Patent ID: 8613986

Claim:
An optical film comprising: an aromatic-based unit including 5 to 10,000 of units represented by Formula 6; a (meth)acrylate-based unit which is a copolymer of a (meth)acrylate derivative and maleimide; and a styrene-based unit which is a copolymer of a styrene derivative and maleimide: wherein a content of the copolymer of the (meth)acrylate derivative and maleimide is in a range of about 50% to about 99% on the basis of a weight of resin, a content of the aromatic-based unit is in a range of about 0.5% to about 40% on the basis of the weight of resin, and a content of the copolymer of the styrene derivative and maleimide is in a range of about 0.5% to about 30% on the basis of the weight of resin, and wherein in the optical film, regardless of stretching, an absolute value of photoelasticity coefficient is 3×10 −12 m 2 /N or less.