| 摘要 |
A backlight unit for a liquid crystal display device is provided to increase the transmissibility in a prism light guide plate by forming a coating layer at a lower surface of the prism light guide plate. A backlight unit for a liquid crystal display device includes a lamp(121), a prism light guide plate(122), a coating layer, and a plurality of optical sheets(124). The lamp generates light. The prism light guide plate is disposed in a side portion of the lamp. A plurality of dot patterns is formed on a lower surface of the prism light guide plate. The coating layer is formed of material having high optical transmittance, and is coated on a lower surface of the prism light guide plate along the dot patterns. The optical sheets diffuse and collect the light from the prism light guide plate, and provide it to a front direction. The coating layer is formed to have a thickness ranging from 100 mum to 500 mum. |
