A method and system for adjusting a screen resolution of a liquid crystal display module (LCM) of a portable electronic device are provided. The portable electronic device includes a touch panel, and a bay configured to receive and hold a stylus. The method includes receiving input signals received from the touch panel corresponding to user inputs, detecting usage statuses of the user inputs and generating a status notification indicative of the usage statuses of the user inputs; and adjusting the screen resolution of the LCM according to a determined current resolution mode of the LCM and a determined incompatibility of the resolution mode.