Organic EL display unit

Patent metadata

Field	Value
Publication number	US-9530828-B2
Application number	US-201414889321-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	Jun 12, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

There is provided an organic EL display unit having superior light emission efficiency and superior display performance. This display unit includes two or more kinds of organic light-emitting devices, each of the organic light-emitting devices having a laminated configuration in which a first electrode layer, an organic layer, and a second electrode layer are laminated in order on a base, and the organic light-emitting devices configured to emit light of different colors. The organic layer includes a common light-emitting layer and an individual light-emitting layer, the common light-emitting layer shared by all of the kinds of organic light-emitting devices, and the individual light-emitting layer provided in only a kind configured to emit specific color light of the kinds of organic light-emitting devices. Some of the kinds of organic light-emitting devices each include a transparent conductive layer between the first electrode layer and the organic layer.

First claim

The invention claimed is:

1. An organic EL display unit comprising:
a plurality of organic light-emitting devices including a first organic light-emitting device, a second organic light-emitting device and a third organic light-emitting device, each of the organic light-emitting devices having a laminated configuration in which a first electrode layer, an organic layer, and a second electrode layer are laminated in order on a substrate, and the organic light-emitting devices configured to emit light of different colors,
wherein the organic layer includes at least one of a common light-emitting layer and an individual light-emitting layer, the common light-emitting layer shared by all the first, second and third organic light-emitting device, and the individual light-emitting layer only provided in the second and third organic light-emitting device,
wherein the second and third organic light-emitting devices each include a transparent conductive layer between the first electrode layer and the organic layer, and
wherein the transparent conductive layer is in contact with the substrate.

2. The organic EL display unit according to claim 1 , wherein
the individual light-emitting layer includes a first individual light-emitting layer and a second individual light-emitting layer,
wherein the first light-emitting device includes the first individual light-emitting layer configured to emit first color light,
wherein the second light-emitting device includes the second individual light-emitting layer configured to emit second color light,
wherein the third light-emitting layer includes the common light-emitting layer configured to emit third color light, and
wherein only both the first light-emitting device and the second light-emitting device, or only the first light-emitting device includes the transparent conductive layer.

3. The organic EL display unit according to claim 1 , wherein the organic layer includes one or more intermediate layers between the common light-emitting layer and the individual light-emitting layer.

4. The organic EL display unit according to claim 1 , wherein the individual light-emitting layer is provided between the common light-emitting layer and the first electrode layer.

5. The organic EL display unit according to claim 1 , wherein the organic layer includes a hole injection layer between the common light-emitting layer and the individual light-emitting layer, and the first electrode layer.

6. The organic EL display unit according to claim 5 , wherein the hole injection layer is in contact with both the individual light-emitting layer and the first electrode layer.

7. The organic EL display unit according to claim 5 , wherein the organic layer includes a hole transport layer between the common light-emitting layer and the individual light-emitting layer, and the hole injection layer.

8. The organic EL display unit according to claim 1 , wherein the organic layer includes an electron transport layer between the common light-emitting layer and the individual light-emitting layer, and the second electrode layer.

9. The organic EL display unit according to claim 8 , wherein the electron transport layer is in contact with both the common light-emitting layer and the second electrode layer.

10. The organic EL display unit according to claim 1 , wherein a spacing between the first electrode layer and the second electrode layer is narrowed with a decrease in a wavelength of an emission color.

11. The organic EL display unit according to claim 1 , wherein the second electrode layer is provided to be shared by all of the organic light-emitting devices.

12. The organic EL display unit according to claim 1 , wherein a layer other than the individual light-emitting layer in the organic layer is provided to be shared by all of the organic light-emitting devices.

13. The organic EL display unit according to claim 1 , wherein
the organic light-emitting devices include a red light-emitting device configured to emit red light, a green light-emitting device configured to emit green light, and a blue light-emitting device configured to emit blue light,
the red light-emitting device includes a red light-emitting layer as the first individual light-emitting layer,
the green light-emitting device includes a green light-emitting layer as the second individual light-emitting layer,
the blue light-emitting device includes a blue light-emitting layer as the common light-emitting layer,
only both the red light-emitting device and the green light-emitting device or only the red light-emitting device includes the transparent conductive layer, and the blue light-emitting device excludes the transparent conductive layer.

14. The organic EL display unit according to claim 1 , wherein thicknesses of all of the transparent conductive layers are equal.

15. The organic EL display unit according to claim 1 , wherein the transparent conductive layer is in contact with the first electrode layer.

16. The organic EL display unit according to claim 1 , wherein the transparent conductive layer is provided on a top surface and a side end surface of the first electrode layer.

17. The organic EL display unit according to claim 1 , wherein one of the first electrode layer and the second electrode layer has light transparency, and the other of them has light reflectivity.

Assignees

• Joled Inc

Inventors

• Matsumi Tatsuya

Classifications

• H10K59/876

  comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title

• H10K59/80518

  Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title

• H10K50/17

  Carrier injection layers · CPC title

• H10K59/123

  Connection of the pixel electrodes to the thin film transistors [TFT] · CPC title

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title