Patent ID: 8785103

Claim:
A positive photosensitive resin composition comprising: (A) a polybenzoxazole precursor including a structural unit represented by the following Chemical Formula 3, a structural unit represented by the following Chemical Formula 4, or a combination thereof; (B) a photosensitive novolac resin comprising a structural unit represented by the following Chemical Formula 1 and a structural unit represented by the following Chemical Formula 2; and (C) a solvent: wherein, in Chemical Formulae 3 and 4, X 1 is independently a substituted or unsubstituted C6 to C30 aromatic organic group or a substituted or unsubstituted C1 to C30 alicyclic organic group, X 2 is independently a substituted or unsubstituted C6 to C30 aromatic organic group, a substituted or unsubstituted C3 to C30 alicyclic organic group, or a functional group represented by the following Chemical Formula 5, Y 1 and Y 2 are the same or different and are independently a substituted or unsubstituted C6 to C30 aromatic organic group or a substituted or unsubstituted C3 to C30 alicyclic organic group, and when the mol % of the structural unit of Chemical Formula 3 is m, and the mol % of the structural unit of Chemical Formula 4 is n in the polybenzoxazole precursor, and m+n is 100 mol %, m ranges from about 60 mol % to about 95 mol %, and n ranges from about 5 mol % to about 40 mol %, wherein, in Chemical Formula 5, R 21 to R 24 are the same or different and are independently hydrogen, substituted or unsubstituted C1 to C30 alkyl, substituted or unsubstituted C6 to C30 aryl, substituted or unsubstituted C1 to C30 alkoxy, or hydroxy, R 25 to R 26 are the same or different and are independently a single bond, substituted or unsubstituted C1 to C30 alkylene, or substituted or unsubstituted C6 to C30 arylene, and k is an integer ranging from 1 to 50, wherein, in Chemical Formulae 1 and 2, R 11 and R 12 are the same or different and are independently hydrogen or a quinone diazide sulfonyl group, wherein 50% or more of R 11 and R 12 in the photosensitive novolac resin is a quinone diazide sulfonyl group, R 13 and R 14 are the same or different and are independently C1 to C7 alkyl, and when the number of the structural unit of Chemical Formula 1 is x, and the number of the structural unit of Chemical Formula 2 is y in the photosensitive novolac resin, x+y ranges from about 2 to about 30, and x/(x+y) ranges from about 0.6 to about 0.95.