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Electrically addressable liquid crystal projection system with high efficiency and light output

  • US 5,115,305 A
  • Filed: 07/05/1990
  • Issued: 05/19/1992
  • Est. Priority Date: 07/05/1990
  • Status: Expired due to Fees
First Claim
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1. Color video projector apparatus, comprising a structural geometry oriented in a manner that describes nine positionally related component planes, including:

  • first, second, and third planes positioned substantially parallel to each other and with adjacent ones of those first, second, and third planes positioned approximately equidistant apart;

    fourth, fifth, and sixth planes positioned substantially parallel to each other and perpendicularly intersecting said first, second, and third planes, adjacent ones of said fourth, fifth, and sixth planes being positioned approximately the same distance apart as the distance between adjacent ones of said first, second, and third planes;

    a seventh plane positioned to intersect said first and second planes where said first and second planes intersect said fifth and sixth planes, respectively;

    an eighth plane positioned to intersect said first, second, and third planes where said first, second, and third planes intersect said fourth, fifth, and sixth planes, respectively; and

    a ninth plane positioned to intersect said second and third planes where said second and third planes intersect said fifth and sixth planes, respectively, such that said seventh, eighth, and ninth planes are parallel to each other and are oriented at substantially 45-degree angles to said first, second, and third planes as well as to said fourth, fifth, and sixth planes;

    first transmissive light valve means with an incident surface positioned in said third plane between said fourth and fifth planes for modulating a first color light beam being transmitted therethrough;

    second transmissive light valve means with an incident surface positioned in said fifth plane between said second and third planes for modulating a second color light beam being transmitted therethrough;

    third transmissive light valve means with an incident surface positioned in said second plane between said fifth and sixth planes for modulating a third color light beam being transmitted therethrough;

    first color light source means for creating said first color light beam and directing it to the incident surface of said first transmissive light valve means;

    second color light source means for creating said second color light beam and directing it to the incident surface of said second transmissive light valve means;

    third color light source means for creating said third color light beam and directing it to the incident surface of said third transmissive light valve means;

    first beam combining means positioned in said ninth plane between said second and third planes for combining said first color light beam emerging from said first transmissive light valve means with said second color light beam emerging from said second transmissive light valve means to create a combined first and second colors light beam directed between and substantially parallel to said fourth and fifth planes;

    second beam combining means positioned in said eighth plane between said fourth and fifth planes for combining said third color light beam emerging from said third transmissive light valve means with said combined first and second colors light beam to create a first, second, and third colors light beam; and

    first light redirecting means positioned in said seventh plane between said fifth and sixth planes for redirecting said third color light beam into said second beam combining means.

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