An improved backlight assembly comprising an array of apertures in close proximity to a light source, an array of tapered optical elements that have a light input surface area smaller than the light output surface area. Light rays pass through the apertures and are directed to the optical elements which...http://www.google.de/patents/US5598281?utm_source=gb-gplus-sharePatent US5598281 - Backlight assembly for improved illumination employing tapered optical elements
