ORGANIC EL DISPLAY DEVICE

• US 20150090992A1
• Filed: 09/30/2014
• Published: 04/02/2015
• Est. Priority Date: 10/01/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: MIYAZAWA, Toshio, MIYAMOTO, Mitsuhide, TOYODA, Hironori, TAKAHASHI, Kouhei, NISHIMURA, Masumi
• Granted Patent: US 9,287,526 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/878 comprising reflective means

Abstract

In an organic EL display device having plural organic EL elements each including an organic light emitting layer, an upper electrode formed on an upper side of the organic light emitting layer, and a reflective layer formed on a lower side of the organic light emitting layer, in which an image is displayed on a side of the organic light emitting layer on which the upper electrode is formed. The reflective layer in each of the organic EL elements includes a first plane, a second plane formed on a side lower than the first plane; and an inclined plane formed between the first plane and the second plane, and linearly inclined at a given angle equal to or higher than 35°, and equal to or lower than 55°.

Claims

1. An organic EL display device, comprising:

a plurality of organic EL elements each including;

an organic light emitting layer;

an upper electrode that is formed on an upper side of the organic light emitting layer; and

a reflective layer that is formed on a lower side of the organic light emitting layer, in which an image is displayed on a side of the organic light emitting layer on which the upper electrode is formed,

wherein the reflective layer in each of the organic EL elements includes;

a first plane;

a second plane that is formed on a side lower than the first plane; and

an inclined plane that is formed between the first plane and the second plane, and linearly inclined at a given angle equal to or higher than 35°

, and equal to or lower than 55°

.

2. The organic EL display device according to claim 1,

wherein the reflective layer includes a plurality of concave portions formed to be depressed on the basis of the first plane, respective side walls of the plurality of concave portions are configured by the inclined plane, and respective bottoms of the plurality of concave portions are configured by the second plane.

3. The organic EL display device according to claim 1,

wherein the given angle is equal to or higher than 40°

and equal to or lower than 50°

.

4. The organic EL display device according to claim 2,

wherein an insulating layer is formed between a lower electrode formed on a lower side of the organic light emitting layer, and the reflective layer, and

wherein the insulating layer is formed to planarize steps generated by the plurality of concave portions.

5. The organic EL display device according to claim 2,

wherein the upper electrode and the organic light emitting layer in the organic EL element are formed to be depressed at positions of the reflective layer where the plurality of concave portions are arranged.

6. The organic EL display device according to claim 2,

wherein the second plane formed in the bottom of each of the concave portions, and the first plane formed adjacent to the concave portion have a width of 1.5 times or higher and 2.5 times or lower of a width of the inclined plane formed between the second plane and the first plane.

7. The organic EL display device according to claim 2, further comprising:

a first substrate on which the plurality of organic EL elements are formed; and

a second substrate that seals the plurality of organic EL elements on the first substrate,

wherein the organic light emitting layer in the plurality of organic EL elements emit white light, and

wherein a color filter is formed on the second substrate.

8. The organic EL display device according to claim 2, further comprising:

a first substrate on which the plurality of organic EL elements are formed; and

a second substrate that seals the plurality of organic EL elements on the first substrate,

wherein a hollow layer is formed between the first substrate and the second substrate.