A backlight device that includes a transparent substrate, a plurality of protrusions, a first layer of transparent material, a second layer of transparent material and a light source. The protrusions are provided on the substrate. The first layer of transparent material is attached to the substrate. Also, the first layer of transparent material has an index of refraction smaller than the substrate. The second layer of transparent material is attached to the first layer of transparent material, while the second layer of transparent material has particles inside. The light source emits light. The light is scattered by the protrusions, propagates through the substrate and the first layer of material, propagates into the second layer of material, is scattered by the particles of the second layer of material, and then propagates out from the backlight device.
CROSS-REFERENCE TO RELATED APPLICATIONS
This patent application is a divisional application of U.S. Ser. No. 09/793,460, filed on Feb. 26, 2001 now U.S. Pat. No. 6,801,184, which claims priority to Taiwanese Application No. 89113372 , filed on Jul. 6, 2000.
