Abstract: A segmental display device includes a window plate having a plurality of segmental openings for indicating selected characters. A plurality of closure members are supported on a rotatable shafts extending in parallel to the plurality of segmental openings, respectively, and adapted to close selected one of the plurality of segmental openings to indicate the selected characters. A plurality of actuating units are mounted on the window plate adjacent the segmental openings, respectively, and operatively connected to the rotatable shafts for selectively rotating the closure members. Light is provided from a source within a casing, so that the display contrast and visibility will effectively increase as the level of ambient lighting decreases.