Organic light emitting display device having a thin film encapsulation part having an organic film and an inorganic film

Patent metadata

Field	Value
Publication number	US-10361259-B2
Application number	US-201715628702-A
Country	US
Kind code	B2
Filing date	Jun 21, 2017
Priority date	Aug 12, 2016
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

Provided is an organic light emitting display device including a base substrate, a pixel layer, a quantum dot layer, and a thin film encapsulation part. The pixel layer includes a plurality of organic light emitting diodes on the base substrate. The quantum dot layer includes quantum dots on the pixel layer. The thin film encapsulation part is between the quantum dot layer and the pixel layer, and seals the pixel layer. The thin film encapsulation part includes a first inorganic film and an organic film. The first inorganic film has a plurality of first auxiliary films, each having a first refractive index, and a plurality of second auxiliary films, each having a second refractive index that differs from the first refractive index, alternately stacked with the plurality of first auxiliary films along a thickness direction of the base substrate.

First claim

What is claimed is:

1. An organic light emitting display device comprising:
a base substrate;
a pixel layer including a plurality of organic light emitting diodes and disposed on the base substrate;
a quantum dot layer including quantum dots on the pixel layer; and
a thin film encapsulation part between the quantum dot layer and the pixel layer, and sealing the pixel layer, wherein the thin film encapsulation part includes a first inorganic film and an organic film, the first inorganic film having
a plurality of first auxiliary films, each having a first refractive index, and
a plurality of second auxiliary films, each having a second refractive index different from the first refractive index, alternately stacked with the plurality of first auxiliary films along a thickness direction of the base substrate.

2. The organic light emitting display device as claimed in claim 1 , wherein:
each of the plurality of organic light emitting diodes includes an organic light emitting layer which emits a base light,
the first inorganic film transmits the base light to transmit and reflects a first light emitted from the quantum dot layer, and
the first light has a first wavelength different from a wavelength of the base light.

3. The organic light emitting display device as claimed in claim 2 , wherein:
the plurality of first auxiliary films includes TiO 2 ; and
the plurality of second auxiliary films includes SiO 2 .

4. The organic light emitting display device as claimed in claim 2 , wherein the thin film encapsulation part further includes a second inorganic film on the first inorganic film with the organic film therebetween, the second inorganic film including:
a plurality of third auxiliary films, each having a third refractive index; and
a plurality of fourth auxiliary films, each having a fourth refractive index different from the third refractive index, alternately stacked with the plurality of third auxiliary films.

5. The organic light emitting display device as claimed in claim 4 , wherein:
the plurality of the first auxiliary films and the plurality of the second auxiliary films are stacked in the thickness direction of the base substrate; and
the plurality of the third auxiliary films and the plurality of the fourth auxiliary films are stacked in the thickness direction of the base substrate.

6. The organic light emitting display device as claimed in claim 4 , wherein:
a first pixel area, a second pixel area, and a third pixel area are defined in the base substrate; and
the quantum dot layer includes first quantum dots in the first pixel area that convert the base light into the first light and second quantum dots in the second pixel area that convert the base light into a second light having a second wavelength different from the wavelength of the base light and the first light.

7. The organic light emitting display device as claimed in claim 6 , wherein the second inorganic film transmits the base light and reflects the second light.

8. The organic light emitting display device as claimed in claim 6 , wherein the first and the second quantum dots are excluded from the third pixel area.

9. The organic light emitting display device as claimed in claim 6 , wherein the first wavelength is longer than the second wavelength and the second wavelength is longer than the wavelength of the base light.

10. The organic light emitting display device as claimed in claim 6 , wherein the base light has blue color, the first light has red color, and the second light has green color.

11. The organic light emitting display device as claimed in claim 4 , wherein:
the plurality of the first auxiliary films and the plurality of the third auxiliary films include a same first composition material; and
the plurality of the second auxiliary films and the plurality of the fourth auxiliary films include a same second composition material.

12. The organic light emitting display device as claimed in claim 4 , wherein a sum of the thickness of one of the plurality of the first auxiliary films and the thickness of one of the plurality of the second auxiliary films is greater than a sum of the thickness of one of the plurality of the third auxiliary films and the thickness of one of the plurality of the fourth auxiliary films.

13. The organic light emitting display device as claimed in claim 4 , wherein:
the first and third auxiliary films include at least one of a silicon carbon nitride (SiCN) or a silicon oxide (SiOx); and
the second and fourth auxiliary films include a silicon nitride (SiNx).

14. The organic light emitting display device as claimed in claim 6 , further comprising:
a first color filter in the first pixel area above the pixel layer with the quantum dot layer therebetween; and
a second color filter in the second pixel area above the pixel layer with the quantum dot layer therebetween, wherein the first color filter blocks the base light and transmits the first light, and the second color filter blocks the base light and transmits the second light.

15. The organic light emitting display device as claimed in claim 6 , further comprising:
a color filter in the first and second pixel areas above the pixel layer with the quantum dot layer therebetween, wherein the color filter blocks the base light and transmits the first light and the second light.

16. The organic light emitting display device as claimed in claim 6 , wherein the organic light emitting layer is a continuous film from the first to third pixel areas.

17. The organic light emitting display device as claimed in claim 1 , further comprising:
a window assembly above the thin film encapsulation part with the quantum dot layer therebetween and exposed to the outside;
an adhesive layer between the thin film encapsulation part and the quantum dot layer; and
a second inorganic layer between the adhesive layer and the quantum dot layer.

18. The organic light emitting display device as claimed in claim 1 , wherein the thin film encapsulation part covers the side parts of the pixel layer.

19. The organic light emitting display device as claimed in claim 1 , wherein the second inorganic film is closer to the quantum dot layer than the first inorganic film.

20. The organic light emitting display device as claimed in claim 1 , wherein:
the thin film encapsulation part includes a second inorganic film,
the first inorganic film selectively reflects light of a first color, and
the second inorganic film selectively reflects light of a second color, different from the first color.

21. The organic light emitting display device as claimed in claim 20 , wherein the first color is green and the second color is red.

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Chungsock
• Cho Sanghwan

Classifications

• G09G2300/0421

  Structural details of the set of electrodes · CPC title

• H01L27/3258 Primary

  Electricity · mapped topic

• G09G3/3233

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• H01L27/322

  Electricity · mapped topic

• H01L51/5275

  Electricity · mapped topic