Organic light emitting diode display panel and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9666649-B2
Application number	US-201414447160-A
Country	US
Kind code	B2
Filing date	Jul 30, 2014
Priority date	Jan 6, 2014
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

An organic light emitting diode display panel including an upper substrate, an organic light emitting device facing the upper substrate and emitting a light to the upper substrate, and a light extraction layer disposed between the upper substrate and the organic light emitting device, including first and second optical layers each having a polymer network liquid crystal and having different optical properties, and exiting the light to the outside of the upper substrate. The optical property of the polymer network liquid crystal in the first optical layer differs from the optical property of the polymer network liquid crystal in the second optical layer.

First claim

What is claimed is:

1. An organic light emitting diode display panel comprising:
an upper substrate;
an organic light emitting device facing the upper substrate and configured to emit light to the upper substrate; and
a light extraction layer disposed between the upper substrate and the organic light emitting device and configured to emit the light to the outside of the upper substrate, the light extraction layer comprising first and second optical layers each having a polymer network liquid crystal,
wherein the polymer network liquid crystal in the first optical layer has a first refractive index and the polymer network liquid crystal in the second optical layer has a second refractive index different from the first refractive index.

2. The organic light emitting diode display panel of claim 1 , wherein the second refractive index is greater than the first refractive index.

3. The organic light emitting diode display panel of claim 2 , wherein a difference between the first refractive index and the second refractive index is in a range of about 1.4 to about 2.

4. The organic light emitting diode display panel of claim 2 , wherein the polymer network liquid crystal of the second optical layer comprises a sheared polymer network liquid crystal.

5. The organic light emitting diode display panel of claim 4 , wherein a density of the polymer network liquid crystal of the second optical layer differs from a density of the polymer network liquid crystal of the first optical layer.

6. The organic light emitting diode display panel of claim 1 , wherein the second optical layer comprises a convex lens structure.

7. The organic light emitting diode display panel of claim 6 , further comprising a black matrix disposed on the upper substrate so as to at least partially define a display area and a non-display area,
wherein the convex lens structure faces the display area.

8. An organic light emitting diode display panel comprising:
an upper substrate;
an organic light emitting device facing the upper substrate and configured to emit light to the upper substrate; and
a light extraction layer disposed between the upper substrate and the organic light emitting device and configured to emit the light to the outside of the upper substrate, the light extraction layer comprising first and second optical layers each having a polymer network liquid crystal,
wherein the first optical layer has a first degree of haze, and the second optical layer has a second degree of haze different from the first degree of haze.

9. The organic light emitting diode display panel of claim 8 , wherein the second optical layer comprises an aligned polymer network liquid crystal.

10. The organic light emitting diode display panel of claim 9 , wherein the second degree of haze is less than the first degree of haze.

11. The organic light emitting diode display panel of claim 10 , further comprising a black matrix disposed on the upper substrate so as to at least partially define a display area and a non-display area.

12. The organic light emitting diode display panel of claim 11 , wherein:
the second optical layer is disposed in the non-display area; and
the first optical layer is disposed in the display area.

13. The organic light emitting diode display panel of claim 11 , wherein:
the first optical layer is disposed in the non-display area; and
the second optical layer is disposed in the display area.

14. The organic light emitting diode display panel of claim 11 , further comprising a plurality of the first and second optical layers,
wherein the first and second optical layers are alternately arranged in at least one of the display area and the non-display area, when viewed in a plan view.

15. The organic light emitting diode display panel of claim 8 , wherein the first and second optical layers are adjacent to each other in a direction substantially vertical to a thickness direction of the organic light emitting diode display panel.

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Jinwoo
• Bae Jongsung
• Lim Jaeik
• Park Wonsang

Classifications

• G02F1/133603

  with LEDs · CPC title

• G02B5/0278

  used in transmission · CPC title

• G02B5/3016

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02F1/133788

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title