FIG. 8A is a plan view showing the layout of the one sub-pixel, and FIG. 8B is a cross-sectional view taken along line A???A in FIG. 8A. As shown, TFD 220 is composed of a first TFD 220 a and a second TFD 220 b, and includes a element substrate 200, an insulator 201 deposited on the element substrate 200, a first metallic layer 222, an oxide layer 224, as an insulator, which is formed by anodizing