| abstract |
The present invention provides a surface light emitter having excellent optical characteristics, particularly light extraction efficiency, and various physical characteristics, in particular, adhesion, impact resistance, low curling properties, scratch resistance, antifouling properties, flame retardancy, and antistatic properties. Provided is an optical film having excellent properties and weather resistance. A plurality of convex microlenses are arranged, and the microlens has a region α and a region β, and the region β occupies a convex outer portion of the microlens and covers the region α. An optical film having an average curl value at four corners when the 50 mm square optical film is dried at 60 ° C. for 4 hours is selected. [Selection figure] None |