Patent ID: 7355573

Claim:
A residual image display device, comprising: a substantially bar-shaped housing; a plurality of light-emitting diodes arranged along a longitudinal direction of said housing; a light-emitting means for making each of said light-emitting diodes emit light individually, a light-receiving means for outputting a signal based on photoelectromotive force generated in individual light-emitting diodes among said plurality of light-emitting diodes; a scanning control means for controlling said light-emitting means to make each of said light-emitting diodes emit light which is positioned neighboring said each of part of light-emitting diodes that said light-receiving means outputs said signal based on the photoelectromotive force of, and for controlling said light-receiving means to output said signal in the light-emitting state; a generating means for generating two-dimensional residual image data of said plurality of light-emitting diodes, based on the signals which are outputted from said light-receiving means and which are based on the photoelectromotive force of said part of light-emitting diodes; a storing means for storing said two-dimensional residual image data; and a light-emission control means for controlling said light-emitting means to make said plurality of light-emitting diodes emit light based on said two-dimensional residual image data stored in said storing means, in accordance with swinging of said housing.