Organic EL display panel, and method for producing same
An organic EL display panel includes a substrate; an interlayer insulating layer on the substrate; first electrodes on the interlayer insulating layer to correspond to element formation regions in rows and columns; banks extending in columns to partition the regions in rows; organic light-emitting layers above the first electrodes, and each containing organic light-emitting material having light-emitting color differing between each two adjacent regions in rows; and second electrodes above the light-emitting layers, and being opposite in polarity to the first electrodes, wherein the interlayer insulating layer has first opening corresponding to interval between each two adjacent first electrodes in rows, the banks each have integrally formed buried part and main part, the buried part fills the interval and the first opening, and the main part is protrusion of the buried part and has recess on top thereof along with shapes of the interval and the first opening.
1. An organic EL display panel, comprising:
a substrate;
an interlayer insulating layer that is provided on the substrate;
first electrodes that are provided on the interlayer insulating layer so as to correspond one-to-one to element formation regions arranged in rows and columns above the substrate;
banks that are provided extending in columns to partition the element formation regions arranged in rows;
organic light-emitting layers that are provided above the first electrodes in one-to-one correspondence, and each contain an organic light-emitting material having a light-emitting color differing between each two adjacent element formation regions arranged in rows; and
second electrodes that are provided above the organic light-emitting layers in one-to-one correspondence, and are opposite in polarity to the first electrodes,
wherein the interlayer insulating layer has a first opening that corresponds in position to an interval between each two adjacent first electrodes in rows,
the banks each have a buried part and a main part that are integrally formed, the buried part fills the interval and the first opening, and the main part is a protrusion of the buried part,
the main part has, on a top surface directly opposite the buried part, a first recess having a corresponding shape to the first opening.
2. The organic EL display panel of claim 1 ,
wherein the organic light-emitting layers each result from applying ink containing the organic light-emitting material to one of the element formation regions, and drying the applied ink.
3. The organic EL display panel of claim 1 ,
wherein the banks are arranged in parallel rows at predetermined intervals.
4. The organic EL display panel of claim 3 ,
wherein the first recesses are formed in columns.
5. The organic EL display panel of claim 1 , further comprising:
banks that are provided extending in rows to partition the element formation regions arranged in columns.
6. The organic EL display panel of claim 5 ,
wherein the interlayer insulating layer has further provided therein a second opening that corresponds in position to an interval between each two adjacent first electrodes in columns,
the banks extending in rows each have a buried part and a main part that are integrally formed, the buried part fills the interval in columns and the second opening, and the main part is a protrusion of the buried part, and
the main part has, on a top thereof, a second recess along with the respective shapes of the interval in columns and the second opening.
7. The organic EL display panel of claim 1 ,
wherein the first recess has higher lyophilicity than a surface of the main part.
8. The organic EL display panel of claim 6 ,
wherein the second recess has higher lyophilicity than a surface of the main part.
9. The organic EL display panel of claim 1 , further comprising:
one or more functional layers that are provided between the first electrodes and the organic light-emitting layers,
wherein the functional layers each include a charge injection transport layer for injecting or transporting charge, and
the charge injection transport layer directly contacts the first electrodes and covers the interval between each two adjacent first electrodes in rows and an inner periphery of each of the first openings.
10. The organic EL display panel of claim 1 , further comprising
one or more functional layers that are provided between the first electrodes and the organic light-emitting layers,
wherein the functional layers each include a charge injection transport layer for injecting or transporting charge, and
the banks each contact the interval between each two adjacent first electrodes in rows and an inner periphery of each of the first openings.
11. The organic EL display panel of claim 1 ,
wherein the first recess has a depth equivalent to 10% to 100% of a length from an upper surface of the interlayer insulating layer to the top of the main part.
12. The organic EL display panel of claim 1 ,
wherein the first recess of the main part is located directly above the first opening of the interlayer insulating layer.
13. The organic EL display panel of claim 1 ,
wherein first openings are formed over the element formation regions.