Photosensitive ink composition, cured product, display panel, and method for producing cured product

A photosensitive ink composition comprising a photopolymerizable compound (A), and a photopolymerization initiator (C), and optionally comprising a solvent(S),

• wherein the photopolymerizable compound (A) consists of a sulfide compound (A1) represented by the following formula (a-1) and a (meth)acrylate compound (A2) represented by the following formula (a-2),
• wherein the photopolymerization initiator (C) is a combination of a phosphine oxide compound (C1) and an oxime ester compound (C2), and
• a ratio of a mass W2 of the oxime ester compound (C2) is 40% by mass or more and 90% by mass or less relative to the sum of a mass W1 of the phosphine oxide compound (C1) and the mass W2 of the oxime ester compound (C2),
• wherein, in the formula (a-1), R1 and R2 are each independently a hydrogen atom or a methyl group, R3 and R4 are each independently an alkyl group having 1 or more and 5 or less carbon atoms, and p and q are each independently 0 or 1:
• wherein, in the formula (a-2), R10 is a hydrogen atom or a methyl group, R11 is an alkylene group having 1 or more and 3 or less carbon atoms, R12 is a single bond, an oxygen atom, or a sulfur atom, R13 is an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 4 or less carbon atoms, a phenoxy group, or a phenyl group, s is an integer of 0 or more and 5 or less, and t is 0, 1 or 2
• wherein the phosphine oxide compound (C1) is selected from the group consisting of bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, and ethyl(2,4,6-trimethylbenzoyl)phenylphosphinate, and
• wherein the oxime ester compound (C2) comprises a compound represented by the following formula (C2-1),