Optical film with improved optical properties, display apparatus comprising same, and manufacturing method therefor

An optical film comprising a polymer resin comprising a first repeating unit, a second repeating unit, a third repeating unit, and a fourth repeating unit,

• the optical film having an optical index, calculated using the following Formula 1, of 1.0%/GU or more:
• Optical
• ⁢
• Index
• =
• Parallel
• ⁢
• transmittance
• 20
• ⁢
• °
• ⁢
• Gloss
• -
• RSPEC
• [
• Equation
• ⁢
• 1
• ]
• wherein a parallel transmittance of the optical film is obtained by measuring a parallel transmittance of a sample film having a size of 50 mm×50 mm three times using a haze meter and calculating an average of three measurement values, and
• 20° gloss and RSPEC of the optical film are measured by placing white paper under one side of a sample film having a size of 30 mm×100 mm and performing measurement on a surface of the optical film using a gloss meter,
• wherein the first repeating unit is an imide repeating unit derived from a first diamine-based compound and a dianhydride-based compound,
• the second repeating unit is an imide repeating unit derived from a second diamine-based compound and the dianhydride-based compound,
• the third repeating unit is an amide repeating unit derived from the first diamine-based compound and a dicarbonyl-based compound, and
• the fourth repeating unit is an amide repeating unit derived from the second diamine-based compound and the dicarbonyl-based compound,
• wherein the first diamine-based compound is 2,2′-bis(trifluoromethyl)benzidine (TFDB) and the second diamine-based compound comprises an aromatic diamine-based compound, and
• a sum of numbers of the third and fourth repeating units is 80% or more of a total number of repeating units including the first to fourth repeating units.