Patent ID: 8608331

Claim:
A backlight module comprising: a first optical film having high light reflection characteristics; a second optical film spaced apart from said first optical film, and having polarization light selection transmission characteristics and light reflection characteristics; a plurality of lampshades having high light reflection characteristics, disposed between said first optical film and said second optical film, extending in an axial direction, and arranged so that any two spaced-apart adjacent ones of said lampshades cooperate with said first and second optical films to define a light mixing chamber thereamong, thereby forming a plurality of said light mixing chambers between said first and second optical films; and a plurality of line light sources each disposed in a corresponding one of said light mixing chambers, extending in the axial direction and mounted to a corresponding one of said lampshades for emitting light; wherein light emitted by each of said line light sources is mixed in the corresponding one of said light mixing chambers through reflection by two corresponding spaced-apart ones of said lampshades defining the corresponding one of said light mixing chambers such that light transmitted out from the corresponding one of said light mixing chambers through said second optical film forms a surface light field.