Light guide employing multilayer optical film
First Claim
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1. A light guide, comprising in cross-section:
- (a) a non-light emitting portion comprising multiple layers of;
(i) a first substantially non-absorptive longitudinally specular light reflector;
(ii) a second substantially non-absorptive longitudinally specular light reflector;
each one of said layers having a selected index of refraction which differs from the indices of refraction of layers immediately adjacent said one of said layers, such that said multiple layers collectively have high longitudinally specular reflectivity;
(b) a light emitting portion comprising prism light guide wall material; and
,(c) a substantially non-absorptive light scattering means positioned within said non-light emitting portion in opposition to said light emitting portion.
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Abstract
A light guide having a non-light emitting portion made up of multiple layers of first and second substantially non-absorptive longitudinally specular light reflector materials. The index of refraction of each layer differs from the indices of refraction of the immediately adjacent layers, such that the layers collectively have high longitudinally specular reflectivity. The light guide also has a light emitting portion made of prism light guide wall material. A substantially non-absorptive light scattering mechanism is positioned within the non-light emitting portion in opposition to the light emitting portion.
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Citations
21 Claims
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1. A light guide, comprising in cross-section:
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(a) a non-light emitting portion comprising multiple layers of; (i) a first substantially non-absorptive longitudinally specular light reflector; (ii) a second substantially non-absorptive longitudinally specular light reflector; each one of said layers having a selected index of refraction which differs from the indices of refraction of layers immediately adjacent said one of said layers, such that said multiple layers collectively have high longitudinally specular reflectivity; (b) a light emitting portion comprising prism light guide wall material; and
,(c) a substantially non-absorptive light scattering means positioned within said non-light emitting portion in opposition to said light emitting portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A light guide, comprising in cross-section:
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(a) a non-light emitting portion comprising layers of first and second substantially non-absorptive polymers, said first and second polymers differing in composition such that said layers collectively have high longitudinally specular reflectivity; (b) a light emitting portion comprising prism light guide wall material; and
,(c) a substantially non-absorptive light scattering means positioned within said non-light emitting portion in opposition to said light emitting portion. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A light guide, comprising in cross-section:
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(a) a non-light emitting portion comprising multiple layers of; (i) a first substantially non-absorptive longitudinally specular light reflector; (ii) a second substantially non-absorptive longitudinally specular light reflector; each one of said layers having a stress induced birefringence such that said multiple layers are birefringent over a range of uniaxial to biaxial orientation of said layers and such that said multiple layers collectively have high longitudinally specular reflectivity; (b) a light emitting portion comprising prism light guide wall material; and
,(c) a substantially non-absorptive light scattering means positioned within said non-light emitting portion in opposition to said light emitting portion. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification