ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF

• US 20120242218A1
• Filed: 02/28/2012
• Published: 09/27/2012
• Est. Priority Date: 03/25/2011
• Status: Abandoned Application

• Current Assignee: JOLED Inc.
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yoshinaga, Tadahiko, Matsumoto, Toshiki
• Application Number:
  US13/406,769
• Publication Number:
  US 20120242218A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/131 with spacer layers between the electroluminescent layers
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/441 in the presence of solvent vapors, e.g. solvent vapour annealing

Abstract

An organic electroluminescence display device includes: a first electrode provided over a substrate for each of first and second organic electroluminescence elements; a hole injection/transport layer provided over a whole surface of the first electrode, having at least one of hole injection and transportation characteristics; a second organic light emitting layer provided on an area on the hole injection/transport layer except an area opposed to the first organic electroluminescence element; a first organic light emitting layer provided over whole surfaces of the hole injection/transport and second organic light emitting layers; an electron injection/transport layer, provided over a whole surface of the first organic light emitting layer, having at least one of electron injection and transportation characteristics; a second electrode provided on the electron injection/transport layer; and a color filter provided over the second electrode, having a color or colors in an area above the second organic electroluminescence element.

Claims

1. An organic electroluminescence display device comprising:

a first electrode configured to be provided over a substrate for each of a first organic electroluminescence element of blue and a second organic electroluminescence element of another color;

a hole injection/transport layer configured to be provided over a whole surface of the first electrode and have a characteristic of at least one of hole injection and hole transportation;

a second organic light emitting layer of another color configured to be provided on an area on the hole injection/transport layer except an area opposed to the first organic electroluminescence element of blue;

a first organic light emitting layer of blue configured to be provided over whole surfaces of the hole injection/transport layer and the second organic light emitting layer;

an electron injection/transport layer configured to be provided over a whole surface of the first organic light emitting layer and have a characteristic of at least one of electron injection and electron transportation;

a second electrode configured to be provided on the electron injection/transport layer; and

a color filter configured to be provided over the second electrode and have a single color or a plurality of colors in at least part of an area above the second organic electroluminescence element.

2. The organic electroluminescence display device according to claim 1, wherein

a connection layer exists between the hole injection/transport layer and the first organic light emitting layer and between the second organic light emitting layer and the first organic light emitting layer.

3. The organic electroluminescence display device according to claim 2, wherein

the connection layer contains a low-molecular material.

4. The organic electroluminescence display device according to claim 1, wherein

the second organic light emitting layer has at least one peak wavelength in any region in a region from 500 nm to 750 nm.

5. The organic electroluminescence display device according to claim 1, wherein

light of at least two colors is extracted from a light emission color of the second organic light emitting layer by providing the color filter.

6. The organic electroluminescence display device according to claim 1, wherein

one pixel is composed of two sub-pixels formed by dividing a light emission color of the second organic light emitting layer into two colors by the color filter and a blue sub-pixel formed of the first organic electroluminescence element.

7. The organic electroluminescence display device according to claim 1, wherein

one pixel is composed of three sub-pixels formed by dividing a light emission color of the second organic light emitting layer into three colors by the color filter and a blue sub-pixel formed of the first organic electroluminescence element.

8. The organic electroluminescence display device according to claim 1, wherein

the hole injection/transport layer is provided as a common layer on the first electrodes of the first organic electroluminescence element and the second organic electroluminescence element across a whole surface.

9. A manufacturing method of an organic electroluminescence display device, the method comprising:

forming a plurality of first electrodes over a substrate for each of a first organic electroluminescence element of blue and a second organic electroluminescence element of another color;

forming a hole injection/transport layer that is provided over whole surfaces of the first electrodes and has a characteristic of at least one of hole injection and hole transportation by coating or evaporation;

forming a second organic light emitting layer of another color on an area on the hole injection/transport layer except an area opposed to the first organic EL element of blue by coating or evaporation;

forming a first organic light emitting layer of blue on the hole injection/transport layer and the second organic light emitting layer by an evaporation method;

forming an electron injection/transport layer having a characteristic of at least one of electron injection and electron transportation over a whole surface of the first organic light emitting layer by an evaporation method;

forming a second electrode over a whole surface of the electron injection/transport layer; and

forming a color filter that is provided over the second electrode and has a single color or a plurality of colors in at least part of an area above the second organic electroluminescence element of another color.

10. The manufacturing method of an organic electroluminescence display device according to claim 9, wherein

a connection layer is formed by evaporation between the hole injection/transport layer and the first organic light emitting layer and between the second organic light emitting layer and the first organic light emitting layer.

11. The manufacturing method of an organic electroluminescence display device according to claim 9, wherein

the coating is based on any of a spin coating method, an ink-jet method, a nozzle coating method, a slit coating method, and a microsyringe in each of which direct drawing is performed by a discharge system.

12. The manufacturing method of an organic electroluminescence display device according to claim 9, wherein

the coating is based on any of relief printing, flexo printing, offset printing, and gravure printing in each of which a plate is used.

13. The manufacturing method of an organic electroluminescence display device according to claim 9, wherein

the coating is based on a spray system in which an organic electroluminescence material is sprayed and applied to different areas separately from each other with use of a high-definition mask.

14. The manufacturing method of an organic electroluminescence display device according to claim 9, wherein

the second organic light emitting layer is formed by a metal mask method or a laser transfer method.