The second insulating layer can be formed of an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, or aluminum oxynitride; acrylic acid, methacrylic acid, or a derivative thereof; a heat-resistant high molecular weight material such as polyimide, aromatic polyamide, or polybenzimidazole; an inorganic siloxane polymer includin