Asymmetric turning film with multiple light sources
First Claim
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1. An optical system, comprising:
- a first light source and a second light source having differently oriented light distributions;
an asymmetric turning film comprising a first major surface and a second major surface, wherein the first major surface is substantially smooth and the second major surface comprises a plurality of identical microstructures each comprising a first face having a first shape and a second face having a different second shape; and
a polarizer;
wherein light from the first light source is preferentially reflected by the first face but not the second face, and is transmitted through the second face;
wherein light from the second light source is preferentially reflected by the second face but not the first face, and is transmitted through the first face;
wherein the asymmetric turning film is laminated to the polarizer; and
wherein the first shape is substantially flat and the second shape is substantially curved.
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Abstract
Optical systems are disclosed. More particularly, optical systems including an asymmetric turning film (110) with at least a first (120) and second light source (130) are disclosed. Selection of geometries for the asymmetric turning film can enable different output viewing angles depending on the selective illumination of the first light source, the second light source, or both. The optical systems disclosed may be suitable in both luminaires and displays.
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Citations
13 Claims
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1. An optical system, comprising:
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a first light source and a second light source having differently oriented light distributions; an asymmetric turning film comprising a first major surface and a second major surface, wherein the first major surface is substantially smooth and the second major surface comprises a plurality of identical microstructures each comprising a first face having a first shape and a second face having a different second shape; and a polarizer; wherein light from the first light source is preferentially reflected by the first face but not the second face, and is transmitted through the second face; wherein light from the second light source is preferentially reflected by the second face but not the first face, and is transmitted through the first face; wherein the asymmetric turning film is laminated to the polarizer; and
wherein the first shape is substantially flat and the second shape is substantially curved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification