| abstract |
[Configuration] In a direct type backlight unit having a light diffusion plate made of polycarbonate resin on the upper surface of a light source and a light reflection plate on the back surface of the light source, (1) The diffusivity D50 of the polycarbonate resin light diffusion plate is 30 ° or more, (2) the reflectance of the light reflection plate is 90% or more, and (3) the polycarbonate resin light diffusion plate. The luminance unevenness of the light emitting surface is 3% or less, This is a direct type backlight unit. The direct-type backlight unit of the present invention can reduce not only the lamp image on the light emitting surface but also local luminance unevenness due to minute foreign matter, and therefore a liquid crystal television having a high quality image. And can be suitably used for a direct backlight unit of a liquid crystal monitor. [Selection] Figure 1 |