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Image display unit and method of detecting object

  • US 20090033638A1
  • Filed: 09/30/2008
  • Published: 02/05/2009
  • Est. Priority Date: 04/19/2005
  • Status: Active Grant
First Claim
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1. An image display unit comprising:

  • a first light source emitting light in a visible wavelength range;

    a second light source emitting light in an invisible wavelength range;

    a plurality of liquid crystal devices arranged in a screen, the plurality of liquid crystal devices modulating light in a visible wavelength range from the first light source on the basis of image data and allowing light in an invisible wavelength range from the second light sources to pass through;

    a plurality of light-receiving devices arranged in the screen, and receiving light in an invisible wavelength range;

    a display driving means for driving the plurality of liquid crystal devices on the basis of the image data so that light in a visible wavelength range is emitted from the screen as display light;

    a light reception driving means for driving the plurality of light-receiving devices so as to detect, on the screen, light in an invisible wavelength range emitted from the screen and reflected from a target object as detection light; and

    a detecting means for detecting the target object on the basis of light reception signals obtained from the light-receiving devices,wherein the liquid crystal devices each include;

    a pair of transparent substrates facing each other,a liquid crystal layer disposed between the pair of transparent substrates, anda transmission filter allowing light in a predetermined wavelength range from light in a visible wavelength range and light in an invisible wavelength range having passed through the liquid crystal layer to pass through.

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