A backlight unit is disposed beneath a display panel. The backlight unit includes an illumination means, which is used to provide a light source, and a diffuser positioned between the illumination means and the display panel, which is used to scatter the light generated by the illumination means. The...http://www.google.com.au/patents/US6861789?utm_source=gb-gplus-sharePatent US6861789 - Back light unit including a diffuser with various diffusion effects
