Polyimide film and method for producing same

A polyimide film, which has a yellow index of 3 or less, a haze of 1% or less, a transmittance of 88% or more, a modulus of 5.0 GPa or more, and a surface hardness of HB or higher, and which comprises a first surface having a surface roughness of 0.1 nm to 150 nm and a second surface opposite to the first surface and having a surface roughness of 0.1 nm to 40 nm,

• wherein when the first surface is divided into 1 cm×1 cm, the area falling under a defect free region is 90% or more, the defect free region referring to a region that satisfies the conditions that the numbers of a first protrusion, a second protrusion, a third protrusion, and a fourth protrusion, which have a width of 0.3 μm to 3 μm, a height of 0.5 μm to 5 μm, and a length of 2 μm to less than 3 μm, 3 μm to less than 5 μm, 5 μm to less than 10 μm, and 10 μm or more, respectively, are 10 or less, 5 or less, 3 or less, and 0, respectively, in the divided area of 1 cm×1 cm, and
• wherein the polyimide film is prepared from a polyamide-imide polymer formed by polymerizing an aromatic diamine compound, an aromatic dianhydride compound, and a dicarbonyl compound, wherein the aromatic diamine compound comprises 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl (TFDB), the aromatic dianhydride compound comprises 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6-FDA), and the dicarbonyl compound comprises terephthaloyl chloride (TPC), 1,1′-biphenyl-4,4′-dicarbonyl dichloride (BPDC), or a combination thereof.