| abstract |
The present invention provides an optical film having excellent visibility in a wide-angle direction and having sufficient mechanical properties even in a low-temperature environment, and a flexible display device having the same, comprising at least one selected from polyimide-based resins and polyamide-based resins, all of which are When the light transmittance is 85% or more, the haze is 0.5% or less, and the direction parallel to the machine advancing direction at the time of manufacture is the MD direction, and the direction perpendicular to the machine advancing direction is the TD direction, according to JIS K7374 The first transmission image value C 60 (MD) in the direction inclined by 60° from the vertical direction to the MD direction with respect to the film plane, obtained when the width of the optical comb is 0.125 mm, and the first transmission image value C 60 (MD) in the direction inclined by 60° from the vertical direction to the TD direction The second transmission image value C 60 (TD) in the direction and the third transmission image value C 0 in the vertical direction satisfy the formulas (1) to (3), and the breaking strain at -40°C of the optical film ε 1 and 25°C The fracture strain ε 2 satisfies the formula (4), 87%≤C 60 (MD)≤100% (1), 87%≤C 60 (TD)≤100% (2), 0.8≤C 60 (MD)/C 0 ≤1.0(3), 0.70≤ε 1 /ε 2 ≤1.20(4). |