The liquid crystal display device has red, green, and blue LEDs, each emitting a different color light, as a light source. An acrylic lens is mounted on the emission surface of the LED to change angular distributions of light from the LED. The shape of the acrylic lens varies depending on the color of...http://www.google.se/patents/US6976779?utm_source=gb-gplus-sharePatent US6976779 - Planar light source device and liquid crystal display device using the same
