| 摘要 |
An optical film is provided for use in a light source or display to provide rapid cut-off of illumination with angle. The film comprises a light-transmissive substrate of a material having a reflective index greater than one and having first and second major surfaces. A surface relief is formed on at least one of the major surfaces and includes a mirror structure. The mirror structure comprises a groups of specularly reflective surfaces alternating in at least one direction with groups of transmissive surfaces. The film directs light passing therethrough into a desired angular output range, and light reflected back by the mirror structure is returned to a light source for recycling to enhance display brightness.
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