Position pointing device, program, and pointed position detecting method

A method of detecting a position pointed by a position pointing device, comprising:

• performing a process of causing a display device to display a scene for regulating a position pointed by the position pointing device:
• receiving discriminating information of a scan mode of a display device and calculated information of a pointed position from the position pointing device which discriminates a scan mode of a display device based on a light detection signal from a photosensor;
• calculating correcting information of the pointed position and transmitting the calculated correcting information to the position pointing device;
• correcting a count timing of a light detection timing based on the transmitted correcting information;
• and
• calculating a position pointed by the position pointing device based on the corrected count timing.

A method of detecting a position pointed by a position pointing device, comprising:

• performing a process of causing a display device to display a distinctive frame scene for detecting a frame lag of a light detection signal in a position pointing device;
• detecting a frame lag of a light detection signal due to a scan mode of a display device, based on an output timing of a video signal of the distinctive frame scene and an output timing of pointed position information which is output from the position pointing device corresponding to the distinctive frame scene;
• and
• calculating a position pointed by the position pointing device based on the detected frame lag.