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Using same optics to image, illuminate, and project

  • US 7,525,538 B2
  • Filed: 06/28/2005
  • Issued: 04/28/2009
  • Est. Priority Date: 06/28/2005
  • Status: Active Grant
First Claim
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1. A system for directing light in an interactive display system, the interactive display system including a generally transparent planar panel having a first surface on which visible images are projected and a second surface opposite the first surface, proximate to which a user interaction with an object occurs to provide an input to the interactive display system, comprising:

  • (a) a lensing device operable to focus a predominantly visible light output to project an image over the first surface and at least one of;

    (i) distribute a predominantly non-visible light output over the first surface; and

    (ii) focus non-visible light reflected from an object adjacent to the second surface, to a focal input of a light sensor;

    (b) a light separating system operable to separate at least one of;

    (i) an input light so that the input light are separated into a predominantly visible light input and a predominantly non-visible light input, the predominantly visible light input being selectively modulated by a modulating system to produce a predominantly visible light output directed to the lensing device, at least a portion of the predominantly non-visible light input being directed to the lensing device as a predominantly non-visible light output; and

    (ii) predominantly non-visible received light reflected from the object, from received light, such that substantially only the predominantly non-visible light reflected from the object adjacent to the second surface is routed to the light sensor; and

    (c) at least one polarizing device disposed to cause only a substantially polarized component of the predominantly non-visible light output to be transmitted through the lensing device while passing at least a portion of the predominantly non-visible light that is reflected from the object and polarized but not in a same plane as the substantially polarized component of the substantially non-visible light output.

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