| 摘要 |
PURPOSE: A prism sheet for a back light unit is provided to increase the condensing efficiency of light by forming minute holes at a prism sheet for condensing reflected or refracted light, thereby forming a one-prism back light. CONSTITUTION: A prism sheet(110) increases the condensing efficiency of light in a back light unit. A basic layer(110a) is provided. A prism layer(110b) is placed on the basic layer, and of which a top side is formed of a prism plane. A plurality of holes(112) are formed on the basic layer and the prism layer at the corresponding positions. A diameter of the hole is larger than wavelength of light several tens times. A gap between the holes is smaller than one prism pattern, and larger than the wavelength of light. |
