Diffuser film with controlled light collimation

(canceled)

A diffuser film with controlled light collimation comprising:

• a unitary layer wherein greater than or equal to 80 percent of a total mass of the unitary layer comprises a polycarbonate compound, the unitary layer having a first side and a second side opposite the first side and a first peripheral edge, the first side having a first textured surface comprising projecting portions and/or trough portions, wherein 20 to 50 percent of slope angles on the first textured surface proximate a first axis have a value of greater than zero to five degrees, the first axis being substantially parallel to the first peripheral edge, wherein the plastic layer controls collimation of light propagating therethrough;
• and wherein the projecting portions and/or the trough portions have an average width of 20 μm to 100 μm.

A method of controlling collimation in a diffusing film, comprising:

• determining a desired degree of collimation for the diffusing film;
• forming a plastic layer having a first side and a second side opposite the first side and a first peripheral edge, and
• texturing the first side to form a first textured surface comprising projecting portions and/or trough portions, wherein 20 to 50 percent of slope angles on the first textured surface proximate a first axis have a value of greater than zero to five degrees, wherein the projecting portions and/or the trough portions have an average width of 20 μm to 100 μm.