Organic EL display having color converting filters
View Patent ↗An organic EL display includes an organic EL device comprising lower electrodes, upper electrodes and an organic EL layer therebetween, and color-converting filter layers that absorb light emitted from the organic EL device and carry out color conversion, a layer having a color filter function of transmitting only the color of the light emitted from the organic EL device is provided between the color-converting filter layers and the organic EL device, whereby there is provided an organic EL display that has good display quality, with a high contrast ratio under illumination with a fluorescent lamp, sunlight or the like.
1. An organic EL display comprising:
an organic EL device including lower electrodes, upper electrodes, and an organic EL layer between the lower electrodes and upper electrodes;
color-converting filter layers that absorb light emitted from said organic EL device and carry out color conversion;
at least one layer selected from the group consisting of a protective layer, a passivation layer and a filler layer, the at least one layer being formed between the color-converting filter layers and the organic EL device; and
a material added to at least one of the protective layer, the passivation layer and the filler layer, the material causing the layer in which it is contained to transmit light that is the same color as the light emitted by the organic EL device,
wherein the light emitted by the EL device is blue to blue/green in color and the tranmissivity of the layer or layers containing the material is 80 to 90% at wavelengths of 450 to 510 nm and 20 to 30% at a wavelength around 600 nm.
2. The organic EL display according to claim 1 , wherein the material is added to the protective layer.
3. The organic EL device according to claim 2 , wherein the material added is a colorant or pigment.
4. The organic EL display according to claim 1 , wherein the material is added to the passivation layer.
5. The organic EL device according to claim 4 , wherein the passivation layer comprises an inorganic oxide or nitride and the material added to the passivation layer is a transition metal.
6. The organic EL display according to claim 1 , wherein the material is added to the filler layer.
7. The organic EL device according to claim 6 , wherein the material added is a colorant or pigment.
8. The organic EL device according to claim 1 , comprising at least two layers selected from the group consisting of a protective layer, a passivation layer and a filler layer, wherein the material is included in each of the at least two layers.
9. The organic EL device according to claim 8 , wherein a different material is added to each of the two layers.
10. The organic EL device according to claim 1 , comprising a protective layer, a passivation layer and a filler layer, wherein the material is included in at least two of the layers.
11. The organic EL device according to claim 10 , wherein the material is included in all three of the layers.
12. The organic EL device according to claim 1 , wherein the display is a top emission display.
13. The organic EL device according to claim 1 , wherein the display is a bottom emission display.
14. The organic EL device according to claim 1 , wherein the display comprises either a protection layer or a filler layer, and the material in the protection layer and/or the filler layer is a cyan colorant or pigment.
15. The organic EL device according to claim 1 , wherein (i) the display comprises at least two layers selected from the group consisting of a protective layer, a passivation layer and a filler layer, (ii) two or more of the layers contain the material, and (iii) the combination of layers have a transmissivity of 80 to 90% at wavelengths of 450 to 510 nm and 20 to 30% at a wavelength around 600 nm.