To provide a light diffusion film which can stabilize a display grade for a long period by protecting components from UV rays from a light source of a surface light source device.
The light diffusion film 7 can be composed of a light diffusion layer 8 comprising a plurality of resins varying in refractive indices and a transparent resin layer 9 laminated on the layer 8 and at least the transparent resin layer contains a UV absorbent. The layer 8 can be composed of a continuous phase 8a and a dispersion phase 8b and may anisotropically scatter the light. The UV absorptive light diffusion film is applicable to a transmission type display device comprising a liquid crystal display unit and a surface light source unit. The surface light source unit is provided with a tubular light source, light transmission member, light diffusion film, and prism sheet. The light diffusion film absorbs the UV rays from the light source (fluorescent tube) of the surface light source (backlight), thereby preventing the deterioration of the prism sheet and the liquid crystal display cell.
ONISHI MASAYA
SASAGAWA TOMOHIRO
IWASAKI NAOKO
YUKI AKIMASA
MURAKAMI OSAMU
MITSUBISHI ELECTRIC CORP