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Integration of a light collection light-guide with a field sequential color display

  • US 9,454,265 B2
  • Filed: 09/23/2013
  • Issued: 09/27/2016
  • Est. Priority Date: 09/23/2013
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an interactive field sequential color (FSC) display having a front surface including a viewing area, the FSC display including a display lighting system and an arrangement for spatial light modulation, the arrangement for spatial light modulation including an array of light modulators and apertures, each light modulator configured to be switched between an open position that permits transmittance of light from the display lighting system through a respective one of the apertures to the front surface and a shut position that blocks light transmission through the respective aperture;

    a transparent substrate, disposed between the display lighting system and the front surface and substantially parallel to the front surface, and having a periphery at least coextensive with the viewing area, the transparent substrate including a plurality of light turning elements selectively located in areas not directly above the apertures;

    at least one light sensor disposed outside the periphery of the transparent substrate; and

    a processor;

    wherein;

    the light modulators are switched in accordance with a first modulation scheme to render an image, the first modulation scheme adapted to utilize a persistence of vision phenomenon to render color images by sequentially alternating the color of visible light emitted by the display lighting system;

    the transparent substrate is configured to pass light emitted by the display lighting system toward the front surface and to receive light reflected through the front surface from an object, the transparent substrate including a first light-turning arrangement that redirects a portion of the received light toward the at least one light sensor;

    the light sensor is configured to output, to the processor, a signal representative of a characteristic of the received, redirected light; and

    the processor is configured to;

    switch the light modulators in accordance with a second modulation scheme to selectively pass object illuminating light from the display lighting system through at least one of the respective apertures, the object illuminating light being at least partially unrelated to the image; and

    recognize, from the output of the light sensor, a characteristic of the object.

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