In driving a liquid crystal display device, respective voltages of picture signals supplied in subframe periods are changed so as to enlarge a voltage difference between a gradation voltage of a picture signal supplied in the first subframe period and a gradation voltage of a picture signal supplied in the second subframe period. This removable paint is applied to a surface by roller, screen printing, spraying or brushing and can be removed by a remover which is basically an alkali material with a surfactant. The indicator member may comprises a single plug member removably disposed on said handle portion, or a pair of plug members disposed on opposite lateral ends of said handle portion.