Electronic device

An electronic device, adapted with a stylus, the electronic device comprising:

• a display panel, including a display area;
• a touch module, including a touchable area;
• and
• a processor, electrically connected to the display panel and the touch module, the processor defines an effective input area responding to the operation of the stylus in the touchable area, and defines a mapping display area corresponding to the effective input area in the display area, and adjusts a display ratio of the mapping display area according to an input ratio of the effective input area, wherein the effective input area comprises a sub-region of the touchable area;
• wherein the input ratio is equal to the display ratio, the display ratio is an aspect ratio of the mapping display area and the input ratio is an aspect ratio of the effective input area.