Mouse apparatus and computer system having same

A mouse apparatus for controlling movement of a cursor on a display screen of a display unit of an information technology system, the mouse apparatus being in communication with a host unit of the information technology system, the display unit being connected to the host unit, the mouse apparatus comprising:

• a light pointer configured for emitting invisible light in a predetermined wavelength range toward the display screen;
• a selectively reflective layer disposed over the display screen, the selectively reflective layer being transmissive to visible light and reflective to the invisible light from the light pointer, thereby an invisible light spot is formed by the light pointer on the selectively reflective layer;
• a plurality of light sources disposed on the display screen, the light sources being spaced apart from each other;
• an image sensing module configured for capturing images of the light sources and the invisible light spot;
• a processor configured for receiving the images from the image sensing module at a predetermined frequency, analyzing differential changes between the images caused by a movement of the mouse apparatus imparted by a user, processing the differential changes into a control signal, and outputting the control signal to the host unit to control movement of the cursor on the display screen in response to the movement of the mouse apparatus.