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Projector with UV light source

  • US 6,769,773 B1
  • Filed: 05/20/2003
  • Issued: 08/03/2004
  • Est. Priority Date: 05/20/2003
  • Status: Active Grant
First Claim
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1. A picture projection system comprising:

  • a light source having at least one ultraviolet (UV) light emitting diode (LED)chip;

    a red fluorescent plate for emitting red light beam at the absorption of said UV light, a green fluorescent plate for emitting green light beam at the absorption of said UV light, and a blue fluorescent plate for emitting blue light beam at the absorption of said UV light;

    a programmable control means to control the amount of transmitted light from each one of said red light, said green light and said blue light;

    merging and focusing means to project the transmitted light onto a projection screen, wherein said control means is a programmable liquid crystal plate, and wherein one said UV LED chip each is placed behind cash said red fluorescent plate, said green fluorescent plate, and said blue fluorescent plate;

    a first prism to deflect said red light beam before a first said programmable control means, a second prism to defect said blue light beam before a second said programmable control means;

    a third said programmable control means the path of said green light beam;

    a first focusing lens system for focusing said red light beam from said first programmable control means onto said projection screen;

    a first focusing lens system for focusing said red fight beam from said first programmable control means onto said projection screen;

    a second focusing lens system for focusing said blue light beam from said second programmable control means onto said projection screen; and

    a third focusing lens system for focusing said green light beam from said third programmable control means onto to said projection screen.

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