Organic electroluminescent display device having a planarizing layer and manufacturing method thereof

• US 7,733,015 B2
• Filed: 08/11/2006
• Issued: 06/08/2010
• Est. Priority Date: 08/23/2005
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Saito, Keishi
• Primary Examiner(s): Roy; Sikha
• Assistant Examiner(s): GREEN, TRACIE Y
• Application Number:
  US11/464,106
• Publication Number:
  US 20070046191A1
• Time in Patent Office: 1,397 Days
• Field of Search: None
• US Class Current: 313/506
• CPC Class Codes: H01L 27/1248 with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1201 Manufacture or treatment

Abstract

The present invention provides an organic EL display device having a planarizing layer, which is prevented from being distorted. The above organic EL display device has a planarizing layer, which retains 5% or less the oligomer used to form this layer.

Claims

1. An organic EL display device comprising:

light-emitting elements each having a laminate comprising a lower electrode, an organic layer comprising at least a light-emitting layer, and an upper electrode;

switching elements for controlling light emission and non-light emission of the light-emitting elements; and

a planarizing layer, which is disposed over the switching elements and under the lower electrodes,

wherein the planarizing layer comprises a polymer formed by polymerizing at least one oligomer such that the planarizing layer retains not more than 5% by weight of the at least one oligomer in a non-polymerized form.

2. The organic EL display device according to claim 1, wherein a surface hardness of the planarizing layer is from 0.3 to 0.6 GPa.

3. The organic EL display device according to claim 1, wherein a contact angle of the planarizing layer to water is 80°

or less.

4. The organic EL display device according to claim 1, wherein the planarizing layer comprises 150 ppm or less of a metal.

5. The organic EL display device according to claim 1, wherein the planarizing layer comprises an acrylic resin.

6. A method for manufacturing an organic EL display device, comprising the steps of:

forming a planarizing layer over switching elements disposed on a substrate; and

forming lower electrodes of light-emitting elements each having a laminate comprising a lower electrode, an organic layer comprising at least a light-emitting layer, and an upper electrode,

wherein the step of forming a planarizing layer comprises disposing at least one oligomer having a molecular weight of 500 to 5,000 and polymerizing the at least one oligomer such that the planarizing layer retains not more than 5% of the at least one oligomer in a non-polymerized form.

7. The method for manufacturing an organic EL display device according to claim 6, wherein the polymerization is performed by heat and/or light.

8. The method for manufacturing an organic EL display device according to claim 6, wherein a temperature during the polymerization is increased at a rate of 2 to 20°

C./minute.