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Backlighting system with a multi-reflection light injection system and using microprisms

  • US 5,359,691 A
  • Filed: 04/19/1993
  • Issued: 10/25/1994
  • Est. Priority Date: 10/08/1992
  • Status: Expired due to Term
First Claim
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1. An assembly for backlighting a liquid crystal display, comprising:

  • (a) a backlighting light pipe having opposing top and bottom surfaces which define the thickness of the light pipe, opposing sides which define its width, and opposite ends which define its length;

    (b) means for directing light into said light pipe and for causing it to move therethrough; and

    (c) an arrangement of immediately adjacent pyramid microprisms in rows extending normal to the lengthwise axis of the light pipe from one side of said light pipe to its opposing side along the entire extent of and serving as the bottom surface of the light pipe, each of said pyramid microprisms having its vertex extending downward from a rectangular base so as to define from said vertex first and second pairs of opposing, upwardly angled light reflecting surface segments for reflecting light within said light pipe upwards through its top surface in a generally collimated manner.

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