Organic EL display
View Patent ↗Disclosed is a coated type organic EL display wherein the light extraction efficiencies of all organic light-emitting elements are improved even when the organic light-emitting elements have different organic light-emitting layers for respective emission colors. Specifically disclosed is an organic EL display which comprises a substrate and a red organic light-emitting element (R), a green organic light-emitting element (G), and a blue organic light-emitting element (B) arranged on the substrate. Each organic light-emitting element has a pixel electrode that is a reflective electrode, a functional layer formed on the pixel electrode by coating, an organic light-emitting layer arranged on the functional layer, a counter electrode that is a transparent electrode arranged on the organic light-emitting layer, and a tapered bank that defines the functional layer formed by coating. A dimension of a bank-to-bank gap at a top of the bank differs among the R, G, and B elements.
1. An organic EL display comprising:
a substrate;
an organic light emitting element R which is arranged on the substrate and which is configured to emit red light;
an organic light emitting element G which is arranged on the substrate and which is configured to emit green light; and
an organic light emitting element B which is arranged on the substrate and which is configured to emit blue light, wherein:
each of the organic light emitting elements includes a pixel electrode which is a reflective electrode, a function layer which is formed by coating on the pixel electrode, an organic light emitting layer which is arranged on the function layer, a counter electrode which is a transparent electrode and is arranged on the organic light emitting layer, and a partition wall comprising a tapered bank which defines a region in which the function layer is formed;
a dimension of a bank-to-bank gap at a top of the bank differs among the element R, the element G and the element B.
2. The organic EL display according to claim 1 , wherein:
a volume of the function layer differs among the element R, the element G and the element B,
among the element R, the element G and the element B, one element having a greatest amount of the functional material has a greatest dimension of a bank-to-bank gap at a top of the banks, and
among the element R, the element G and the element B, another one element having a smallest amount of the functional material has a smallest dimension of a bank-to-bank gap at a top of the banks.
3. The organic EL display according to claim 1 , wherein the function layer formed by coating is an electron block layer or a hole transport layer.
4. The organic EL display according to claim 1 , wherein the function layer formed by coating is a hole injection layer.
5. The organic EL display according to claim 1 , wherein a thickness of the function layer formed by coating varies between the element R, the element G and the element B.