Organic light emitting diode display and method for manufacturing the same
View Patent ↗An organic light emitting device including a first pixel, a second pixel, and a third pixel displaying different colors from each other according to the present invention is disclosed, wherein the organic light emitting device includes a substrate, a pixel electrode formed on the substrate, a reflecting electrode facing the pixel electrode, an emission layer disposed between the pixel electrode and the reflecting electrode, and a transflective member forming a micro-cavity along with the reflecting electrode, wherein a optical path length is a distance between the reflecting electrode and the transflective member, and the optical path lengths of at least two pixels among the first pixel, the second pixel, and the third pixel are the same, and the transflective member is removed in the white pixel.
1. An organic light emitting device comprising a first pixel, a second pixel, and a third pixel displaying different colors from each other, and a white pixel, wherein the organic light emitting device comprises:
a substrate;
a pixel electrode formed on the substrate;
a reflecting electrode facing the pixel electrode;
an emission layer disposed between the pixel electrode and the reflecting electrode; and
a transflective member;
wherein a optical path length is a distance between the reflecting electrode and the transflective member;
wherein optical path lengths of at least two of the first pixel, the second pixel, and
the third pixel are substantially the same; and
wherein the transflective member is not disposed in the white pixel.
2. The organic light emitting device of claim 1 , wherein the substrate and the pixel electrode of the white pixel contact each other.
3. The organic light emitting device of claim 2 , wherein:
the transflective member comprises a plurality of layers in which a first layer and a second layer having different refractive indices are alternately deposited.
4. The organic light emitting device of claim 3 , wherein
the optical path lengths of the first pixel and the second pixel are substantially the same, and
at least one layer is formed in the first pixel and in the second pixel but not in the third pixel.
5. The organic light emitting device of claim 4 , wherein
the first pixel is a red pixel, the second pixel is a blue pixel, and the third pixel is a green pixel.
6. The organic light emitting device of claim 5 , wherein:
the optical path length L 1 of the first pixel and the second pixel satisfies L 1 =mλ 1 /2=(m+1)λ 2 /2; and
the optical path length L 2 of the third pixel satisfies L 2 =mλ 3 /2,
where m is a natural number, λ 1 is a wavelength of the red region, λ 2 is a wavelength of the blue region, and λ 3 is a wavelength of the green region.
7. The organic light emitting device of claim 3 , wherein
the optical path lengths of the first pixel and the second pixel are substantially the same, and
at least one of the layers is formed in the third pixel, and is not disposed in from the first pixel and the second pixel.
8. The organic light emitting device of claim 7 , wherein
the first pixel is a red pixel, the second pixel is a blue pixel, and the third pixel is a green pixel.
9. The organic light emitting device of claim 8 , wherein:
the optical path length L 1 of the first pixel and the second pixel satisfies L 1 =mλ 1 /2=(m+1)λ 2 /2; and
the optical path length L 2 of the third pixel satisfies L 2 =(m+1)λ 3 /2,
wherein λ 1 is a wavelength of the red region, λ 2 is a wavelength of the blue region, and λ 3 is a wavelength of the green region.
10. The organic light emitting device of claim 1 , wherein the organic light emitting device further comprises:
a thin film transistor formed on the substrate, an insulating layer that is at least one of formed on and formed under the thin film transistor, and an overcoat formed on the insulating layer;
wherein the insulating layer is not disposed in the light emitting region of the white pixel.
11. The organic light emitting device of claim 10 , wherein
the insulating layer is not disposed in the light emitting regions of the first pixel, the second pixel, and the third pixel.
12. The organic light emitting device of claim 10 , wherein the overcoat is not disposed in the white pixel.
13. The organic light emitting device of claim 1 , further comprising color filters respectively formed in the first pixel, the second pixel, and the third pixel.
14. The organic light emitting device of claim 13 , wherein the emission layer comprises:
a plurality of sub-emission layers configured to emit light of different wavelengths;
wherein a white light is emitted by combining the light of different wavelengths.
15. The organic light emitting device of claim 3 , wherein at least one of the first layer and the second layer is not disposed in a portion of at least one of the first pixel, the second pixel, and the third pixel.
16. The organic light emitting device of claim 3 further comprising:
an overcoat disposed between the substrate and the transflective member, and
wherein one of the first layer and the second layer that is closer to the overcoat has a larger refractive index than the other.
17. The organic light emitting device of claim 16 , wherein the one layer of the first layer and the second layer that is closer to the overcoat comprises silicon nitride, and the other of the first layer and the second layer comprises silicon oxide.