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Flat panel light source device and passive display device utilizing the light source device

  • US 5,913,594 A
  • Filed: 02/25/1997
  • Issued: 06/22/1999
  • Est. Priority Date: 02/25/1997
  • Status: Expired due to Fees
First Claim
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1. Flat panel light source device comprising:

  • (a) First and second light transmission panels, with relatively high refractive index and relatively high light transmission characteristics, being located adjacently in parallel, said first light transmission panel being for use for illumination and said second light transmission panel being for use a bypass light guide; and

    (b) light coupling means, making light coupling between said first and second light transmission panels, said light coupling means being located near one pair of side terminals of said both light transmission panels distant from another pair of side terminals of said both light transmission panels, incident light rays being input into said another pair of side terminals, wherein said light coupling means is an optical prism.

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