Patent ID: 9377575
Filing Date: 2016-06-28
CPC Classification: G02B

Claim Text:
1. A light guide plate emitting light radiated from a light source disposed at a side thereof through a light emission side, the light guide plate comprising: a light guide layer having a light incidence side for introducing light emitted from the light source into the light guide layer; a polarization separation layer comprising a first matrix layer having an isotropic refractive index of nm1 and a first fiber having birefringence, with an ordinary ray refractive index, no1 and an extraordinary ray refractive index, ne1; where the extraordinary ray refractive index is measured parallel to the length direction of the fiber and the ordinary ray refractive index is measured perpendicular to the length direction of the fiber; where the polarization separation layer are disposed in the light guide plate closer to the light emission side than the light guide layer; where the first fiber is continuous from one face of the polarization separation layer to an opposing face of the polarization separation layer; a low refractive index layer having a lower refractive index than the refractive index of the first matrix layer and disposed more toward the light emission side than the polarization separation layer; and an angle improvement layer comprising a second matrix layer having an isotropic refractive index of nm2 and a second fiber disposed inside the second matrix layer and having birefringence, with an ordinary ray refractive index, no2, an extraordinary ray refractive index ne2, where the extraordinary ray refractive index is measured parallel to the length direction of the fiber and the ordinary ray refractive index is measured perpendicular to the length direction of the fiber; and where the angle improvement layer is disposed more toward the light emission side than the low refractive index layer, and wherein the first matrix layer and second matrix layer comprise a resin having the same composition, and the first fiber and the second fiber comprise a resin having the same composition; wherein the first matrix layer, the second matrix layer, the first fiber, and the second fiber have a refractive index in a range of |nm1-no1|≦0.01 and |nm2-no2|1≦0.01, or |nm1-ne1|≦0.01 and |nm2-ne2|≦0.01.