Organic EL display panel
View Patent ↗The present invention relates to an organic EL display panel having an organic light emitting layer having a uniform film thickness. The organic EL display panel of the present invention includes: a substrate; linear banks placed on the substrate and defining a linear region on the substrate; and at least two organic EL elements aligned in a row each linear region, and, each of the organic EL elements includes: an anode placed on the substrate; a hole injection layer formed with an metallic oxide and placed on the anode; an organic light emitting layer placed on the hole injection layer; and a cathode placed on the organic light emitting layer. The hole injection layer is concavely curved or convexly curved, the hole injection layer is partly placed under the banks; and the organic light emitting layer is formed by applying an organic light emitting material in the linear region.
1. An organic electro luminescence display panel comprising:
a substrate;
a linear bank placed on the substrate and defining a linear region on the substrate; and
at least two organic electro luminescence elements aligned in a row in the linear region, each organic luminescence element including:
an anode placed on the substrate;
a hole injection layer made of a metal oxide and placed on the anode;
an organic light emitting layer placed on the hole injection layer; and
a cathode placed on the organic light emitting layer;
wherein the hole injection layer is concavely curved or convexly curved;
an end of the hole injection layer is covered by the bank; and
the organic light emitting layer is formed by applying an organic light emitting material to the linear region.
2. The organic electro luminescence display panel according to claim 1 , wherein the hole injection layer is concavely curved.
3. The organic electro luminescence display panel according to claim 2 , wherein the concavely curved hole injection layer has a depth of 50 to 300 nanometers.
4. The organic electro luminescence display panel according to claim 2 , wherein the bank has a forward-tapered shape.
5. The organic electro luminescence display panel according to claim 4 , wherein:
a taper angle of the bank is 20 to 90 degrees;
a tilt angle of a tangent line at an edge of the concavely curved hole injection layer is 20 to 90 degrees as measured when the concavely curved hole injection layer is seen from a cross section which is perpendicular to a drawing direction of the linear bank.
6. The organic electro luminescence display panel according to claim 1 , wherein the metal oxide is tungsten oxide, molybdenum oxide, vanadium oxide or a combination thereof.
7. A manufacturing method of an organic electro luminescence display panel comprising the steps of:
providing a substrate;
forming at least two concavely curved parts or convexly curved parts on the substrate;
forming an anode on the concavely curved part or the convexly curved part;
forming a concavely curved or convexly curved hole injection layer on the anode;
forming a linear bank defining a linear region on the substrate, the bank covering an end of the hole injection layer, the two or more concavely curved parts or the convexly curved parts being arranged in the linear region; and
applying an ink containing an organic light emitting material to the linear region to form a linear organic light emitting layer, wherein
the hole injection layer is made of a metal oxide.
8. The manufacturing method of an organic electro luminescence display panel according to claim 7 , wherein the substrate has a photosensitive resin layer on a surface where the concavely curved parts or the convexly curved parts are formed.