The display comprises pixels and dots. The ink leakage detector includes a plurality of resistance temperature detectors or resistive thermal devices to detect the leaked phase change ink. It is determined based on the one derived degree of similarity whether the object in the input image belongs to the same category as the object in the registered image. The at least one electrode portion is disposed between each of the island portions and the second band shaped member, a first end portion thereof is connected to the second band shaped member, and a second end portion thereof is opposed to the second end portion of each of the island portions.