| CPC G02B 6/0036 (2013.01) [G02F 1/133615 (2013.01)] | 4 Claims |
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1. A light guide plate having a thickness, the light guide plate comprising:
a light entrance surface that is parallel to a direction of the thickness of the light guide plate and through which light enters;
a light exit surface that is perpendicular to the direction of the thickness and from which the light is emitted; and
a facing surface that faces the light entrance surface,
wherein the light having entered through the light entrance surface is guided toward the facing surface, and is emitted from the light exit surface,
wherein the light guide plate has (i) a refractive index Nx of the light guide plate in an orientation perpendicular to the light entrance surface and perpendicular to the thickness, and (ii) a refractive index Ny of the light guide plate in an orientation parallel to the light exit surface and parallel to the light entrance surface,
wherein the refractive index Nx is higher than the refractive index Ny,
wherein the thickness of the light guide plate is 0.1 mm to 1.0 mm, and
wherein a difference (Nx−Ny) between the refractive index Nx and the refractive index Ny of the light guide plate is 0.002 or more.
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