Patent ID: 6079840
Filing Date: 2000-06-27
Classification: G02B

Abstract:
A surface light source device of side light type, comprising:a light guide plate having an emitting surface as one major surface, and a lateral side;a primary light source to supply light to the light guide plate through the lateral side thereof so as to allow the light to be emitted from said emitting surface;at least one additional sheet arranged along said emitting surface, the sheet positioned furthest from said emitting surface defining an outermost additional sheet;a light-absorptive light shielding layer disposed between said emitting surface and the outermost additional sheet so as to subject the surface light source device of side light type to fringing; anda reflective layer disposed between said light-absorptive light shielding layer and said emitting surface so as to return light to said light guide plate and to prevent the light from being absorbed by said light-absorptive light shielding layer.