Patent ID: 7046907

Claim:
A backlight system comprising: a light-guiding plate having an upper surface, a lower surface and a light-entrance surface; a light emitting source disposed to face the light-entrance surface of the light-guiding plate; and a prismatic sheet disposed at a position facing the upper surface of the light-guiding plate and having a final exit surface for light disposed to face an object to be irradiated, wherein light emitted from the light emitting source enters the light-guiding plate, and the light is adapted so as to change the path thereof in the light-guiding plate, and then the light is emitted from the upper surface of the light-guiding plate and enters the prismatic sheet, and the light is adapted so as to adjust the direction thereof in the prismatic sheet to irradiate illumination light emitted from the final exit surface of the prismatic sheet to the object, and wherein the prismatic sheet includes a plurality of prisms on a surface of the prismatic sheet that faces the light-guiding plate and a plurality of lenticular elements on the final exit surface and the prisms and lenticular elements are dimensioned and arranged such that each prism is associated with, and directs light to, more than one lenticular element.