Coordinate position detecting method and display apparatus using the same

A coordinate position detecting method using a plurality of light emitting elements and a plurality of light receiving elements located on mutually opposite sides, all the elements being arranged at a predetermined interval in horizontal and vertical directions, with each pair of mutually opposed light emitting element and light receiving element forming a light beam path, such that the coordinate position of a light blocking object can be detected once the light beam path is blocked, said method comprising:

• storing N previous coordinate datas obtained when detecting a movement of the light blocking ojecte, using n (1≦n≦N) coordinate datas of the N previous coordinate datas to calculate a coordinate position of the light blocking object;
• and
• changing the number of the coordinate datas for use in calculating the coordinate position, in accordance with a speed of the movment of the light blocking object,
• said method further comprising:
• setting a first mode for successively rendering light emitting elements (in a first range including all the light emitting elements) to emit light beams to perform scanning operation, and for calculating a coordinate position at which a light beam is blocked;
• and
• setting a second mode for successively rendering light emitting elements (in a second range which is smaller than the first range but including a light emitting element corresponding to a beam-blocked position) to emit light beams and for calculating a coordinate position at which a light beam is blocked;
• wherein after a beam-blocked position is calculated in the first mode, another beam-blocked position is calculated in the second mode.

A coordinate position detecting method using a plurality of light emitting elements and a plurality of light receiving elements located on mutually opposite sides, all the elements being arranged at a predetermined interval in horizontal and vertical directions, with each pair of mutually opposed light emitting element and light receiving element forming a light beam path, such that the coordinate position of a light blocking object can be detected once the light beam path is blocked, said method comprising:

• storing N previous coordinate datas obtained when detecting a movement of the light blocking ojecte, using n (1≦n≦N) coordinate datas of the N previous coordinate datas to calculate a coordinate position of the light blocking object;
• and
• changing the number of the coordinate datas for use in calculating the coordinate position, in accordance with a speed of the movment of the light blocking object,
• said method further comprising:
• setting a first mode for successively rendering light emitting elements (in a first range including all the light emitting elements) to emit light beams to perform scanning operation, and for calculating a coordinate position at which a light beam is blocked;
• and
• setting a second mode for successively rendering light emitting elements (in a second range which is smaller than the first range but including a light emitting element corresponding to a beam-blocked position) to emit light beams, and for calculating a coordinate position at which a light beam is blocked, further for reducing and rendering light emitting elements (in the first range not including the second range) to emit light beams so as to detect the coordinate position of the light blocking object,
• wherein after a beam-blocked position is calculated in the first mode, another beam-blocked position is calculated in the second mode.