NEAR-TO-EYE DISPLAY DEVICE
First Claim
Patent Images
1. A head-worn display device comprising:
- a computer unit;
at least one point light source mounted on the head-worn display device; and
at least one spatial light modulator (SLM) mounted on the head-worn display device and operatively coupled to the computer unit;
wherein light produced by the at least one point light source illuminates the SLM and gets modulated to produce modulated light, and the modulated light is directed on an exit pupil plane that includes a useful portion,wherein a light wave distribution within the useful portion is equal to a computed light distribution from a virtual scene,wherein the useful portion is steerable across the exit pupil plane to follow a motion of a user'"'"'s eye pupil relative to user'"'"'s eye when the head-worn display device is in use so that the user'"'"'s eye pupil acts as a spatial filter, andwherein the computer unit adds a controlled phase variation to the computed light distribution of the virtual scene such that speckle is reduced.
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Abstract
A near-to-eye display device includes a spatial light modulator. The spatial light modulator modulates an illumination wave to create a virtual-scene wave that is steered to a useful portion of an exit pupil plane. Higher diffraction orders and noise beams are filtered out by the user'"'"'s pupil acting as a spatial filter.
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Citations
26 Claims
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1. A head-worn display device comprising:
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a computer unit; at least one point light source mounted on the head-worn display device; and at least one spatial light modulator (SLM) mounted on the head-worn display device and operatively coupled to the computer unit; wherein light produced by the at least one point light source illuminates the SLM and gets modulated to produce modulated light, and the modulated light is directed on an exit pupil plane that includes a useful portion, wherein a light wave distribution within the useful portion is equal to a computed light distribution from a virtual scene, wherein the useful portion is steerable across the exit pupil plane to follow a motion of a user'"'"'s eye pupil relative to user'"'"'s eye when the head-worn display device is in use so that the user'"'"'s eye pupil acts as a spatial filter, and wherein the computer unit adds a controlled phase variation to the computed light distribution of the virtual scene such that speckle is reduced. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 21, 22, 23, 24)
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3. (canceled)
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16. A method comprising:
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determining a two-dimensional complex-valued profile of a virtual scene wave on a useful portion of an exit pupil plane; computing a back propagation of the two-dimensional complex-valued profile of the virtual scene wave on the useful portion of the exit pupil plane to a spatial light modulator plane to determine an ideal two-dimensional complex-valued wave profile at an exit of the spatial light modulator; determining a two-dimensional complex-valued profile of an illumination wave that will illuminate the spatial light modulator; assigning one of a plurality of controlled phase values to each of the plurality of virtual scene points to reduce speckle; extracting the two-dimensional complex-valued wave profile of the illumination wave from the ideal two-dimensional complex-valued wave profile at the exit of the spatial light modulator to obtain a two-dimensional ideal analog complex-valued spatial light modulator transmittance; applying prefiltering and sampling to the two-dimensional ideal analog complex-valued spatial light modulator transmittance to obtain a two-dimensional ideal complex-valued discrete spatial light modulator image; and encoding the two-dimensional ideal complex valued discrete spatial light modulator image into a two-dimensional actual digital spatial light modulator image that is suitable for displaying by the spatial light modulator, where noise introduced by the spatial light modulator is distributed to regions outside the useful portion. - View Dependent Claims (17, 19, 20, 25)
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18. (canceled)
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26. An apparatus comprising:
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a head-worn display device; means for determining a two-dimensional complex-valued profile of a virtual scene wave on a useful portion of an exit pupil plane; means for back-propagating the two-dimensional complex-valued profile of the virtual scene wave on the useful portion of the exit pupil plane to a spatial light modulator plane to determine an ideal two-dimensional complex-valued wave profile at an exit of the spatial light modulator free of paraxial or small-angle approximations whereby aberrations of the optical components in between are taken into account; means for determining a two-dimensional complex-valued profile of an illumination wave that will illuminate the spatial light modulator with aberrations of the optical components in between taken into account; means for assigning controlled phase values to each of the plurality of virtual scene points to reduce speckle; means for extracting the two-dimensional complex-valued wave profile of the illumination wave from the ideal two-dimensional complex-valued wave profile at the exit of the spatial light modulator to obtain a two-dimensional ideal analog complex-valued spatial light modulator transmittance; means for applying prefiltering and sampling to the two-dimensional ideal analog complex-valued spatial light modulator transmittance to obtain a two-dimensional ideal complex-valued discrete spatial light modulator image; and means for encoding the two-dimensional ideal complex-valued discrete spatial light modulator image into a two-dimensional actual digital spatial light modulator image that is suitable for displaying by the spatial light modulator, where noise introduced by the spatial light modulator is distributed to regions outside the useful portion.
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Specification