Organic EL display
View Patent ↗An organic EL display includes an organic EL element including a pair of electrodes and an emitting layer interposed therebetween and having an optical resonator structure, and a coloring layer facing the organic EL element. A wavelength λ res of a light component with the maximum intensity that the organic EL element emits in a normal direction is shorter than a wavelength at which the coloring layer exhibits the maximum transmittance.
1. An organic EL display, comprising:
a first pixel having a first organic EL element and a first coloring layer;
a second pixel having a second organic EL element and a second coloring layer; and
a third pixel having a third organic EL element and a third coloring layer,
wherein each of the first to third coloring layers has a light absorption characteristic, and
wherein each of the first to third organic EL elements includes a front electrode facing the corresponding coloring layer, a back electrode, and an emitting layer interposed therebetween and having an optical resonator structure, the display being configured such that the first organic EL element emits a light whose maximum intensity wavelength λ res in a normal direction is shorter than that of the second organic EL element, the third organic EL element emits a light whose maximum intensity wavelength λ res in a normal direction is longer than that of the second organic EL element, a maximum transmittance wavelength λ max corresponding to a maximum transmittance T max of the first coloring layer is shorter than that of the second coloring layer, a maximum transmittance wavelength λ max corresponding to a maximum transmittance T max of the third coloring layer is longer than that of the second coloring layer, and the wavelength λ res of each of the first to third organic EL elements is shorter than the wavelength λ max of the corresponding coloring layer.
2. An organic EL display, comprising:
a first pixel having a first organic EL element and a first coloring layer;
a second pixel having a second organic EL element and a second coloring layer; and
a third pixel having a third organic EL element and a third coloring layer,
wherein each of the first to third organic EL elements includes a front electrode facing the corresponding coloring layer, a back electrode, and an emitting layer interposed therebetween and having an optical resonator structure, the display being configured such that the first organic EL element emits a light whose maximum intensity wavelength λ res in a normal direction is shorter than that of the second organic EL element, the third organic EL element emits a light whose maximum intensity wavelength λ res in a normal direction is longer than that of the second organic EL element, a maximum transmittance wavelength λ max corresponding to a maximum transmittance T max of the first coloring layer is shorter than that of the second coloring layer, a maximum transmittance wavelength λ max corresponding to a maximum transmittance T max of the third coloring layer is longer than that of the second coloring layer, and the wavelength λ res of each of the first to third organic EL elements is shorter than the wavelength λ max of the corresponding coloring layer, wherein the display is configured such that in each of the first to third pixels, the wavelength λ res is equal to or shorter than a wavelength λ 90 at which the corresponding coloring layer exhibits a transmittance T 90 ,
the transmittance T 90 being 90% of the transmittance T max , and
the wavelength λ 90 being shorter than the wavelength λ max .
3. The display according to claim 1 ,
wherein, in each of the first to third pixels, the emitting layer emits white light.
4. The display according to claim 1 , wherein
each of the first to third pixels further comprises a light-scattering layer facing the organic EL element with the coloring layer interposed therebetween.
5. An organic EL display, comprising:
first to third pixels each comprising an organic EL element having an optical resonator structure and a coloring layer facing the organic EL element, the organic EL element including an emitting layer emitting white light, and the coloring layer having a light absorption characteristic; and
a light-scattering layer facing the organic EL element with the coloring layer interposed therebetween, the display being configured such that the first pixel emits a light whose maximum intensity wavelength in a normal direction is shorter than the second pixel, and the third pixel emits a light whose maximum intensity wavelength in a normal direction is longer than that of the second pixel, a first organic EL element emits a light whose maximum intensity wavelength λ res in a normal direction is shorter than that of a second organic EL element, and a third organic EL element emits a light whose maximum intensity wavelength λ res in a normal direction is longer than that of the second organic EL element, and the wavelength λ res of each of the first to third organic EL elements is shorter than a wavelength λ max at which the corresponding coloring layer exhibits a maximum transmittance T max .
6. The display according to claim 5 , wherein
the light-scattering layer contains an inorganic material with light transmission properties.