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Illumination device

  • US 4,737,896 A
  • Filed: 07/21/1986
  • Issued: 04/12/1988
  • Est. Priority Date: 07/23/1985
  • Status: Expired due to Term
First Claim
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1. An illumination device comprising:

  • a. a light source;

    b. a display panel having picture elements arranged in rows and columns, each of the picture elements being independently controlled to be either in an open state or in a closed state;

    c. A first light-deflecting means for converting the rays emitted from the light source into parallel rays; and

    d. a second light-deflecting means having a reflection plane for directing the parallel rays to the display panel, the reflection plane being formed by a prism array, and the pitch between the prisms in the prism array being smaller than the pitch between the image elements in the display panel.

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