Organic light emitting diode display capable of realizing full color
View Patent ↗An OLED display for improving white light emitting efficiency and simplifying a manufacturing process includes a plurality of pixels, each of the pixels having a transistor unit, a color filter unit and an organic light emitting device unit. The transistor unit converts signals from the outside into driving signals for driving an organic light emitting device unit. The organic light emitting device unit is composed of blue, red and green emission layers each having different areas. By passing white light through a color filer, the OLED display can realize full color.
1. A method of manufacturing an organic light emitting diode display, comprising:
providing a substrate including a gate electrode, a data electrode, a power source electrode and a color filter;
forming a first electrode on the substrate;
applying a photoresist on the substrate;
forming a protrusion around an emission region by exposing and developing the photoresist to expose at least a part of the photoresist around the emission region;
forming a first emission layer by applying a first light emitting material at a first angle to a substrate surface;
forming a second emission layer on the first emission layer by applying a second light emitting material at a second angle to the substrate surface, wherein the second angle differs from the first angle; and
forming a second electrode on the first and second emission layers, wherein the first emission layer and the second emission layer overlapping each other in the emission region have different areas from each other.
2. The method of claim 1 , further comprising:
forming a third emission layer by applying a third light emitting material on the second emission layer at a third angle sloped to the substrate surface and different from the first and second angles before forming the second electrode.
3. The method of claim 2 , wherein the second angle is larger than the first angle, and wherein the third angle is larger than the second angle.
4. The method of claim 3 , wherein the third angle is substantially perpendicular to the substrate surface.
5. The method of claim 2 , wherein the second angle is smaller than the first angle, and wherein the third angle is smaller than the second angle.
6. The method of claim 5 , wherein the first angle is substantially perpendicular to the substrate surface.
7. The method of claim 2 , wherein the first, second and third emission layers have first, second and third thicknesses, respectively, and wherein a sum of the first, second and third thicknesses is equal to or less than a height of the protrusion.
8. The method of claim 2 , wherein the first emission layer emits a blue light.
9. The method of claim 2 , wherein the color filter is overlapped with the first, second and third emission layers.
10. A method of manufacturing an organic light emitting diode display, comprising:
providing a gate electrode, a data electrode, a power source electrode and a color filter on a substrate;
forming a first electrode on the substrate;
forming a protrusion around an emission region;
forming a first emission layer by applying a first light emitting material at a first angle to the substrate surface;
forming a second emission layer on the first emission layer by applying a second light emitting material at a second angle to the surface of the substrate, wherein the second angle differs from the first angle; and
forming a second electrode on the first and second emission layers, wherein the first emission layer and the second emission layer overlapping each other in the emission region have different areas from each other.
11. The method of claim 1 , wherein a light emitting efficiency of the first emission layer is greater than a light emitting efficiency of the second emission layer.
12. The method of claim 10 , wherein a light emitting efficiency of the first emission layer is greater than a light emitting efficiency of the second emission layer.