Polyimide-based solution and polyimide-based film produced using same

A display substrate comprising a polyimide-based film obtained from a solvent having a positive partition coefficient (Log P) at 25° C. and a polyamic acid having a structure of Formula 2:

• wherein X is a tetravalent organic group derived from an acid dianhydride and Y is divalent organic group derived from a diamine;
• wherein a coating of the polyimide-based solution on a substrate has a haze of 1% or less after storage at a temperature of 30° C. and a humidity of 70% for 30 minutes;
• and
• wherein the diamine is at least one selected from the group consisting of 4,4′-diaminodiphenyl ether, 4,4′-diaminodiphenylsulfide, 4,4′-diaminodiphenylsulfone, 4,4′-diaminobenzophenone, bis[4-(4-aminophenoxy)phenyl]methane, 2,2-bis[4-(4-aminophenoxy)phenyl]propane, 2,2-bis[4-(4-aminophenoxy)phenyl]-1,1,1,3,3,3-hexafluoropropane, 1,3-bis(4-aminophenoxy)benzene, 4,4′-bis(4-aminophenoxy)biphenyl, bis[4-(4-aminophenoxy)phenyl]ketone, bis[4-(4-aminophenoxy)phenyl]sulfoxide, bis[4-(4-aminophenoxy)phenyl]sulfone, bis[4-(4-aminophenoxy)phenyl]ether, 4,4′-bis(4-aminophenylsulfonyl)diphenyl ether, 4,4′-bis(4-aminothiophenoxy)diphenylsulfone, 1,4-bis[4-(4-aminophenoxy)benzoyl]benzene, 3,3′-diaminodiphenyl ether, 3,3-diaminodiphenylsulfide, 3,3′-diaminodiphenylsulfone, 3,3′-diaminobenzophenone, bis[4-(3-aminophenoxy)-phenyl]methane, 2,2-bis[4-(3-aminophenoxy)phenyl]propane, 2,2-bis[4-(3-aminophenoxy)phenyl-1,1,1,3,3,3-hexafluoropropane, 1,3-bis(3-aminophenoxy)benzene, 4,4′-bis(3-aminophenoxy)biphenyl, bis[4-(3-aminophenoxy)phenyl]ketone, bis[4-(3-aminophenoxy)phenyl]sulfide, bis[4-(3-aminophenoxy)phenyl]sulfone, bis[4-(3-aminophenoxy)phenyl]ether, 4,4′-bis(3-aminophenylsulfonyl)diphenyl ether, 4,4′-bis(3-aminothiophenoxy)diphenylsulfone, 1,4-bis[4-(3-aminophenoxy)benzoyl]benzene, 2,2′-bis(trifluoromethyl)benzidine, 2,2-bis[4-(-aminophenoxy)phenyl]hexafluoropropane, para-phenylene diamine, meta-phenylene diamine, and 4,4′-(9-fluorenylene)dianiline,
• wherein Y in the polyamic acid comprises both a divalent organic group having a fluorine atom-containing substituent and a divalent organic group having no fluorine atom-containing substituent, and
• wherein the molar ratio of the divalent organic group having a fluorine atom-containing substituent to all divalent organic groups in Y is from 0.1:1 to 0.9:1.