Pointer positioning system

A pointer positioning system, comprising:

• an image generating unit for forming an image on a display region;
• a light-spot generating unit for projecting invisible light to form invisible-light spots on the display region, wherein the invisible-light spots include positioning spots and identifying spots, and the positioning spots divide the display region into several sections, further wherein the positioning spots have different parts respectively in the neighboring sections, so that each of the sections has some of the positioning spots therein, and an arrangement of the positioning spots in one of the sections is different from an arrangement of the positioning spots in the other one of the sections;
• an operating unit having an invisible-light camera to sense an image of a part of the entire display region, wherein the operating unit generates an identification signal according to a distribution of the positioning spots and the identifying spots in the image sensed by the invisible-light camera;
• a calculating unit having a memory to store a reference distribution of the positioning spots and the identifying spots, wherein the calculating unit receives the identification signal from the operating unit and compares the distribution of the positioning spots and the identifying spots which is sensed by the invisible-light camera with the reference distribution to obtain a position signal accordingly, further wherein the position signal indicates a pointing position in the image sensed by the invisible-light camera;
• and
• an image unit receiving the position signal from the calculating unit and generating an image signal, wherein the image signal is transmitted to the image generating unit to show a pointer image at the pointing position of the display region.