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Variable-depth stereoscopic display

  • US 10,082,669 B2
  • Filed: 02/19/2016
  • Issued: 09/25/2018
  • Est. Priority Date: 07/27/2011
  • Status: Active Grant
First Claim
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1. An optical system comprising:

  • a spatial light modulator configured to modulate diffuse light with frames of visual information to provide stereoscopic imagery to a viewer;

    a liquid crystal lens configured to focus the diffuse light to enable viewing of the stereoscopic imagery over different respective ranges of distance;

    a diffusion panel configured to provide the diffuse light by diffusing collimated light in a first direction and direct the diffuse light through the spatial light modulator;

    an optical wedge having a viewing surface configured to emit the collimated light into the diffusion panel and a thin end configured to receive light for collimation;

    two or more light source arrays individually selectable to inject the light for collimation into the thin end of the optical wedge, each of the two or more light source arrays being disposed at a different distance from the thin end of the optical wedge than others of the two or more light source arrays and configured to generate the light at different locations along the thin end of the optical wedge effective to scan, in a second direction that is substantially perpendicular to the first direction, the collimated light emitted by the optical wedge to direct different frames of the visual information to each eye of the viewer; and

    a controller configured to;

    determine a viewing distance at which the viewer is disposed relative the optical system; and

    manipulate, based on the viewing distance and the different respective ranges of distance over which the liquid crystal lens enables viewing of the stereoscopic imagery, the liquid crystal lens by applying an excitation voltage to the liquid crystal lens such that the stereoscopic imagery is visible to the viewer disposed at the determined viewing distance.

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