The electronic device and the electronic system

The name of the present invention is an electronic device and electronic systems. Object is to provide a display apparatus, wherein the moving image mode and consumes less power or still image mode may be switched by a user's operation on a display screen on the screen automatically. The display device includes: a display panel including a photosensor for detecting touch input by a user; a display control circuit for displaying a keyboard on a portion of the display screen; and a storage medium which stores programs for controlling the supply to the display power program (application) of the still-image area of ​​the keyboard. The program for controlling the power supplied to the still picture region conserve power.