Photosensitive resin composition, black pixel defining layer using the same and display device

A photosensitive resin composition for a black pixel defining layer, comprising:

• about 1 wt % to about 15 wt % of a binder resin, the binder resin including a polyamic acid-polyimide copolymer that includes a polyamic acid repeating unit and a polyimide repeating unit in a mole ratio of the polyamic acid repeating unit to the polyimide repeating unit of about 5:5 to about 9:1;
• about 1 wt % to about 15 wt % of a photopolymerizable monomer;
• about 0.1 wt % to about 5 wt % of a photopolymerization initiator, the photopolymerization initiator including a first photopolymerization initiator and a second photopolymerization initiator;
• about 1 wt % to about 15 wt % of a black colorant;
• and
• about 50 wt % to about 90 wt % of a solvent,
• wherein:
• all wt % are based on a total weight of the photosensitive resin composition for a black pixel defining layer,
• the first photopolymerization initiator is represented by Chemical Formula 1,
• the second photopolymerization initiator is represented by one of Chemical Formula 2, Chemical Formula 3, Chemical Formula 4, or Chemical Formula 6, and
• the first photopolymerization initiator and the second photopolymerization initiator are included in a weight ratio of about 3:7 to about 7:3,
• wherein, in Chemical Formula 1,
• R1 and R2 are each independently a hydrogen atom, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, or a substituted or unsubstituted C6 to C20 aryl group, and
• q1 and q2 are each independently an integer of 0 to 5,
• wherein, in Chemical Formula 2,
• R3 is a nitro group,
• R4 and R5 are each independently a substituted or unsubstituted C1 to C10 alkyl group or a substituted or unsubstituted C1 to C10 alkoxy group,
• R6 is a substituted or unsubstituted C1 to C10 alkyl group,
• R7 is a substituted or unsubstituted C1 to C10 alkoxy group, and
• q3, q4, and q5 are each independently an integer of 0 to 5, and 1≤q4+q5≤5,
• wherein, in Chemical Formula 3,
• R8 to R10 are each independently a substituted or unsubstituted C1 to C10 alkyl group or a substituted or unsubstituted C1 to C10 alkoxy group,
• R11 is a substituted or unsubstituted C1 to C10 alkyl group, and
• q6 is an integer of 0 to 5,
• wherein, in Chemical Formula 4, R12 is a substituted or unsubstituted C1 to C10 alkyl group or a substituted or unsubstituted C3 to C10 cycloalkyl group,
• wherein, in Chemical Formula 6, R17 to R19 are each independently a substituted or unsubstituted C1 to C10 alkyl group.