A planar light source unit including a light guiding plate (1) having an anisotropic diffusing surface (1h) which emits anisotropic diffusion light, and a light emitting source (2) for supplying light to the light guiding plate, the anisotropic diffusing surface being formed into a shape configured to...http://www.google.co.uk/patents/US20060181903?utm_source=gb-gplus-sharePatent US20060181903 - Planar light source unit
