| 摘要 |
A prism sheet for a backlight module includes a substrate, multiple parallel microstructure prisms and multiple elongated protrusions. The substrate has a first surface on which the parallel prisms are formed. Each of the prisms has a first facet, a second facet and an axis. The elongated protrusions are formed on at least one of the first and the second facets along the axis of each prism and may be shaped into curved or polygonal. Consequently, the elongated protrusions will provide increases of light refraction, refract the light into multiple directions and aid the entire prism sheet to efficiently distribute the refracted light to provide sufficient incident light transmitted into liquid crystal display panels.
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