| 摘要 |
An optical sheet is adapted for diffusing and converging light, and includes a light-transmissive base layer, a prism layer, and a plurality of diffusion regions. The base layer has a first surface and a second surface that is opposite to the first surface. The prism layer is provided on the first surface of the base layer and has a plurality of prisms, each of which has a peak and two inclined surfaces that meet at the peak. At least two of the peaks of the prisms are different in height. The diffusion regions are disposed on the inclined surfaces of the prisms. Each of the diffusion regions is in the form of a roughened surface.
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