Organic EL element with forward tapered bank containing fluorine resin
View Patent ↗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.
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 μm.
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.