Patent ID: 7990490

Claim:
An optical sheet, comprising: a base layer including a first surface and a second surface facing the first surface; a light-condensing layer including a plurality of light-condensing portions with a first pitch, the light-condensing portions formed along a first direction of the second surface; and a plurality of light-reflecting portions formed on the first surface and spaced apart from each other along the first direction in correspondence with a plurality of grooves, each groove formed between two light-condensing portions, an interval distance between a center of the light-condensing portion and an edge of the light-reflecting portion increasing when moving toward an edge of the first surface from a center of the first surface along the first direction, wherein the light-condensing portions are extended along a second direction crossing the first direction with a positive acute angle to form a light-condensing stripe pattern, wherein the light-reflecting portions are extended along a third direction crossing the second direction with a negative acute angle to form a light-reflecting stripe pattern, and wherein each center of the light-reflecting portions substantially corresponds to each of the grooves which are formed by adjacent light-condensing portions at an edge.