Patent ID: 7733324

Claim:
A display device comprising: a memory type display including: a display layer adapted to display an image by displaying predetermined colors according to an applied voltage; and multiple picture electrodes and a common electrode sandwiching the display layer; a driving circuit electrically coupled to the multiple picture electrodes and adapted to apply a predetermined voltage between the multiple picture electrodes and the common electrode so that an electric potential of the multiple picture electrodes is controlled and a predetermined image is displayed on the display layer; and an image erasing circuit directly electrically coupled between the common electrode and a power source, the image erasing circuit being adapted to selectively apply a voltage between the multiple picture electrodes and the common electrode when the driving circuit is broken and cannot apply the predetermined voltage so that the image would otherwise remain displayed on the display layer, the image erasing circuit directly connecting the power source to the common electrode independent of the driving circuit, wherein: the power source is an external power source and the image erasing circuit includes a switching section adapted to switch a connection destination of the common electrode to a terminal for supplying a reference electric potential or a power source terminal of the external power source.