Patent ID: 7290921
Filing Date: 2007-11-06
Classification: G02B

Abstract:
1. A back light module, comprising: a light source; and a light guide member adjacent to said light source, and having a light incidence surface for receiving light from said light source and a light-emitting surface for emitting said light out of said light guide member and a bottom surface wherein the incidence surface is located between the bottom surface and the light-emitting surface, said light traveling in said light guide member along a predetermined path, a plurality of first scattering elements interferingly arranged in said path of said light for scattering said light before said light emits from said light-emitting surface, and a plurality of second scattering elements arranged in a neighborhood of selective ones of said plurality of first scattering elements to surround each of said selective ones of said plurality of first scattering elements along an imaginary ring region closely around said each of said selective ones of said plurality of first scattering elements for further scattering said light; wherein each of said plurality of second scattering elements is sided essentially smaller than each of said plurality of first scattering elements, and wherein said plurality of first and second scattering elements are shaped same as each other, and have a shape comprising one of a dot, a hemisphere, a sub-hemisphere, a pyramid, or any combination thereof.