A mobile device is disclosed. The mobile device includes a frame structure including a side edge frame and a horizontal baffle, the side edge frame forming side edges of the mobile device, the horizontal baffle including a rim connected with interior walls of the side edge frame; and a screen module including side edges sized to fit in a space surrounded by the interior walls of the side edge frame, a bottom surface of the screen module being connected with an upper surface of the horizontal baffle, each of the side edges of the screen module being attached to a corresponding interior wall of the side edge frame.