ORGANIC EL ELEMENT AND METHOD FOR PRODUCTION THEREOF

• US 20180097050A1
• Filed: 10/02/2017
• Published: 04/05/2018
• Est. Priority Date: 10/05/2016
• Status: Active Grant

• Current Assignee: JDI Design and Development GK
• Original Assignee: JOLED Inc.
• Inventors: YOKOTA, Kazuhiro, SHIRAHASE, Hideyuki, KOMATSU, Takahiro, NISHIMURA, Masaki
• Granted Patent: US 10,644,082 B2
• Time in Patent Office: Days
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/816 Multilayers, e.g. transparent multilayers
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/135 using ink-jet printing

Abstract

An organic EL element includes a planarized layer arranged on a substrate, an insulation layer which is arranged on the planarized layer with the region corresponding to a subpixel of the planarized layer left exposed at least partly, a pixel electrode which has an opening that defines the region corresponding to the subpixel and which is arranged on a bank arranged on the insulation layer and on the exposed part of the planarized layer, a transparent conductive layer arranged on the pixel electrode, an emission layer arranged in the opening and above at least the transparent conductive layer, and a counter electrode arranged above the emission layer. The insulation layer is interposed between a bottom of the bank and the planarized layer. An upper surface of the planarized layer is coated with at least one of the pixel electrode and the insulation layer.

Claims

1. An organic EL element comprising:

a substrate;

a planarized layer arranged on the substrate;

an insulation layer of inorganic material which is arranged on the planarized layer in such a way that the region corresponding to a subpixel of the planarized layer is left exposed at least partly;

a pixel electrode which has an opening that defines the region corresponding to the subpixel and which is arranged on a bank arranged on the insulation layer and on the exposed part of the planarized layer;

a transparent conductive layer arranged on the pixel electrode;

an emission layer arranged in the opening and above at least the transparent conductive layer; and

a counter electrode arranged above the emission layer;

the insulation layer being interposed all over between a bottom of the bank and the planarized layer;

an upper surface of the planarized layer being coated with at least one of the pixel electrode and the insulation layer.

2. The organic EL element according to claim 1, wherein the insulation layer continuously extends from a part between the planarized layer and the bank to a part between a peripheral part of the pixel electrode and the planarized layer.

3. The organic EL element according to claim 1, wherein the insulation layer continuously extends from a part between the planarized layer and the bank to a part between a peripheral part of the pixel electrode and the transparent conductive layer.

4. The organic EL element according to claim 1, wherein a laminate including the pixel electrode and the transparent conductive layer has its peripheral part overlapped with the bank in the plan view.

5. The organic EL element according to claim 1, wherein a laminate including the pixel electrode and the transparent conductive layer is separate from the bank in the opening.

6. The organic EL element according to claim 1, wherein the insulation layer is formed from an inorganic material which has a higher light absorptivity than a light absorptivity of material for the bank.

7. The organic EL element according to claim 6, wherein the light-absorptive inorganic material is chromium oxide.