Patent ID: 7510314

Claim:
A backlight device comprising: a rectangular surface reflection sheet having front, backward, left side and right side directions along its surface and four corner portions; a plurality of side reflection sheets; a plurality of corner reflection sheets; a light source unit, mounted on the surface reflection sheet, comprising a plurality of light emitting diodes; a diverter plate located above the light source unit; and a diffusion sheet located above the diverter plate, wherein, the diverter plate reflects light rays orthogonal to its surface back to the rectangular surface reflection sheet, the diffusion plate reflects light received from the diverter plate to the side and corner reflection sheets, the side reflection sheets are positioned along respective edges of said rectangular surface reflection sheet and extend at an angle therefrom, adjacent side reflection sheets abutting along adjoining edges, the corner reflection sheets covering interior corners formed by the surface reflection sheet and the side reflection sheets at the corner portions of the surface reflection sheet, the side and corner reflection sheets reflect light emitted from the light source unit towards the front, backward, left side and right side surface directions, light emitting diodes of the light source unit are located at the corner portions of the surface reflection sheet, and each of the light emitting diodes located in the corner portions of the rectangular surface reflection sheet is equidistant from the two closest side reflection sheets and the corner reflection sheet forming the interior corner at said reflection surface corner portion.