Photosensitive insulating film of organic light emitting diode (OLED)

• US 6,841,266 B2
• Filed: 03/08/2002
• Issued: 01/11/2005
• Est. Priority Date: 03/08/2002
• Status: Expired due to Term

• Current Assignee: InnoLux Corporation
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chen, Man-Lin, Lin, Hsien-Kuang, Lu, Pa-Yen, Ku, Chun-Neng, Weng, Wen-Kuo
• Primary Examiner(s): GARRETT, DAWN L
• Application Number:
  US10/092,427
• Publication Number:
  US 20030170493A1
• Time in Patent Office: 1,040 Days
• Field of Search: 428/156, 428/167, 428/332, 428/690, 428/917, 313/505, 313/506, 313/509, 427/66, 430/311
• US Class Current: 428/690
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: Y10S 428/917 Electroluminescent
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/2457 Parallel ribs and/or grooves
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension

Abstract

Fabrication device of organic light emitting diode (OLED) includes a Substrate, a transparent conductive layer, an insulating film layer, an organic light-emitting layer, and a conductive layer; when a suitable potential is applied thereto, an organic light-emitting layer emits a visible light, however, it usually occurs breakdown between cathode and anode or bad signal, therefore, the present invention provides a positive insulating film photoresist with an easily inclining obtuse angle, smooth surface, and easily controlled fabrication condition to cover the edge of a transparent electrode (anode) in order to avoid that when the edge of ITO transparent electrode is sharp it causes an organic light-emitting layer film breakdown and results from signal lost or weaken to increase the yields.

Claims

1. A luminous device comprised of:

a substrate;

a plurality of transparent electrodes, in which a plurality of convex transparent electrodes are formed onto the substrate in ordered arrangement with an appropriate distance between each other, each electrode having an edge portion;

a conductive layer, which is located on the top layer of the luminous device and parallel to the substrate;

a plurality of insulating film layers wherein said plurality of insulating film layers are arranged to cover said edge portions of said electrodes and said plurality of insulating film layers are arranged to define a cavity above each electrode wherein each cavity has a bottom portion defined by said electrode and each cavity has two side portions defined by side portions of adjacent insulating film layers; and

each insulating film layer has an upper convex portion;

a hole-transport layer, on a hole-injection layer in an insulating film cavity;

a light-emitting layer, on the hole-transport layer in an insulating film cavity; and

an electron-transport layer, on the light-emitting layer in an insulating film cavity.

2. A luminous device of claim 1 wherein said the substrate is glass or a plastic film.

3. A luminous device of claim 1 wherein the thickness range of the insulating film layer is 50˜

5000 nm for a positive photoresist insulating film, and the composition of the insulating film includes phenolic resin, photoactive compound, thermosetting resin, catalyst, solvent, and an adhesive promoter.

4. A luminous device of claim 3 wherein the insulating positive photo resist film has a convex top face with a smooth convex ball face shape, and its convex angle is an inclining obtuse angle, forming a smooth gradient and gradually widening shape from the top face to a bottom face.

5. A luminous device of claim 3 wherein the insulating convex shape results from a method of postbake heated reflow.

6. A luminous device of claim 1 wherein said the material of a plurality of transparent electrodes can be selected from the group consisting of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

7. A luminous device of claim 1 wherein said the material of the conductive layer is selected from the grouping consisting of Al, Ca, Mg, Li, and lithium alloy.

8. A luminous device of claim 3 wherein said thermosetting resin is selected from the group consisting of melamine formaldehyde resins, benzoguanamine formaldehyde resins, and glycoluril formaldehyde resins.

9. A luminous device of claim 3 wherein said catalyst is acidic or is acidifiable.