Illuminator with polarization separating anisotropic layer between light guide and reflector
First Claim
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1. An illuminator comprising:
- a light guide having a first surface and a second surface;
a reflector arranged to reflect light, which has passed through the light guide and out of the first surface, through the first surface, the light guide and the second surface; and
a first anisotropic layer disposed in contact with the first surface and between the light guide and the reflector for separating substantially all of a first polarization state from a second polarization state orthogonal to the first state, the first anisotropic layer having a first refractive index which is substantially equal to or greater than a refractive index of the light guide and a second refractive index which is less than the refractive index of the light guide.
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Abstract
An illuminator includes a light guide in the form of a light pipe, one surface of which is provided with a polarization separating layer in the form of an anisotropic layer for separating substantially all of the light of one polarization from the orthogonal polarization component. The anisotropic layer is provided between the light pipe and a reflector. The layer has a first refractive index greater than or equal to that of the light pipe and a second refractive index less than that of the light pipe.
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Citations
17 Claims
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1. An illuminator comprising:
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a light guide having a first surface and a second surface; a reflector arranged to reflect light, which has passed through the light guide and out of the first surface, through the first surface, the light guide and the second surface; and a first anisotropic layer disposed in contact with the first surface and between the light guide and the reflector for separating substantially all of a first polarization state from a second polarization state orthogonal to the first state, the first anisotropic layer having a first refractive index which is substantially equal to or greater than a refractive index of the light guide and a second refractive index which is less than the refractive index of the light guide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification