A laptop computer is disclosed. The laptop computer comprises a processor, a memory, a graphics controller, a display panel and a display housing. The display housing is for holding the display panel. The display housing has an opening for fixing a replaceable camera module or a replaceable cover module selectively. When the replaceable camera module is fixed to the opening, the replaceable camera module is electrically connected with the graphics controller and provides pixel data. The graphics controller then drives the display panel to display the pixel data.