Organic electroluminescent device

• US 9,704,933 B2
• Filed: 05/05/2015
• Issued: 07/11/2017
• Est. Priority Date: 05/13/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Sato, Toshihiro
• Primary Examiner(s): Williams, Alexander Oscar
• Application Number:
  US14/704,670
• Publication Number:
  US 20150333292A1
• Time in Patent Office: 798 Days
• Field of Search: 257 40, 257359, 257 79, 257 81
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/873 Encapsulations
• CPC Class Codes: H10K 77/10 Substrates, e.g. flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

In an organic electroluminescent device, deterioration of an organic material layer of an OLED due to moisture and the like from a surrounding material is effectively prevented. An OLED is provided with an organic material layer including a light emitting layer and is provided on a lower substrate. A first diamond-like carbon layer is provided between the lower substrate and the organic material layer and is at least arranged in a light emitting area in a surface along the lower substrate. A second diamond-like carbon layer is provided above the organic material layer and is at least arranged in the light emitting area.

Claims

1. An organic display device comprising:

a substrate;

a first layer which is formed on the substrate and includes a TFT and a plurality of inorganic insulation film;

a first organic film on the first layer;

a first diamond-like carbon layer on the first organic film;

an organic light emitting element on the first diamond-like carbon layer;

a second diamond-like carbon layer on the organic light emitting element; and

a passivation film which is formed on the second diamond-like carbon layer and includes a first compound film made of silicon and nitride.

2. The organic display device according to claim 1,

wherein the organic light emitting element includes:

an anode;

an organic layer which is formed on the anode and includes an organic light emitting layer; and

a cathode on the organic layer, and

wherein the anode is in contact with the first diamond-like carbon layer.

3. The organic display device according to claim 1,

wherein a first thickness of the first diamond-like carbon layer is thinner than a second thickness of the second diamond-like carbon layer, and

wherein the second thickness is thinner than a third thickness of the passivation film.

4. The organic display device according to claim 1, wherein a first distance between an edge portion of the substrate and an edge portion of the first organic film is longer than a second distance between the edge portion of the substrate and an edge portion of the first diamond-like carbon layer, and

the first distance is longer than a third distance between the edge portion of the substrate and an edge portion of the second diamond-like carbon layer.

5. The organic display device according to claim 4, further comprising a bank insulation layer, wherein

the organic light emitting element includes:

an anode;

an organic layer which is formed on the anode and includes an organic light emitting layer; and

a cathode on the organic layer,

the bank insulation layer is formed between the anode and the organic light emitting layer, covers an edge portion of the anode, exposes a part of the anode, and is made of an organic material,

a fourth distance between the edge portion of the substrate and an edge portion of the bank insulation layer is longer than the second distance, and

the fourth distance is longer than the third distance.

6. The organic display device according to claim 5, having a display region including the organic light emitting element and a peripheral region surrounding the display region, wherein

a sealing structure is formed in the peripheral region by laminating the first diamond-like carbon layer and the second diamond-like carbon layer in this order without holding an organic material between them.

7. The organic display device according to claim 6, wherein the first diamond-like carbon layer, the cathode, and the second diamond-like carbon layer are laminated in this order the sealing structure.

8. The organic display device according to claim 6, wherein the first diamond-like carbon layer is in contact with the second diamond-like carbon layer in the sealing structure.

9. The organic display device according to claim 7, wherein

a fifth distance between the edge portion of the substrate and an edge portion of the cathode is shorter the second distance, and

the fifth distance is longer than the third distance.

10. The organic display device according to claim 7, wherein the passivation film includes:

a resin material on the first compound film; and

a second compound film made of silicon and nitride on the resin material.