OPTICAL PLATE HAVING THREE LAYERS AND BACKLIGHT MODULE WITH SAME

摘要

An exemplary optical plate ( 20 ) includes a first transparent layer ( 21 ), a second transparent layer ( 23 ) and a light diffusion layer ( 22 ). The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. The first transparent layer includes a plurality of spherical protrusions ( 211 ) at an outer surface ( 210 ) thereof that is distalmost from the second transparent layer. The second transparent layer includes a plurality of depressions ( 231 ) at an outer surface ( 230 ) thereof that is distalmost from the first transparent layer. Each depression is shaped in the form of an inverted square pyramid. A direct type backlight module using the optical plate is also provided.