Patent ID: 7661867

Claim:
A spread illuminating apparatus comprising: a light conductor plate having a light inlet surface and two major surfaces; a light source unit being disposed at the light inlet surface of the light conductor plate, the light source unit including plural kinds of white light sources that are arranged close to one another and that emit white lights having respective different light emission spectra; and a light diffuser pattern being disposed at least one of the two major surfaces of the light conductor plate, and being disposed at an area corresponding to the light source unit; wherein the light diffuser pattern is provided on at least one of the two major surfaces of the light conductor plate, the light diffuser pattern being located at an area close to the light inlet surface of the light conductor plate, and the light diffuser pattern includes a plurality of first regions that are located so as to face the light source unit in a light emitting direction of the light source unit and a plurality of second regions that are located between the first regions adjacently disposed, an area density occupied by the first regions being lower than an area density occupied by the second regions.