In order to form the wiring pattern 212 on the depression 202 and electrode removing strip 208, first, as shown in FIG. 5F, over the whole surface of the glass substrate 230 is formed an electrode film 234 of a metal such as aluminum (Al), silver (Ag), and gold (Au), or a transparent electrode material such as ITO. This electrode film 234 may be formed by vapor deposition, sputtering, or ion plati