Patent ID: 6801184
Filing Date: 2004-10-05
Classification: G02B

Abstract:
A backlight device, including:a transparent substrate; a plurality of protrusions provided on the substrate; a first layer of transparent material attached to the substrate, the first layer of transparent material having an index of refraction smaller than the substrate; a second layer of transparent material attached to the first layer of transparent material, the second layer of transparent material having particles inside; and a light source to emit the light, a part of which is scattered by the plurality of protrusions, propagates through the substrate, the first layer of material and the second layer of material, is further scattered by the particles inside the second layer of material, and propagates out from the backlight device, and the rest of which is totally reflected at the second surface of the substrate, is scattered by the plurality of protrusions, propagates through the substrate, the first layer of material and the second layer of material, is further scattered by the particles inside the second layer at material, and propagates out from the backlight device.