ORGANIC EL DISPLAY PANEL AND METHOD FOR MANUFACTURING SAME
Disclosed is an organic EL display panel which has: a substrate; two or more pixel electrodes arranged on the substrate; a bus electrode, which is positioned beside at least one pixel electrode and is disposed on the substrate; an organic layer which is formed on the pixel electrode by means of a coating method; two or more banks, which are disposed on the substrate and define the arrangement region of the organic layer; and a counter electrode, which is disposed on the organic layer and is connected to the bus electrode. The two or more banks include a bank disposed between the bus electrode and the pixel electrode, and a bank disposed between the pixel electrodes, and the lyophilicity of the surface of the bank disposed between the bus electrode and the pixel electrode is lower than that of the bank disposed between the pixel electrodes.
1 . An organic EL display panel comprising:
a substrate;
at least two pixel electrodes disposed on the substrate;
a bus electrode disposed on the substrate, the bus electrode disposed adjacent to at least one of the pixel electrodes;
an organic layer disposed over the pixel electrodes;
at least two banks disposed on the substrate, the banks defining a region in which the organic layer is disposed; and
a counter electrode disposed over the organic layer, the counter electrode connected to the bus electrode,
wherein the at least two banks include a bank disposed between the bus electrode and the adjacent pixel electrode, and a bank disposed between the pixel electrodes, and
a lyophilicity of the bank disposed between the bus electrode and the adjacent pixel electrode is lower than a lyophilicity of the bank disposed between the pixel electrodes.
2 . The organic EL display panel according to claim 1 , wherein an anisole contact angle at an upper surface of the bank disposed between the pixel electrodes is 30° to 40°, and
an anisole contact angle at an upper surface of the bank disposed between the bus electrode and the adjacent pixel electrode is 40° to 55°.
3 . The organic EL display panel according to claim 1 , wherein the at least two banks each contain fluorine resin.
4 . The organic EL display panel according to claim 1 , further comprising a hole injection layer disposed over the pixel electrode,
wherein the organic layer includes a hole transport layer disposed on the hole injection layer, and an organic light-emitting layer disposed on the hole transport layer.
5 . An organic EL display panel comprising:
a substrate;
at least two pixel electrodes disposed on the substrate;
a bus electrode disposed on the substrate, the bus electrode disposed adjacent to at least one of the pixel electrodes;
an organic layer disposed over the pixel electrodes;
at least two banks disposed on the substrate, the banks defining a region in which the organic layer is disposed; and
a counter electrode disposed over the organic layer, the counter electrode connected to the bus electrode,
wherein the at least two banks include a bank disposed between the bus electrode and the adjacent pixel electrode, and a bank disposed between the pixel electrodes, and
a taper angle of the bank disposed between the bus electrode and the adjacent pixel electrode is smaller than a taper angle of the bank disposed between the pixel electrodes.
6 . The organic EL display panel according to claim 5 , wherein the taper angle of the bank disposed between the bus electrode and the adjacent pixel electrode is 20° to 30°, and
the taper angle of the bank disposed between the pixel electrodes is 30° to 60°.
7 . The organic EL display panel according to claim 5 , wherein the at least two banks each contain fluorine resin.
8 . The organic EL display panel according to claim 5 , further comprising a hole injection layer disposed over the pixel electrode,
wherein the organic layer includes a hole transport layer disposed on the hole injection layer, and an organic light-emitting layer disposed on the hole transport layer.
9 . A manufacturing method of an organic EL display panel, comprising:
providing a substrate having thereon at least two pixel electrodes and a bus electrode disposed adjacent to at least one of the pixel electrodes;
forming a photosensitive resin film on the substrate;
exposing and developing the photosensitive resin film to pattern at least two banks, the at least two banks including a bank disposed between the bus electrode and the adjacent pixel electrode, and a bank disposed between the pixel electrodes;
baking the at least two banks to secure the at least two banks to the substrate;
irradiating only the bank disposed between the pixel electrodes with active rays; and
applying an ink containing a material of an organic layer in a region which is positioned over the pixel electrodes and defined by the at least two banks, to form an organic layer.
10 . A manufacturing method of an organic EL display panel, comprising:
providing a substrate having thereon at least two pixel electrodes and a bus electrode disposed adjacent to at least one of the pixel electrodes;
forming a negative photosensitive resin film on the substrate;
exposing and developing the photosensitive resin film to pattern at least two banks, the at least two banks including a bank disposed between the bus electrode and the adjacent pixel electrode, and a bank disposed between the pixel electrodes;
re-exposing only the bank disposed between the pixel electrodes;
baking the at least two banks to secure the at least two banks to the substrate; and
applying an ink containing a material of an organic layer in a region which is positioned over the pixel electrodes and defined by the at least two banks, to form an organic layer.