An electrode supported electrolyte membrane includes an electrode layer 630 facing an electrolyte layer 620. The surface area of the gate electrode ranging from the inner periphery to a position adjacent to the convex contacting portion, is coated with an insulation film. The second diffractive grating region has segments combined to each other, and has second discrete peaks of a reflection spectrum. Most preferably, a five layer insulator pad has the polyurethane foam sandwiched between stiffening layers and also has outer layers of polyurethane foam, applied adjacent to the stiffening layers, forming the top and bottom surfaces of the pad. A width in the circumferential direction of a first opening is set smaller than a width in the circumferential direction of a second opening different from the first opening, and a bending strength of the flat cable passing through the first opening is set greater than that of the other flat cables. From one perspective, the pixels take on the hue of the destination color, the luminance of the source color and a saturation that depends on the relationship between the source color and destination colors.