Patent ID: 7682059

Claim:
A direct type back light comprising: a case; a plurality of lamps fixed inside said case, including at least two pairs of said lamps, wherein a first lamp of each pair of said lamps extends part away from proximate one side of said case toward an opposite side of said case and, after a gap, a second lamp of each pair of said lamps extends on toward the opposite side of said case; a reflecting plate arranged below said plurality of lamps; and a luminance control sheet located above said reflecting plate and below said plurality of lamps in an area of said gap, wherein said luminance control sheet has a reflective property which is different than a reflective property of said reflecting plate, wherein said luminance control sheet is separated from an adjacent luminance control sheet and is formed beneath each of curved portions of said lamps, wherein said at least one luminance control sheet has a width W and a length L to respectively fulfill the formulas of W=2x+2d and L=y where x is an outer curvature radius of a curve of a lamp of said plurality of lamps, y is a shortest distance between straight segments of said lamp, and d is a distance between curves of facing lamps, and wherein said at least one luminance control sheet is suspended from the lamp curve by a hanger.