LIGHTING DEVICE AND PROJECTION DISPLAY DEVICE USING SAME

摘要

Disclosed is a lighting device comprising: a light source (10); a light guide plate (11) with an end surface to which light emitted from the light source (10) is fed; a quarter-wave plate (14) provided on the light guide plate (11); an HPDLC layer (12) provided on a surface of the light guide plate (11) which is the surface on the reverse side of the surface on which the quarter-wave plate (14) is provided; and a light guide plate (13) provided on a surface of the HPDLC layer (12) which is the surface on the reverse side of the surface on which the light guide plate (11) is provided. The HPDLC layer (12) has a periodic structure in which a liquid crystal layer having liquid crystal molecules oriented in one direction and a polymer layer are alternately layered, wherein the index of refraction of the polymer layer with respect to light which includes predetermined polarized light is different from that of the liquid crystal layer. Each interface between the polymer layer and the liquid crystal layer is oblique to a surface of the quarter-wave plate (14) and curved. An inner surface of each curved portion is positioned towards the light guide plate (11).