Video hologram and device for reconstructing video holograms for large objects
AssigneeSeeReal Technologies S.A.
InventorArmin Schwerdtner
Life of this patent
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Abstract
A video holographic display device operates so that the size of a reconstructed three dimensional scene is a function of the size of the hologram-bearing medium; the reconstructed three dimensional scene can then be anywhere within a volume defined by the hologram-bearing medium and a virtual observer window through which the reconstructed three dimensional scene must be viewed. This contrasts with conventional holograms, in which the size of the reconstructed scene is localised to a far smaller volume and is not a function of the size of the hologram-bearing medium at all.
Claims19
A display device for video holography, in which the device enables a holographic reconstruction of a three dimensional scene, made up of multiple discrete points, to be generated;
- the device including a light source and an optical system to illuminate a spatial light modulator encoded with a hologram;
- wherein the size of the reconstructed three dimensional scene is a function of the size of the spatial light modulator because the reconstructed three dimensional scene is anywhere within a volume spanned by the spatial light modulator and a virtual observer window through which the reconstructed three dimensional scene must be viewed
- and in which the spatial light modulator is controlled such that, when a hologram comprises a region with information needed to reconstruct a single point in the three dimensional scene, the point being visible from the virtual observer window, then the region (a) encodes information for that single point in the reconstructed three dimensional scene and (b) is the only region in the hologram encoded with information for that point, and (c) is restricted in size to form a portion of the entire hologram, the size being such that multiple reconstructions of that point caused by higher diffraction orders are not visible at the virtual observer window.
A method of generating a holographic reconstruction of a three dimensional scene, made up of multiple discrete points, using a display device and a computer, the device including a light source and an optical system to illuminate a spatial light modulator;
- comprising the steps of:
- (a) using the computer to encode a hologram on the spatial light modulator;
- (b) arranging the optical system and the hologram such that the size of the reconstructed three dimensional scene is a function of the size of the spatial light modulator because the reconstructed three dimensional scene is anywhere within a volume spanned defined by the spatial light modulator and a virtual observer window through which the reconstructed three dimensional scene must be viewed;
- and
- (c) controlling the spatial light modulator such that, when a hologram comprises a region with information needed to reconstruct a single point in the three dimensional scene, the point being visible from the virtual observer window, then the region (a) encodes information for that single point in the reconstructed three dimensional scene and (b) is the only region in the hologram encoded with information for that point, and (c) is restricted in size to form a portion of the entire hologram, the size being such that multiple reconstructions of that point caused by higher diffraction orders are not visible at the virtual observer window.
Dependencies are inferred from the claim text.