Organic light emitting display apparatus
An object of the present invention is to provide an organic light emitting element having a high efficiency and a high quality in which electron and hole injection efficiency of an electrode is reproduced in an insulated or contaminated first electrode. In an organic light emitting display apparatus, a substrate, a first electrode, an insulation film bank formed so as to cover edges of the first electrode, a metal thin film formed on the first electrode and the insulation film bank, an organic light emitting layer, and a second electrode are disposed in the cited order. A lower part of a side face of the insulation film bank takes a reverse tapered shape.
1. An organic light emitting display apparatus comprising:
a substrate;
a first electrode;
an insulation film bank formed so as to cover edges of said first electrode;
a metal thin film formed on said first electrode and said insulation film bank;
an organic light emitting layer; and
a second electrode, disposed in the recited order;
wherein a side face of said insulation film bank comprises a regular tapered part and a reverse tapered shape.
2. An organic light emitting display apparatus according to claim 1 , wherein the side face of said insulation film bank has a reverse tapered shape on a side located near said first electrode and has a regular tapered shape on a side located far from said first electrode.
3. An organic light emitting display apparatus according to claim 2 , wherein the side face having the reverse tapered shape is at a height in a range of 0.3 to 200 nm from said first electrode.
4. An organic light emitting display apparatus according to claim 2 , wherein a film thickness of said metal thin film is equal to two thirds or less of a height of the side face having the reverse tapered shape measured from said first electrode.
5. An organic light emitting display apparatus according to claim 1 , further comprising a plurality of pixels and thin film transistors for driving the pixels, wherein the organic light emitting display apparatus is active matrix type.
6. An organic light emitting display apparatus according to claim 5 , wherein the thin film transistors are polysilicon thin film transistors or amorphous silicon thin film transistors.