Patent ID: 7312839

Claim:
A light guiding plate comprising: a light incident portion into which light is incident from a light source; a light reflecting pattern to reflect the light provided from the light incident portion; and a light transmitting surface to transmit the light reflected by the light reflecting pattern to a display panel, wherein the light reflecting pattern includes a plurality of light reflecting sections each of which has: a first light reflecting plane that is inclined with respect to the light transmitting surface to face toward the light source; and a second light reflecting plane that is inclined with respect to the light transmitting surface and connected with an edge of the first light reflecting plane so that the light reflection sections each form a prism shape, the light reflecting sections respectively having the second light reflecting planes that are configured to have different areal sizes to control reflectivity of the respective light reflecting sections, wherein the areal sizes of the second light reflecting planes are gradually increased by a selected amount such that the areal size of a second light reflecting plane is larger as the second light reflecting plane is remoter from the light incident portion, and wherein the first light reflecting planes of the light reflecting sections respectively have first angles with respect to the light transmitting surface, and the second light reflecting planes of the light reflecting sections respectively have second angles with respect to the light transmitting surface, the first angles having a substantially identical value and the second angles being gradually decreased by a selected amount such that the second angle of a second light reflecting plane is smaller as the second light reflecting plane is remoter from the light incident portion.