Patent ID: 9310619
Filing Date: 2016-04-12
CPC Classification: G02B,G02F

Claim Text:
1. An optical film comprising, in sequence from a light entry side of the optical film to a light emission side of the optical film: a plurality of first prisms; a first phase-difference plate; and a polarized-light separating element, wherein the plurality of first prisms each having (i) a first surface through which light enters the first prism and (ii) a second surface that reflects the light, having entered the first prism through the first surface, toward the light emission side; the optical film further comprising, between the plurality of first prisms in an in-plane direction of the optical film, a light reflecting section that reflects light, having been reflected by the polarized-light separating element toward the light entry side, back toward the light emission side; the first phase-difference plate is a ¼ wavelength plate; the light reflecting section is a second prism having a third surface and a fourth surface each of which reflects light; an angle between the third surface and the fourth surface is larger than an angle between the first surface and the second surface; and the optical film further comprises a second phase-difference plate between the ¼ wavelength plate and the second prism.