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Surface-emitting device, front light, and liquid crystal device

  • US 6,474,824 B1
  • Filed: 08/23/2000
  • Issued: 11/05/2002
  • Est. Priority Date: 12/28/1998
  • Status: Expired due to Term
First Claim
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1. A surface-emitting device, comprising:

  • a transmissive light guide plate that emits from its surface light propagating therein in a first direction along its plate plane, the front surface of said light guide plate comprising a convex portion or a concave portion having an inclined face that emits light from the front surface;

    a light source placed adjacent to a first end of said light guide plate that introduces light into said light guide plate in a second direction different from the first direction; and

    a reflecting layer, disposed at a second end of said light guide plate different from the first end where said light source is placed, that reflects light which propagates inside said light guide plate in the second direction in nearly the first direction, inside said light guide plate, said convex portion or said concave portion of said front surface of said light guide plate comprising a gently inclined face formed to face the second direction, as viewed from the inside of said light guide plate, and inclined at a small angle to the rear face of said light guide plate, and a steeply inclined face formed to face the first direction, as viewed from the inside of said light guide plate, and inclined at a large angle to the rear face of said light guide plate.

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