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US 6,760,135 B1Granted
Holographic displays
AssigneeHolographic Imaging LLC
InventorsDouglas Payne, Christophe W. Slinger
Life of this patent
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Abstract
A holographic display comprises a source of coherent light and an Electrically Addressable Spatial Light Modulator (EASLM) in the path of the light source. The EASLM is arranged in use to be driven successively by a set of sub-holograms which together correspond to a holographic image. Light guiding means is arranged to guide light output from the EASLM such that the sub-holograms are displayed successively in respective tiled regions of an EASLM projection surface.
Claims11
A holographic display comprising:
- a source of coherent light;
- an Electrically Addressable Spatial Light Modulator (EASLM) in the path of the light source and arranged in use to display successively a set of sub-holograms which together correspond to a holographic image;
- and
- light guiding means arranged to guide modulated light output from the EASLM such that the sub-holograms appear successively in respective tiled regions of an EASLM projection surface, characterised in that
- the source of coherent light is arranged to illuminate the EASLM with an angle of incidence which depends upon the spatial position within the hologram of a sub-hologram being displayed, the angle being switched in synchronisation with the sub-hologram update rate of the EASLM.
2 more elements
A method of displaying a hologram, the method comprising:
- successively displaying on an Electrically Addressable Spatial Light Modulator (EASLM) a set of sub-holograms which together correspond to a holographic image;
- directing coherent light onto the EASLM;
- and
- guiding modulated light output from the EASLM such that the sub-holograms are displayed successively in respective tiled regions of an EASLM projection surface, characterised by the steps of
- illuminating the EASLM with said source of coherent light at an angle of incidence which depends upon the spatial position within the hologram of a sub-hologram being displayed, and switching the angle in synchronisation with the sub-hologram update rate of the EASLM.
2 more elements
Dependencies are inferred from the claim text.