| 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 and the first and second transparent layers are integrally formed, with each of the first transparent and second transparent layers in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin ( 221 ), and diffusion particles ( 222 ) dispersed in the transparent matrix resin. The first transparent layer includes spherical depressions ( 211 ) at an outer surface ( 210 ) thereof that is farthest from the second transparent layer. The second transparent layer includes protrusions ( 231 ) at an outer surface ( 230 ) thereof that is farthest from the first transparent layer. Each protrusion is shaped in the form of a square pyramid. An exemplary direct type backlight module ( 200 ) using the optical plate is also provided.
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