Abstract: A display device has a power supply for supplying operating power, a display unit that is driven by power from the power supply for displaying image information and has an image retention characteristic for retaining displayed content, a remaining capacity estimating unit for estimating the remaining capacity of the power supply, and a control unit for controlling display of the image information to an undisplayed state when the estimated remaining capacity of the power supply drops below a predetermined threshold level.

Abstract: A display device has an electrophoretic display panel for displaying information, and an operating mode switching unit for changing between a normal mode in which information displayed on the electrophoretic display panel is redrawn at a predetermined redraw interval, and a reduced operation mode in which redrawing the electrophoretic display panel is stopped or the redraw interval is increased. The operating mode switching unit redraws a predetermined display area of the electrophoretic display panel to substantially the same color when changing to the reduced operation mode.

Abstract: The device has a frame body (12) that has a substantial C-shape in cross section and is mounted on the body of a user, a strip-shaped display panel (22) disposed along the peripheral surface of the frame body (12), and a driver IC (15) for driving the display panel (22), wherein the display panel (22) and the driver IC are provided to different flexible substrates (21A, 21B), and the flexible substrates (21A, 21B) are disposed along the peripheral surface of the frame body (12) without being superposed on each other.

Abstract: Disclosed is a display device characterized by comprising a frame having a ring shape and mounted on a user and a display unit arranged along the frame over substantially its entire circumference. The display device comprises a controller having judgment means for judging which position is the position where the display unit is arranged in relation to another display unit on the basis of a signal from a receiver, storage means for storing positional information in the judgment means, and display control means for controlling the display of the display unit on the basis of the positional information stored in the storage means. Further, disclosed is a display system comprising the display device and a communication unit for communicating with the display device.