Patent ID: 7255456
Filing Date: 2007-08-14
Classification: G02B,G02F

Abstract:
1. A direct backlight module, comprising: a frame; at least a light source, being arranged in the frame; a diffuser, being disposed over the frame; and at least an optical film, being disposed over both the diffuser and the at least a light source, further comprising a substrate having a top surface and a bottom surface; wherein a diffusion unit and a collimation unit are formed on the top surface while using the diffusion unit for diffusing light incident to the bottom surface and the collimation unit for collimating light incident to the bottom surface, wherein the diffusion unit further comprises at least a semi-lenticular lens, and the collimation unit further comprises at least a prism, wherein each semi-lenticular lens is characterized by a specific radius of curvature preferably in the range of 10 microns to 500 microns, and each prism is characterized by a vertex angle preferably in the range of 30° to 140° and a specific height, and wherein the specific height of each prism is varying along the axis of the same, and the specific radius of curvature of each semi-lenticular lens is varying along the axis of the same.