Patent ID: 7311433
Filing Date: 2007-12-25
Classification: G01D,G02B

Abstract:
1. A backlight module for brightness enhancement of an LCD system comprising: a light guide providing light propagating paths being formed with a plurality of pattern structures, each of said pattern structures having a pair of diagonally-disposed first points defining a first length therebetween, and a pair of diagonally-disposed second points defining a second length therebetween, wherein said diagonally-disposed first points are disposed substantially along the light propagating path and said diagonally-disposed second points are disposed substantially to cross the light propagating path, wherein a ratio of said first length and said second length of one of said pattern structures adjacent to a light incident side of said light guide is substantially greater than a ratio of said first length and said second length of one of said pattern structures distant from said light incident side of said light guide.