/0101

  characterised by optical features (G02B27/0172 takes precedence) · CPC title

• G02B27/4233

  having a diffractive element [DOE] contributing to a non-imaging application (diffusers having a diffractive element G02B5/0252; filters having a diffractive element G02B5/203; systems for controlling the direction of light having diffractive elements G02B26/0808; scanning systems having diffractive elements G02B26/106; beam shaping systems using diffractive optical elements G02B27/0944; beam splitting or combining systems operating by diffraction G02B27/1086) · CPC title

• H01L51/5262

  Electricity · mapped topic

• H01L27/3244 Primary

  Electricity · mapped topic

• H01L51/5237

  Electricity · mapped topic