Patent ID: 6454452
Filing Date: 2002-09-24
Classification: G02B,G02F

Abstract:
A backlight for a liquid crystal display device, comprising:a rod-shaped light source supplying light for displaying information on a liquid crystal panel; and a light guide plate having a receiving end surface parallel to and adjacent said rod-shaped light source, receiving light from said rod-shaped light source, an output surface located opposite and parallel to a liquid crystal panel, and a bottom surface facing and parallel to said output surface wherein said bottom surface includes a plurality of recesses, each recess having, in a cross-section transverse to said end surface, a triangular shape and including a reflecting surface facing and oblique to said receiving end surface, and a depth extending from said bottom surface into said light guide plate, the recesses being spaced apart and arranged in rows transverse to said receiving end surface, the rows of recesses being separated by planar strip portions of said bottom surface, wherein respective depths of the recesses in each row increase with increasing distance from said receiving end surface and respective widths of said planar strip portions decrease with increasing distance from said receiving end surface.