Display device including a light blocking layer over a pixel defining layer

Patent metadata

Field	Value
Publication number	US-10756154-B2
Application number	US-201815984618-A
Country	US
Kind code	B2
Filing date	May 21, 2018
Priority date	Jul 19, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A display device including a substrate that includes a circuit layer; an insulating layer on the substrate; a pixel defining layer on the insulating layer, the pixel defining layer having an opening exposing a region of a top surface of the insulating layer; a light blocking layer covering a top surface and a side surface of the pixel defining layer; and an organic electroluminescent element in the opening, wherein the organic electroluminescent element includes a first electrode on the region of the top surface of the insulating layer exposed through the opening; at least one organic layer on the first electrode; and a second electrode on the at least one organic layer.

First claim

What is claimed is:

1. A display device, comprising:
a substrate that includes a circuit layer;
an insulating layer on the substrate;
a pixel defining layer on the insulating layer, the pixel defining layer having an opening exposing a region of a top surface of the insulating layer;
a light blocking layer covering a top surface and a side surface of the pixel defining layer, the light blocking layer configured to absorb light of an ultraviolet wavelength band; and
an organic electroluminescent element in the opening, wherein the organic electroluminescent element includes a first electrode on the region of the top surface of the insulating layer exposed through the opening; at least one organic layer on the first electrode; and a second electrode on the at least one organic layer,
wherein the light blocking layer includes at least one of a benzotriazole-based light absorbent, a benzophenone-based light absorbent, a salicylic acid-based light absorbent, a salicylate-based light absorbent, a cyanoacrylate-based light absorbent, a cinnamate-based light absorbent, an oxanilide-based light absorbent, a polystyrene-based light absorbent, a polyferrocenylsilane-based light absorbent, a methine-based light absorbent, an azomethine-based light absorbent, a triazine-based light absorbent, a para-amino benzoic-acid-based light absorbent, a cinnamic acid-based light absorbent, or an urocanic acid-based light absorbent.

2. The display device as claimed in claim 1 , wherein the light blocking layer is directly on the top surface and the side surface of the pixel defining layer.

3. The display device as claimed in claim 1 , wherein the light blocking layer further includes an auxiliary light blocking portion on the region of the top surface of the insulating layer exposed through the opening.

4. The display device as claimed in claim 3 , wherein the auxiliary light blocking portion is under the first electrode such that the auxiliary light blocking portion is between the first electrode and the insulating layer.

5. The display device as claimed in claim 1 , wherein the light blocking layer absorbs light of a wavelength band ranging from 350 nm to 450 nm.

6. The display device as claimed in claim 1 , wherein the light blocking layer includes at least one light absorbent that absorbs light of a wavelength band ranging from 350 nm to 450 nm.

7. The display device as claimed in claim 1 , further comprising an encapsulating layer on the organic electroluminescent element,
wherein the encapsulating layer includes a first light absorbent that absorbs light of a wavelength band ranging from 350 nm to 400 nm.

8. The display device as claimed in claim 7 , further comprising an input sensor directly on the encapsulating layer.

9. The display device as claimed in claim 1 , further comprising a polarizing member on the organic electroluminescent element.

10. The display device as claimed in claim 9 , wherein the polarizing member includes a second light absorbent that absorbs light of a wavelength band ranging from 350 nm to 400 nm.

11. The display device as claimed in claim 1 , further comprising a color filter member on the organic electroluminescent element.

12. The display device as claimed in claim 11 , wherein the color filter member includes a third light absorbent that absorbs light of a wavelength band ranging from 350 nm to 400 nm.

13. The display device as claimed in claim 1 , wherein:
an electrode connection hole is defined in the insulating layer, and
the display device further includes a connection electrode filling the electrode connection hole and connecting the first electrode to the circuit layer.

14. A display device, comprising:
an insulating layer;
a pixel defining layer on the insulating layer, the pixel defining layer having an opening exposing a region of a top surface of the insulating layer;
a light blocking layer on a top surface of the pixel defining layer, a side surface of the pixel defining layer that is exposed by the opening, and the region of the top surface of the insulating layer that is exposed by the opening, the light blocking layer configured to absorb light of an ultraviolet wavelength band; and
an organic electroluminescent element in the opening, wherein the organic electroluminescent element includes a first electrode on the light blocking layer; at least one organic layer on the first electrode; and a second electrode on the at least one organic layer,
wherein the light blocking layer includes at least one of a benzotriazole-based light absorbent, a benzophenone-based light absorbent, a salicylic acid-based light absorbent, a salicylate-based light absorbent, a cyanoacrylate-based light absorbent, a cinnamate-based light absorbent, an oxanilide-based light absorbent, a polystyrene-based light absorbent, a polyferrocenylsilane-based light absorbent, a methine-based light absorbent, an azomethine-based light absorbent, a triazine-based light absorbent, a para-amino benzoic-acid-based light absorbent, a cinnamic acid-based light absorbent, or an urocanic acid-based light absorbent.

15. The display device as claimed in claim 14 , wherein the light blocking layer includes at least one light absorbent that absorbs light of a wavelength band ranging from 350 nm to 450 nm.

16. The display device as claimed in claim 14 , further comprising an optical member on the organic electroluminescent element;
wherein the optical member is a polarizing member or a color filter member.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Byung-Chul
• Kim Sujeong
• Yeon Kiyoung
• Joo Sun-Kyu
• Huh Chul
• Kim Inok
• Mun Hyeran
• Song Inseok
• Lee Wooyoung
• Lee Yui-Ku

Classifications

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/8792 Primary

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/126

  Shielding, e.g. light-blocking means over the TFTs · CPC title

• H10K59/124 Primary

  Insulating layers formed between TFT elements and OLED elements · CPC title

• H10D86/451

  characterised by the compositions or shapes of the interlayer dielectrics · CPC title