Organic EL element with forward tapered bank containing fluorine resin

• US 8,008,860 B2
• Filed: 07/22/2009
• Issued: 08/30/2011
• Est. Priority Date: 05/31/2007
• Status: Active Grant

• Current Assignee: JDI Design and Development GK
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Kitamura, Yoshiro, Nagai, Hisao, Yoshida, Hidehiro, Nakatani, Shuhei
• Primary Examiner(s): Roy; Sikha
• Application Number:
  US12/507,134
• Publication Number:
  US 20090284146A1
• Time in Patent Office: 769 Days
• Field of Search: None
• US Class Current: 313/506
• CPC Class Codes: H10K 10/466 Lateral bottom-gate IGFETs comprising only a single gate
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• 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: H10K 71/12 using liquid deposition, e.g. spin coating
• CPC Class Codes: H10K 85/1135 Polyethylene dioxythiophene [PEDOT]; Derivatives thereof

Abstract

An organic EL display panel having a functional layer with a uniform film thickness is provided. The organic EL display panel of the present invention contains anode electrodes set on the substrate; organic EL layers set on the anode electrodes; line-state banks defining the organic EL layers in a line-state region; second banks defining two or more regions in the line-state region. The line-state banks and the second banks contain a fluorine resin, a fluorine concentration of the fluorine resin gradually changes along a thickness direction of each of the line-state bank and the second bank, and the fluorine concentration at a top of each of the line-state bank and the second bank is higher than the fluorine concentration at a bottom surface of each of the line-state bank and the second bank.

Claims

1. An organic EL element comprising:

a substrate;

an anode electrode with reflectivity set on the substrate;

an organic EL layer set on the anode electrode;

a cathode electrode being transparent set on the organic EL layer; and

a bank defining the organic EL layer;

wherein

the bank contains a fluorine resin,

the fluorine concentration at a top of the bank is higher than the fluorine concentration at a bottom surface of the bank,

the bank has a forward tapered shape, and

a height of the bank from the substrate is 0.8 to 1.2 μ

m.

2. The organic EL element according to claim 1, wherein the fluorine concentration at the top of the bank is 5 to 10 atom % and the fluorine concentration at the bottom surface of the bank is 0 to 3 atom %.

3. The organic EL element according to claim 1, wherein the bank has a taper angle of 35°

to 45°

.

4. The organic EL element according to claim 1, wherein an inclining surface of the bank has two inflection points.

5. An organic EL display panel comprising:

a plurality of organic EL elements according to claim 1 arranged in matrix state, wherein

the bank forms a line state bank defining a line state region on the substrate,

the organic EL layer is formed line state in the line state region.