| 主权项 |
1. An optical film, comprising:
a first structured major surface comprising a plurality of linear prisms extending along a same first direction; and an opposing second structured major surface comprising a plurality of closely packed lenslets, each lenslet having a largest lateral dimension D, an equivalent circular diameter ECD and a finite focal length f corresponding to a focal spot, the plurality of closely packed lenslets having an average largest lateral dimension Davg, an average equivalent circular diameter ECDavg and an average focal length favg, ECDavg/favg being in a range from about 0.05 to about 0.20, Davg being less than about 50 micrometers, less than about 30% of the second structured major surface having a slope magnitude that is greater than about 5 degrees. |
