Display apparatus and light absorber included in display apparatus

Patent metadata

Field	Value
Publication number	US-12289992-B2
Application number	US-201917250808-A
Country	US
Kind code	B2
Filing date	Sep 27, 2019
Priority date	Oct 5, 2018
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

A display apparatus according to an embodiment includes light-emitting devices and an encapsulation member, wherein the encapsulation member includes a light absorber including a hexagonal heterocycle containing two or more nitrogen atoms as ring-forming atoms, and first to third substituents substituted at the hexagonal heterocycle, the first to third substituents being different from one another, and thus can effectively block external light, thereby exhibiting improved reliability.

First claim

The invention claimed is:

1. A display apparatus comprising:
a light-emitting device comprising a first electrode, a second electrode facing the first electrode, and a plurality of organic layers between the first electrode and the second electrode; and
an encapsulation member on the light-emitting device and comprising a light absorber,
wherein the light absorber comprises a hexagonal heterocycle comprising two or more nitrogen atoms as ring-forming atoms, and first to third substituents substituted at the hexagonal heterocycle, the first to third substituents being different from one another,
the first substituent is a substituted phenyl group comprising at least one hydroxyl group, and
the second substituent is a substituted or unsubstituted anthracene group, a substituted or unsubstituted phenanthrene, a substituted or unsubstituted pyrene group, a substituted or unsubstituted chrysene group, a substituted or unsubstituted dibenzofuran derivative, a substituted or unsubstituted carbazole derivative, or a substituted or unsubstituted fluorene derivative,
wherein a substituent of the substituted or unsubstituted dibenzofuran derivative, a substituent of the substituted or unsubstituted carbazole derivative, and a substituent of the substituted or unsubstituted fluorene derivative are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, and/or adjacent groups are bonded to each other to form a ring, and
wherein when the hexagonal heterocycle comprises three nitrogen atoms as ring-forming atoms, then the third substituent is a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 20 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring-forming carbon atoms.

2. The display apparatus of claim 1 , wherein the encapsulation member comprises at least one organic film and at least one inorganic film, and the at least one organic film comprises the light absorber.

3. The display apparatus of claim 2 , wherein the at least one organic film and the at least one inorganic film are alternately laminated, and
the at least one organic film comprises:
a first organic film to absorb light in a first wavelength region; and
a second organic film to absorb light in a second wavelength region different from the light in the first wavelength region.

4. The display apparatus of claim 1 , wherein the encapsulation member covers the light-emitting device.

5. The display apparatus of claim 1 , further comprising a polarizing member on the encapsulation member.

6. The display apparatus of claim 1 , wherein the encapsulation member comprises:
a first inorganic film adjacent to the second electrode;
a second inorganic film on the first inorganic film; and
an organic film between the first inorganic film and the second inorganic film, the organic film comprising the light absorber,
wherein the organic film has a transmittance of 10% or less at about 405 nm wavelength, a transmittance of 70% or more at about 430 nm wavelength, and a transmittance of 97% or more at about 450 nm wavelength.

7. The display apparatus of claim 1 , wherein the plurality of organic layers comprises:
a hole transport region on the first electrode;
an emission layer on the hole transport region; and
an electron transport region on the emission layer.

8. The display apparatus of claim 1 , further comprising a light blocking layer on the encapsulation member.

9. The display apparatus of claim 1 , wherein the hexagonal heterocycle is triazine or pyrimidine.

10. The display apparatus of claim 1 , wherein the first substituent is represented by at least one among Formulae H1 to H5:

and
wherein R, in Formulae H4 and H5, is a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms.

11. The display apparatus of claim 1 , wherein the light absorber is represented by Formula 1 or Formula 2:

and
wherein, in Formula 1 and Formula 2,
Ar is a substituted or unsubstituted anthracene group, a substituted or unsubstituted phenanthrene, a substituted or unsubstituted pyrene group, a substituted or unsubstituted chrysene group, a substituted or unsubstituted dibenzofuran derivative, a substituted or unsubstituted carbazole derivative, or a substituted or unsubstituted fluorene derivative,
a substituent of the substituted or unsubstituted dibenzofuran derivative, a substituent of the substituted or unsubstituted carbazole derivative, and a substituent of the substituted or unsubstituted fluorene derivative are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, and/or adjacent groups are bonded to each other to form a ring, and
R 2 to R 5 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted alkylamine group having 1 to 30 carbon atoms, a substituted or unsubstituted arylamine group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 ring-forming carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms,
in Formula 1, two among Y 1 to Y 3 are N and the remaining one among Y 1 to Y 3 is CH, and
R 1 is a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 20 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring-forming carbon atoms, and
in Formula 2, X is O or S, and
R 6 is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 ring-forming carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms.

12. The display apparatus of claim 11 , wherein Formula 1 is represented by at least one among Formula 1-1 to Formula 1-4:

wherein, in Formula 1-1 to Formula 1-4, Ar, Y 1 to Y 3 , R 1 , and R 4 are the same as defined in Formula 1.

13. The display apparatus of claim 11 , wherein Formula 2 is represented by at least one among Formula 2-1 to Formula 2-4:

and
wherein, in Formula 2-1 to Formula 2-4, X, Ar, R 4 , and R 6 are the same as defined in Formula 2.

14. The display apparatus of claim 11 , wherein Ar is represented by at least one among Ar-

Assignees

• Samsung Display Co Ltd

Inventors

• Han Sanghyun
• Kim Jongwoo
• Jeong Eunjae
• Kim Dongjun
• Yun Wonmin
• Kim Young Kook
• Park Eung Seok
• Ju Yongchan
• Kim Yisu
• Lee Byoungduk
• Hwang Seokhwan

Classifications

• H10K50/865

  comprising light absorbing layers, e.g. light-blocking layers · CPC title

• H10K50/8445

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/8792

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

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title