COORDINATE INPUT DEVICE, COORDINATE DETECTION METHOD, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To improve the detecting precision of coordinates indicated on a display screen.

SOLUTION: On the basis of knowledge that there are an area where the influence (sensitivity level) of a difference (angle detection error) between an angle acquired from an indication-input pixel number and an actual angle to be given to the calculating precision of indication-input coordinates is large and an area where any problem is not generated in practice in a coordinate input effective area 3, an approximate expression for converting the indication-input pixel number into angle information is corrected so that the angle detection error of the area where the influence to be given to the calculating precision of the indication-input coordinates is large can be minimized. Then, anglesΘRandΘLare calculated by using the corrected approximate expression, and indication-input coodinates P are calculated from the calculated anglesΘRandΘL.

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