ORGANIC LIGHT-EMITTING DIODE DISPLAY PANEL AND MANUFACTURING METHOD THEREOF

• US 20150372257A1
• Filed: 05/12/2014
• Published: 12/24/2015
• Est. Priority Date: 12/26/2013
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: ZHANG, Can
• Granted Patent: US 9,502,691 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

An organic light-emitting diode (OLED) display panel and manufacturing method thereof. The method of manufacturing the OLED display panel comprises forming an anode (2), an organic light-emitting layer (3), a cathode (4) and a first optical coupling layer (5) sequentially on a substrate (1), and forming a second optical coupling layer (6) on a side, away from the cathode (4), of the first optical coupling layer (5) by arranging a plurality of protrusion structures with arc-shaped surfaces. Light that would be totally reflected from a surface of the first optical coupling layer are transmitted out through the protrusion structures with the arc-shaped surfaces of the second optical coupling layer, therefore the total reflection of the light is reduced, the light extraction efficiency is increased, and the external quantum efficiency of the device is improved.

Claims

1. A method of manufacturing an organic light-emitting diode (OLED) display panel, comprising:

forming an anode, an organic light-emitting layer, a cathode and a first optical coupling layer sequentially on a substrate; and

forming a second optical coupling layer on a side, away from the cathode, of the first optical coupling layer by arranging a plurality of protrusion structures with arc-shaped surfaces.

2. The method of manufacturing the OLED display panel according to claim 1, further comprising implementing evaporation on the first optical coupling layer by using a first mask plate to form a second optical coupling layer,

wherein the first mask plate comprises a plurality of holes configured to evaporate the second optical coupling layer, and a wall of the holes is perpendicular to a surface of the first mask plate.

3. The method of manufacturing the OLED display panel according to claim 2, wherein the holes of the first mask plate are slits, and the slits are arranged in a direction that is perpendicular to a direction of slits arranged in the second mask plate used in a procedure of forming the organic light-emitting layer so that the protrusion structures with the arc-shaped surfaces formed by evaporation are strip-shaped semi-cylinders.

4. The method of manufacturing the OLED display panel according to claim 2, wherein each of the slits of the first mask plate has a width less than that of the second mask plate.

5. The method of manufacturing the OLED display panel according to claim 2, wherein the holes of the first mask plate are dot-like shaped so that the protrusion structures with the arc-shaped surfaces formed by evaporation are hemisphere-like shaped.

6. The method of manufacturing the OLED display panel according to claim 5, wherein the dot-like hole has an aperture that is less than the width of the slits on the second mask plate used in a procedure of forming the organic light-emitting layer.

7. The method of manufacturing the OLED display panel according to claim 1, wherein the first optical coupling layer and the second optical coupling layer has a respective thickness and refractive index, and a sum of a the thickness of the first optical coupling layer and that of the second optical coupling layer is λ

/4n, where λ

is an emission peak wavelength, n is the refractive index of the first optical coupling layer and the second optical coupling layer.

8. The method of manufacturing the OLED display panel according to claim 7, wherein n is greater than or equal to 1.8.

9. The method of manufacturing the OLED display panel according to claim 1, wherein the first optical coupling layer and the second optical coupling layer are formed by a material comprising any of ZnSe, TiO₂, SiO₂, Si₃N₄, or Alq₃, or a mixture of at least two thereof.

18. The method of manufacturing the OLED display panel according to claim 3, wherein each of the slits of the first mask plate has a width less than that of the second mask plate.

19. The method of manufacturing the OLED display panel according to claim 18, wherein the holes of the first mask plate are dot-like shaped so that the protrusion structures with the arc-shaped surfaces formed by evaporation are hemisphere-like shaped.

20. The method of manufacturing the OLED display panel according to claim 19, wherein the dot-like hole has an aperture that is less than the width of the slits on the second mask plate used in a procedure of forming the organic light-emitting layer.

10. An organic light-emitting diode (OLED) display panel, comprising:

an anode, an organic light-emitting layer, a cathode and a first optical coupling layer sequentially formed on a substrate; and

a second optical coupling layer formed on a side, away from the cathode, of the first optical coupling layer by arranging a plurality of protrusion structures with arc-shaped surfaces.

11. The OLED display panel according to claim 10, wherein the protrusion structures with the arc-shaped surfaces are strip-shaped semi-cylinders.

12. The OLED display panel according to claim 11, wherein each of the semi-cylinders has a diameter less than a width of a sub-pixel of the display panel.

13. The OLED display panel according to claim 10, wherein the protrusion structures with the arc-shaped surfaces are hemisphere-like shaped.

14. The OLED display panel according to claim 13, wherein the hemisphere has an aperture less than a width of a sub-pixel of the display panel.

15. The OLED display panel according to claim 10, wherein the first optical coupling layer and the second optical coupling layer have a respective thickness and refractive index, and a sum of a the thickness of the first optical coupling layer and that of the second optical coupling layer is λ

/4n, λ

is an emission peak wavelength, n is the refractive index of the first optical coupling layer and the second optical coupling layer.

16. The OLED display panel according to claim 15, wherein n is greater than or equal to 1.8.

17. The OLED display panel according to claim 10, wherein the first optical coupling layer and the second optical coupling layer are formed by a material comprising any of ZnSe, TiO₂, SiO₂, Si₃N₄, or Alq₃, or a mixture of at least two thereof.