Video screen indicated position detecting method and device

An information storage medium storing a program for executing a video screen indicated position detecting method, said method comprising:

• associating each horizontal scan line of said video screen with a plurality of position indicating means, wherein adjacent horizontal scan lines are associated with different ones of the plurality of position indicating means;
• and
• during a scan portion of a current horizontal scan line, detecting an indicated position indicated by a position indicating means associated with the current horizontal scan line;
• and
• during a flyback portion of the current horizontal scan line, transmitting a coordinate corresponding to said indicated position.

A video screen position detecting device comprising:

• a first detector adapted to detect a first position on a video screen;
• a second detector adapted to detect a second position on the video screen;
• coordinate encoder, wherein said coordinate encoder
• is adapted to associated each horizontal scan line of said video screen with said first or second detectors, wherein adjacent horizontal scan lines are associated with different ones of said first and second detectors;
• and
• during a scan portion of a current horizontal scan line,
• if the current horizontal scan line is associated with the first detector, detecting the first position;
• or
• if the current horizontal scan line is associated with the second detector, detecting the second position;
• a transmitter, wherein
• during a flyback portion of the current horizontal scan line,
• if the current horizontal scan line is associated with said first detector, said transmitter transmits a first coordinate corresponding to the first position, or
• if the current horizontal scan line is associated with said second detector, said transmitter transmits a second coordinate corresponding to the second position.

A method of detecting an indicated location on a video screen comprising:

• orienting an first optical sensor to detect light from a first region at a location on a video screen;
• orienting an second optical sensor to detect light from a second region at a location on a video screen;
• associating each horizontal scan line of said video screen with one of said first or second optical sensors, wherein adjacent horizontal scan lines are associated with different ones of said first or second optical sensors;
• during a scan portion of a current horizontal scan line,
• if the current horizontal scan line is associated with said first optical sensor, detecting a change in luminescence of light emitted from said first region;
• or
• if the current horizontal scan line is associated with said second optical sensor, detecting a change in luminescence of light emitted from said second region;
• during a horizontal flyback portion of the current horizontal scan line,
• if the current horizontal scan line is associated with said first optical sensor, transmitting a first coordinate of said first region;
• or
• if the current horizontal scan line is associated with said second optical sensor, transmitting a second coordinate of said second region.

An indicated location detection device comprising:

• a first optical sensor adapted to detect a change in luminescence of light emitted from a first region of a video screen at a first time;
• and
• a second optical sensor adapted to detect a change in luminescence of light emitted from a second region of a video screen at a second time;
• and
• wherein a device,
• associates each horizontal scan line of said video screen with one of said first and second optical sensors, wherein adjacent horizontal scan lines are associated with different ones of said first and second optical sensors;
• during a horizontal scan portion of a current horizontal scan line,
• if said current horizontal scan line is associated with said first optical sensor, detect said first region;
• or
• if said current horizontal scan line is associated with said second optical sensor, detect said second region;
• and
• during a flyback portion of the current horizontal scan line,
• if said current horizontal scan line is associated with said first optical sensor, transmit a first coordinate associated with said first region;
• or
• if said current horizontal scan line is associated with said second optical sensor, transmit a second coordinate associated with said second region.