LIGHT DIFFUSION PLATE AND DIRECT BACKLIGHT DEVICE

摘要

Disclosed are a light diffusion plate improved in luminance and luminance uniformity, and a direct backlight device. Specifically disclosed is a light diffusion plate for diffusing the light from a light source, which comprises a light incident surface through which the light from the light source enters and a light emitting surface through which the incident light is diffused and emitted. This light diffusion plate is characterized in that the light incident surface is a generally flat surface while the light emitting surface has a prism array having a plurality of linear prisms of a specific shape having a projected or recessed cross section. Also specifically disclosed is a direct backlight device characterized by comprising such a light diffusion plate.