| 摘要 |
A light control sheet suitable for direction-controlling an angularly extending oblique input light, surface light source device and LCD using the light control sheet. A light control sheet is disposed along an emission face of a light guide plate direction-controls main and subsidiary light fluxes to cause them to be emitted toward a desired direction. Main beam S1 emitted from the emission face transmits (with a small refraction) through a first face, being inner-reflected (total reflection) by a first slope region and then outputted from a light output face (SS1). First subsidiary beam T1 transmits (with a small refraction) through the first face, being inner-reflected (total reflection) by a second slope region and then outputted from the light output face (TT1).
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