Touch panel module and method for determining position of touch point on touch panel

A touch panel module, comprising:

• a surface panel, wherein a first retro-reflector, a second retro-reflector, and a third retro-reflector are respectively positioned at a first side, a second side, and a third side of the surface panel, and the second side neighbors the first side, and the third side is opposite to the first side;
• a first band splitter, positioned upon the third retro-reflector, wherein a light beam having frequencies within a first band is totally reflected by the first band splitter, and a light beam having frequencies within a second band transmits to the first band splitter;
• a first optical unit, for generating a first band light beam having frequencies within the first band, and for receiving a reflected first band light beam reflected by one of the first and second retro-reflectors to generate a first signal;
• and
• a control unit, coupled to the first optical unit, for performing touch point detection according to the first signal.

A method for determining a position of a touch point on a touch panel, comprising:

• positioning borders with a setting pattern at a first side and a second side of a surface panel, wherein the second side neighbors the first side;
• positioning a mirror at a third side of the surface panel, wherein the third side is opposite to the first side;
• fetching a physical image of the second side and a mirrored image of the first and second side of the surface panel;
• and
• performing touch point detection according to fetched images of the first and the second side of the surface panel.

A method for determining a position of a touch point on a touch panel, comprising:

• respectively positioning a first retro-reflector, a second retro-reflector, and a third retro-reflector at a first side, a second side, and a third side of a surface panel, wherein the second side neighbors the first side, and the third side is opposite to the first side;
• positioning a band splitter upon the third retro-reflector, wherein a light beam having frequencies within a first band is totally reflected by the band splitter, and a light beam having frequencies within a second band transmits to the band splitter;
• generating a first band light beam having frequencies within the first band;
• receiving a reflected first band light beam reflected by one of the first and second retro-reflectors to generate a first signal;
• and
• performing touch point detection according to the first signal.