1. Technical Field
The present invention relates to a circuit board, an electro-optical device, and an electric apparatus.
2. Related Art
Recently, as a device substituting for a thin-film field effect transistor using inorganic materials such as silicon, an organic thin-film field effect transistor has attracted attention. This is because a method of manufacturing constituent elements of such an organic thin-film field effect transistor is simple, properties of the constituent material can be changed by changing the molecular structure of the organic semiconductor material and the organic thin film field effect transistor is more flexible, lighter, and stronger than the thin-film field effect transistor formed using an inorganic semiconductor.
Since there is interaction between a substrate and a semiconductor layer forming a transistor, it is important which material is selected for forming the substrate. For example, JP-A-2005-101555 discloses a study of an organic field effect transistor having an organic insulating layer containing an aromatic compound.
However, the optimum amount of an active group to be contained in an insulating layer of a transistor and a relationship of electrical resistance between the insulating layer and a semiconductor layer required consideration. Additionally, mobility of charge carriers of the semiconductor may not be sufficiently improved.