Organic light emitting display device

Patent metadata

Field	Value
Publication number	US-9978814-B2
Application number	US-201615296941-A
Country	US
Kind code	B2
Filing date	Oct 18, 2016
Priority date	Oct 30, 2015
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

An organic light-emitting display device. A substrate is divided into a plurality of subpixels generating different colors of light. A light leakage prevention layer is disposed on a portion of the substrate corresponding to a light-emitting area of at least one subpixel of the plurality of subpixels. An overcoat layer is disposed on a portion of the substrate corresponding to at least one subpixel of the plurality of subpixels, and includes microlenses having a plurality of concave portions or a plurality of convex portions. An organic electroluminescent device is disposed on the overcoat layer.

First claim

What is claimed is:

1. An organic light-emitting display device comprising:
a substrate;
a plurality of subpixels formed on the substrate, the subpixels generating different colors of light;
a light leakage prevention layer disposed on at least one subpixel of the plurality of subpixels;
an overcoat layer disposed on the light leakage prevention layer and including microlenses having a plurality of curved portions;
an organic electroluminescent device disposed on the overcoat layer; and
a bank pattern disposed on the overcoat layer and configured to define a light-emitting area, wherein the light leakage prevention layer corresponds to the light-emitting area.

2. The organic light-emitting display device according to claim 1 , wherein
the plurality of subpixels includes red, green, blue, and white subpixels, and
the light leakage prevention layer includes first to fourth light leakage prevention layers, each of the first to fourth light leakage prevention layers corresponding to a light-emitting area of a respective subpixel of the plurality of subpixels, at least one light leakage prevention layer of the first to fourth light leakage prevention layers being thinner than the other light leakage prevention layers of the first to fourth light leakage prevention layers.

3. The organic light-emitting display device according to claim 2 , wherein at least two light leakage prevention layers of the first to fourth light leakage prevention layers allow a same color of light to pass therethrough.

4. The organic light-emitting display device according to claim 2 , wherein at least one light leakage prevention layer of the first to fourth light leakage prevention layers allows at least one color of light to pass therethrough that is complementary to at least one color of light that is allowed to pass through at least one other light leakage prevention layer of the first to third light leakage prevention layers.

5. The organic light-emitting display device according to claim 2 , wherein the microlenses include first microlenses corresponding to a first subpixel of the plurality of subpixels and second microlenses corresponding to a second subpixel of the plurality of subpixels, the second microlenses being identical to or different from the first microlenses.

6. The organic light-emitting display device according to claim 5 , wherein the first and second microlenses differ in at least one of a diameter, a height, a full width half maximum, a slope, an aspect ratio and a distance between adjacent microlenses.

7. The organic light-emitting display device according to claim 5 , wherein the microlenses further include third microlenses corresponding to a third subpixel of the plurality of subpixels, the third microlenses being different from at least one of the first microlenses and the second microlenses.

8. The organic light-emitting display device according to claim 7 , wherein the third microlenses differ from the at least one of the first microlenses and the second microlenses in at least one of a diameter, a height, a full width half maximum, a slope, an aspect ratio and a distance between adjacent microlenses.

9. The organic light-emitting display device according to claim 1 , wherein the plurality of subpixels include red, green, blue, and white subpixels, the light leakage prevention layer being not disposed in at least one subpixel of the red, green, blue, and white subpixels.

10. The organic light-emitting display device according to claim 9 , wherein the microlenses are not disposed in the at least one subpixel of the red, green, blue, and white subpixels in which the light leakage prevention layer is not disposed.

11. The organic light-emitting display device according to claim 10 , wherein the at least one subpixel of the red, green, blue, and white subpixels in which neither the light leakage prevention layer nor the microlenses are disposed is the white subpixel.

12. The organic light-emitting display device according to claim 1 , wherein the microlenses are not disposed in at least one subpixel of the plurality of subpixels.

13. The organic light-emitting display device according to claim 1 , wherein the light leakage prevention layer disposed in the at least one subpixel of the plurality of subpixels includes first and second metal layers.

14. The organic light-emitting display device according to claim 13 , further comprising:
an insulating layer disposed on the substrate,
wherein the first metal layer is disposed on the insulating layer and includes one or more layers, and the second metal layer is disposed on the first metal layer and includes one or more layers.

15. The organic light-emitting display device according to claim 14 , wherein a permittivity of the first metal layer is negative, an absolute value of the permittivity of the first metal layer being greater than an absolute value of a permittivity of the insulating layer.

16. The organic light-emitting display device according to claim 14 , wherein the second metal layer is formed of at least one selected from the group consisting of silver, aluminum, and gold, and the first metal layer is formed of at least one selected from the group consisting of beryllium, calcium, barium, strontium, radium, lithium, sodium, and magnesium.

17. The organic light-emitting display device according to claim 13 , further comprising:
an insulating layer disposed on the second metal layer, wherein the first metal layer is disposed on the substrate in the at least one subpixel of the plurality of subpixels and the second metal layer is disposed on the first metal layer.

18. The organic light-emitting display device according to claim 17 , wherein a permittivity of the second metal layer is negative, an absolute value of the permittivity of the second metal layer being greater than an absolute value of a permittivity of the insulating layer.

19. The organic light-emitting display device according to claim 17 , wherein the first metal layer is formed of at least one selected from the group consisting of silver, aluminum, and gold, and the second metal layer is formed of at least one selected from the group consisting of beryllium, calcium, barium, strontium, radium, lithium, sodium, and magnesium.

20. The organic light-emitting display device according to claim 17 , wherein, in remaining subpixels of the plurality of subpixels other than the at least one subpixel, the insulating layer is disposed on the substrate, and the light leakage prevention layer is disposed on the insulating layer,
wherein a portion of the insulating layer disposed in the at least one subpixel is formed integrally with remaining portions of the insulating layer disposed in the remaining subpixels.

21. A method, comprising:
forming a plurality of subpixels on a substrate;
forming a light leakage prevention layer on at least one subpixel of the plurality of subpixels;
forming an overcoat layer over the light leakage prevention layer;
forming microlenses in the overcoat layer, the microlenses having a plurality of curved portions;
forming an organic electroluminescent device over the overcoat layer; and
forming a bank pattern on the overcoat layer, the bank pattern defining a light-emitting area, wherein the light leakage prevention layer corresponds to the light-emitting area.

22. The method of claim 21 , wherein forming the light leakage prevention layer comprises:
forming first, second, third and fourth light leakage prevention layers, each of

Assignees

• Lg Display Co Ltd

Inventors

• Jang Jihyang
• Lee Kangju
• Joung Seungryong
• Park Hansun
• Kim Sookang
• Jo Soyoung
• Jeon Seongsu
• Koo Wonhoe
• Lim Hyunsoo
• Park Jeaho
• Choi Mingeun
• Kim Hyunjoo
• Youn Wooram

Classifications

• H01L27/3213 Primary

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic

• H01L27/3272

  Electricity · mapped topic

• H01L51/5275

  Electricity · mapped topic

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title