Patent ID: 6164790
Filing Date: 2000-12-26
Classification: G02B

Abstract:
A back light unit for a liquid crystal display device comprising:a light guide having a first surface, said first surface including a plurality of defined areas and a first geometrical pattern of uniform shape configuration on said plurality of defined areas, said geometrical pattern including geometrical shaped elements, said geometrical shaped elements being continuous along one dimension of said light guide, wherein each of said defined areas includes a plurality of pitches that are substantially the same between each geometrical shaped elements, and said plurality of defined areas including a first defined area, a second defined area, said second defined area located further away than a location of said first defined area relative to a substantially central portion on said first surface, and a pitch between said geometrical shaped elements in said first defined area is different from a pitch between said geometrical shaped elements in said second defined area; anda lamp attached to at least one side of the light guide.