Patent ID: 7019737
Filing Date: 2006-03-28
Classification: G09G

Abstract:
1. An electronic device comprising: a display having a memory effect, the display adapted to maintain an image thereon without receiving electric power; a driving circuit adapted to perform image writing on the display; a data processing unit which is connected to the driving circuit, the data processing unit including at least one central processing unit adapted to operate in a sleep state during which part of an internal circuit is inactivated after completion of image writing; a power supply circuit adapted to supply electric power to the driving circuit, the power supply circuit including one element selected from the group consisting of a booster circuit and a DC/DC converter; a data reader including a slot adapted to receive a data storage medium, the data reader adapted to read data stored on a received data storage medium; an operation section adapted to receive an input from a user; and a controller adapted to inactivate at least one part of the power supply circuit after completion of image writing, the controller adapted to reactivate the inactivated at least one part of the power supply circuit upon receiving an input from the operation section; wherein the at least one central processing unit changes from the sleep state to an active state and the data reader reads data from a data storage medium received in the data reader when the controller receives an input from the operation section, wherein the controller reactivates the inactivated at least one part of the power supply circuit after the data reader reads data from a data storage medium, wherein the driving circuit performs image writing on the display after the inactivated at least one part of the power supply circuit is reactivated, and wherein the controller inactivates the at least one part of the power supply circuit after completion of image writing, the at least one central processing unit subsequently changes to the sleep state, and the display maintains an image thereon without receiving electric power.