Patent ID: 7350957

Claim:
A light guide plate having a block body, comprising: a light incident surface; a first light emitting surface and a second light emitting surface, the first and second light emitting surfaces being at opposite sides of the block body, the first and second light emitting surfaces adjoining the light incident surface; a plurality of first tapered projections provided on the light incident surface adjacent to the first light emitting surface, wherein a width of each first tapered projection relative to the light incident surface along a direction perpendicular to the light incident surface progressively decreases away from the first light emitting surface; and a plurality of second tapered projections provided on the light incident surface adjacent to the second light emitting surface, the second tapered projections being tapered in an opposite direction relative to the first tapered projections wherein a width of each second tapered projection relative to the light incident surface along a direction perpendicular to the light incident surface progressively decreases away from the second light emitting surface.