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LCD TV and projection-based backlight system used therefor

  • US 7,411,634 B2
  • Filed: 10/15/2007
  • Issued: 08/12/2008
  • Est. Priority Date: 03/31/2004
  • Status: Active Grant
First Claim
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1. A liquid crystal display (LCD) device, comprising:

  • a liquid crystal display (LCD) screen panel for producing images; and

    a projection-based backlight system comprisinga light source for supplying a light beam;

    polarizing means for polarizing the light beam supplied by the light source to obtain a polarized light beam; and

    a first projection lens for enlarging the polarized light beam received from the polarizing means and projecting the enlarged polarized light beam onto the LCD screen panel;

    wherein the polarizing means comprises;

    an integrating sphere having an entrance aperture and an exit aperture defined thereon, the integrating sphere configured to receive the light from the light source through the entrance aperture; and

    a reflective polarizer disposed adjacent to the exit aperture and configured to allow a specific polarization light pass therethrough for the first projection lens and to reflect other polarization lights back into the integrating sphere.

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