Image projection
AssigneeDualitas Ltd
InventorsJamieson Christmas, Máté Karner, Ruisheng Lin, Timothy Smeeton
Life of this patent
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Abstract
A diffractive structure arranged to spatially modulate light transformable by a viewing system into a target image. The diffractive structure is configured to generate a plurality of discrete light patterns. Each light pattern corresponds to a different part of the target image. The shape of each discrete light pattern substantially corresponds to the shape of an entrance aperture of the viewing system.
Claims18
A diffractive structure arranged to spatially modulate light transformable by a viewing system into an image, wherein the diffractive structure is configured to route light into a plurality of hologram channels, each hologram channel corresponding to a different sub-area of the image,
- wherein the diffractive structure comprises a plurality of pixels;
- wherein the diffractive structure is arranged to spatially modulate light in accordance with a hologram of an image;
- wherein the diffractive structure is arranged to divide content of the image by angle such that a central axis of each hologram channel propagates from the diffractive structure at different respective angles;
- wherein the diffractive structure is arranged such that each pixel of the diffractive structure contributes light to each of the hologram channels.
A method of calculating a hologram of an image, the method comprising at least one step including cropping light paths during calculation in accordance with the entrance pupil of the viewing system to form a hologram that, when illuminated, forms spatially modulated light, wherein continuous light channels of the spatially modulated light correspond with continuous regions of the image,
- wherein the hologram comprises a plurality of pixels;
- wherein the hologram is arranged to divide content of the image by angle such that a central axis of each hologram channel propagates from the hologram at different respective angles;
- and
- wherein the hologram is arranged such that each pixel of the hologram contributes light to each of the hologram channels.
A method of spatially modulating light to provide spatially modulated light transformable by a viewing system into an image, the method comprising:
- illuminating a diffractive structure with light;
- and
- spatially-modulating light using the diffractive structure, wherein the diffractive structure routes the spatially-modulated light into a plurality of hologram channels, each hologram channel corresponding to a different sub-area of the image,
- wherein the diffractive structure comprises a plurality of pixels;
- wherein the diffractive structure is spatially modulates light in accordance with a hologram of an image;
- wherein the diffractive structure divides content of the image by angle such that a central axis of each hologram channel propagates from the diffractive structure at different respective angles;
- wherein each pixel of the diffractive structure contributes light to each of the hologram channels.
Dependencies are inferred from the claim text.