DIFFUSION PLATE HAVING MICROSTRUCTURES WITH TWO LENGTHY AND SLANT FACES APPLIED FOR BACKLIGHT MODULE AND OPTICAL DEVICE

摘要

A diffusion plate having microstructures with two lengthy and slant faces and its relevant backlight module as well as optical device includes an optical base and a diffusion plate with pluralities of microstructures; wherein, the microstructures on the optical base are located by different allocation, and an angle is defined by the cooperation of two longitude and slant faces of each microstructure. The above arrangements substantially impinge on controlling the light return and transmission of the backlight module or the optical device including a brightness enhancement film, a light source, and a reflecting plate disposed thereon, thereby increasing the uniformity of backlight through the optical reflection and refraction.