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Sequential projection color display using multiple imaging panels

  • US 20040184005A1
  • Filed: 01/08/2004
  • Published: 09/23/2004
  • Est. Priority Date: 07/12/2001
  • Status: Active Grant
First Claim
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1. A color projection display device for displaying a temporally-integrated color image comprising first and second sequences of temporally-integrateable primary color image components, the device comprising:

  • a first SLM panel comprising a first array of pixel elements;

    a second SLM panel comprising a second array of pixel elements;

    first driving circuitry which receives a first input signal representing said first sequence of temporally-integrateable primary color image components and selectively activates said first array of pixel elements to produce a first sequence of reflective patterns corresponding to said first sequence of temporally-integrateable primary color image components, each pattern in said first sequence of reflective patterns adapted to receive p-polarized incident light and to reflect corresponding s-polarized light;

    second driving circuitry which receives a second input signal representing said second sequence of temporally-integrateable primary color image components and selectively activates said second array of pixel elements to produce a second sequence of reflective patterns corresponding to said second sequence of temporally-integrateable primary color image components, each pattern in said second sequence of reflective patterns adapted to receive s-polarized incident light and-to reflect corresponding p-polarized light;

    an illumination unit which generates a non-polarized, substantially white, light beam;

    a first PBS which separates the non-polarized light beam into a substantially white p-polarized light beam and a substantially white s-polarized light beam;

    a first color switching mechanism which sequentially interposes each of a first set of primary color filter segments in the path of said substantially white p-polarized light beam to produce a sequence of p-polarized colored light beams whose colors correspond to the colors of said first sequence of temporally-integrateable primary color image components;

    a second PBS which transmits said sequence of p-polarized colored light beams onto said first SLM panel receives a sequence of patterned s-polarized colored light beams reflected from said first SLM panel, each patterned s-polarized colored light beam carrying one primary color image component in said first sequence of temporally-integrateable primary color image components, and deflects said sequence of patterned s-polarized colored light beams;

    a second color switching mechanism which sequentially interposes each of a second set of primary color filter segments in the path of said substantially white s-polarized light beam to produce a sequence of s-polarized colored light beams whose colors correspond to the colors of said second sequence of temporally-integrateable primary color image components;

    a third PBS which deflects said sequence of s-polarized colored light beams onto said second SLM panel, receives a sequence of patterned p-polarized colored light beams reflected from said second SLM panel, each patterned p-polarized colored light beam carrying one primary color image component in said second sequence of temporally-integrateable primary color image components, and transmits said sequence of patterned p-polarized colored light beams; and

    a fourth PBS which transmits the sequence of patterned p-polarized colored light beams transmitted by said third PBS and deflects the sequence of patterned s-polarized colored light beams deflected by said second PBS, thereby to produce a combined output beam carrying both said first sequence and said second sequence of temporally-integrateable primary color image components.

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