| 摘要 |
A prism sheet ( 42 ) includes a lower surface ( 422 ), an upper surface ( 424 ) opposite to the lower surface, and a refractive-diffractive hybrid lens array ( 426 ) formed on the upper surface. The refractive-diffractive hybrid lens array has a plurality of refractive-diffractive hybrid lenses ( 428 ). The refractive-diffractive hybrid lenses can reduce or even avoid chromatic aberration along axes thereof. This can converge light beams, thereby enhancing uniformity of the light beams. Thus, the prism sheet can provide satisfactory display quality. Furthermore, the refractive-diffractive hybrid lens array and the body of the prism sheet are in-mold by means of injection molding. This ensures relatively little process in the production line. Therefore, the prism sheet can be advantageously applied in backlight modules ( 5 ) of liquid crystal display devices.
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