Patent ID: 7939819

Claim:
A circuit board, comprising: a source electrode, a drain electrode, and a gate electrode provided above a surface of a substrate; a first insulating layer insulating the source electrode and the drain electrode from the gate electrode; an organic semiconductor layer provided under the first insulating layer so as to contact the first insulating layer; and a second insulating layer provided under the organic semiconductor layer so as to contact the organic semiconductor layer, wherein the first and second insulating layers each include a compound represented by Formula 1, where R 1 and R 2 each independently represent a substituted or unsubstituted alkylene group; X 1 , X 2 , X 3 , and X 4 each represent hydrogen or an electrophilic group but are not all hydrogen; and n represents a number in the range of 100 to 100,000; and wherein at least one of X 1 , X 2 , X 3 , and X 4 is an electrophilic group selected from the group consisting of an —OH group, an —NO 2 group, a phenyl group, and an —SH group.