Patent ID: 8400432
Filing Date: 2013-03-19
Classification: G06F

Abstract:
1. A writing device comprising: a voltage application unit that applies a voltage to a display medium including a first display layer, a second display layer and a photoconductive layer, the first display layer transforming into a first state reflecting a first light having a first wavelength or a second state transmitting the first light in response to a first applied voltage, the second display layer transforming into a third state reflecting a second light having a second wavelength or a fourth state transmitting the second light in response to a second applied voltage, the photoconductive layer causing increase of the applied voltage to the first display layer and the second display layer; an irradiating unit that irradiates light to the display medium; a storage unit that stores location information showing a location of an overwriting device that outputs light; a first obtaining unit that obtains image data showing an original image; a reading unit that reads the location information from the storage unit; and a controller that controls the voltage application unit and the irradiating unit to cause the display medium to show an overlapped image including the obtained original image and an overwritten image overwritten on the original image, the overwritten image including a point corresponding to the location shown by the location information read by the reading unit.