LIGHT DIFFUSING PLATE OF DIRECT LIGHTING BACK LIGHT UNIT

摘要

PURPOSE: A light diffusion plate of a front illumination type backlight device is provided to improve an optical property and include a simple structure. CONSTITUTION: An optical pattern is continuously formed on a back side layer(210) in the arrangement direction of a light source. The optical pattern is formed by rounding vertexes. A middle layer(220) fills the ridge and valley of the optical pattern on the back side layer. The optical pattern of the middle layer is continuously formed on an upper layer(230) in the arrangement direction of the light source.