To provide a color filter substrate and transflective type electro-optical device capable of ensuring both brightness of reflective display and saturation of transmissive display. Vehicle information, about an automotive vehicle, is received. In one embodiment, one or more vent holes are provided in the battery case, advantageously in the cover portion, to permit gases to escape. The at least one active electrode assembly and the controller may be arranged in a housing. The invention allows a threshold analysis to be performed, which graphically depicts the size and location of areas exhibiting significant change in color, which is a determinant factor in medical diagnosis.