Inventors:
Xiang-Dong Mi - Northborough MA, US
Ju-Hyun Lee - Westborough MA, US
Assignee:
SKC Haas Display Films Co., Ltd. - Choongchungnamdo
International Classification:
F21V 7/04
US Classification:
362616, 362619, 362627, 362330
Abstract:
The present invention provides a light guide plate comprising an input surface for receiving light from a plurality of discrete light sources, an output surface for emitting light, and a bottom surface opposing to the output surface, wherein at least one of the output surface and the bottom surface has a micro-pattern, the micro-pattern consisting of a plurality of substantially identical micro-lenses, each micro-lens having a width, a length, and an orientation angle. The light guide plate further provides an area density D(x, y) of the micro-lenses varies in a first direction y-axis that is parallel to the length direction and in a second direction x-axis that is parallel to the width direction for y between starting line y and ending line, the area density D(x, y=y) at the starting line y varying between a minimal value Dmin and a maximum value Dmax such that Dmin≧1% and 100≧Dmax/Dmin≧2, and wherein the area density D(x,y) repeats in pitch P in the x-axis such that D(x,y)=D(x+P,y).