Electroluminescent lamp using multilayer optical film
First Claim
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1. An electroluminescent lamp comprising:
- a) a light transmissive layer comprising a multilayer optical film, wherein the multilayer optical film reflects at least about 80% of normally incident visible light having a first polarization orientation and at least about 80% of visible light of the first polarization which is incident on the multilayer optical film at an angle of 60 degrees from normal, and further wherein the multilayer optical film transmits at least about 50% of normally incident visible light having a second polarization orientation, wherein the second polarization orientation is substantially orthogonal to the first polarization orientation;
b) a visible light-transmissive first conductive layer having first and second surfaces, the first surface of the first conductive layer proximate a first surface of the multilayer optical film;
c) a visible light-emitting layer comprising electroluminescent material, the light-emitting layer having first and second surfaces, the first surface of the light-emitting layer proximate the second surface of the first conductive layer; and
d) a second conductive layer having first and second surfaces, the first surface of the second conductive layer proximate the second surface of the light-emitting layer.
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Abstract
Electroluminescent lamps incorporating one or more multilayer optical films according to the present invention to polarize and/or reflect light. The multilayer optical films exhibit the ability to reflect significant amounts of normal and off-axis incident light.
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Citations
22 Claims
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1. An electroluminescent lamp comprising:
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a) a light transmissive layer comprising a multilayer optical film, wherein the multilayer optical film reflects at least about 80% of normally incident visible light having a first polarization orientation and at least about 80% of visible light of the first polarization which is incident on the multilayer optical film at an angle of 60 degrees from normal, and further wherein the multilayer optical film transmits at least about 50% of normally incident visible light having a second polarization orientation, wherein the second polarization orientation is substantially orthogonal to the first polarization orientation; b) a visible light-transmissive first conductive layer having first and second surfaces, the first surface of the first conductive layer proximate a first surface of the multilayer optical film; c) a visible light-emitting layer comprising electroluminescent material, the light-emitting layer having first and second surfaces, the first surface of the light-emitting layer proximate the second surface of the first conductive layer; and d) a second conductive layer having first and second surfaces, the first surface of the second conductive layer proximate the second surface of the light-emitting layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An electroluminescent lamp comprising:
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a) a visible light transmissive layer comprising a multilayer optical film, wherein the multilayer optical film reflects at least about 90% of normal visible light having a first polarization orientation and at least about 80% of visible light of the first polarization which is incident on the multilayer optical film at an angle of 60 degrees from normal, and further wherein the multilayer optical film transmits at least about 50% of normally incident visible light having a second polarization orientation, wherein the second polarization orientation is substantially orthogonal to the first polarization orientation; b) a visible light-transmissive first conductive layer having first and second surfaces, the first surface of the first conductive layer proximate a first surface of the multilayer optical film; c) a visible light-emitting layer comprising electroluminescent material, the light-emitting layer having first and second surfaces, the first surface of the visible light-emitting layer proximate the second surface of the first conductive layer; d) a second conductive layer having first and second surfaces, the first surface of the second conductive layer proximate the second surface of the light-emitting layer; and e) a back reflector having first and second surfaces, the first surface of the back reflector proximate the second surface of the second conductive layer, wherein the back reflector comprises a multilayer optical film that reflects at least about 90% of all normally incident visible light and at least about 80% of all visible light incident on the back reflector at an angle of 60 degrees from normal.
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16. An electroluminescent lamp comprising:
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a) a visible light transmissive layer comprising a multilayer optical film, the multilayer optical film comprising; 1) a first layer comprising an oriented birefringent, the first layer having an average thickness of not more than about 0.5 microns; and 2) a second layer of a selected polymer, each second layer having an average thickness of not more than 0.5 microns; b) a visible light-transmissive first conductive layer having first and second surfaces, the first surface of the first conductive layer proximate a first surface of the multilayer optical film; c) a visible light-emitting layer comprising electroluminescent material, the light-emitting layer having first and second surfaces, the first surface of the light-emitting layer proximate the second surface of the first conductive layer; and d) a second conductive layer having first and second surfaces, the first surface of the second conductive layer proximate the second surface of the light-emitting layer. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification