Samsung patents polymer compound to extend OLED screen lifespan

1. A polymer compound including a Structural Unit (A) represented by Chemical Formula (1): wherein, in Chemical Formula (1), R 11 to R 14 and R 21 to R 24 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted cycloalkoxy group, a substituted or unsubstituted aryl group, or a halogen atom, wherein R 11 and R 21 are optionally linked to each other to form a ring, L 1 is a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 ring-member atoms, or a substituted or unsubstituted aromatic heterocyclic group having 5 to 25 ring-member atoms, Ar 1 is a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 ring-member atoms, Ar 2 is a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 ring-member atoms, or a substituted or unsubstituted aromatic heterocyclic group having 5 to 25 ring-member atoms, or is linked to Ar 1 to form a ring, X 1 is a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 ring-member atoms, Y 1 is a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 ring-member atoms, and at least one of X 1 and Y 1 is an aromatic hydrocarbon group having 6 to 25 ring-member atoms substituted with an alkyl group having 1 to 14 carbon atoms substituted with a carboxyl group or an alkyl group having 1 to 14 carbon atoms substituted with a group having a carboxyl group.