Light guide optical assembly
First Claim
1. An apparatus for optical aperture expansion comprising:
- (a) at least one lightguide, said lightguide including a first pair of external surfaces parallel to each other for guiding light by internal reflection;
(b) a set of three optical components associated with said at least one lightguide, said set including;
(i) a pair of first and second matching diffractive optical components; and
(ii) a reflective optical component including a set of facets, said set of facets;
(A) including a plurality of partially reflecting facets parallel to each other,(B) between said first pair of external surfaces, and(C) non-parallel relative to said first pair of external surfaces; and
(c) said components cooperating for expanding coupled-in light to coupled-out light,(i) said coupled-in light being light coupled into said at least one lightguide, and(ii) said expanding being two-dimensional.
1 Assignment
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Accused Products
Abstract
An optical assembly for optical aperture expansion combines facet reflective technology with diffractive technology. At least two diffractive components having opposite optical power (matching) are used, so that chromatic dispersion introduced by the first diffractive component will then be cancelled by the second diffractive component. The two diffractive components are used in combination with a reflective optical component to achieve more efficient aperture expansion (for near eye display), reducing distortions and noise, while also reducing design constraints on the system and individual components, as compared to conventional techniques. The assembly eliminates and/or reduces the need for polarization management, while enabling wider field of view. In addition, embodiments can have reduced nonuniformity, as compared to conventional single technology implementations, since the distortion patterns of the two technologies do not correlate.
219 Citations
8 Claims
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1. An apparatus for optical aperture expansion comprising:
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(a) at least one lightguide, said lightguide including a first pair of external surfaces parallel to each other for guiding light by internal reflection; (b) a set of three optical components associated with said at least one lightguide, said set including; (i) a pair of first and second matching diffractive optical components; and (ii) a reflective optical component including a set of facets, said set of facets; (A) including a plurality of partially reflecting facets parallel to each other, (B) between said first pair of external surfaces, and (C) non-parallel relative to said first pair of external surfaces; and (c) said components cooperating for expanding coupled-in light to coupled-out light, (i) said coupled-in light being light coupled into said at least one lightguide, and (ii) said expanding being two-dimensional. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification