Coordinate input device

A transparent coordinate input device comprising:

• a transparent insulating substrate;
• a flat transparent resistor film of a rectangular shape which is formed on said substrate;
• detection electrodes, electrically connected to four sides of said transparent resistor film, for causing a current to flow along one of current flow-in and flow-out directions with respect to said transparent resistor film;
• a conductive electrical pen for specifying an input position on said transparent resistor film;
• a power source circuit, electrically connected to said electrical pen, for supplying a drive current to said transparent resistor film from the input position;
• detecting means, connected to said detection electrodes, for detecting coordinates of the input position specified by said electrical pen in accordance with outputs from said detection electrodes;
• and
• correcting means for correcting an input position detection error as a difference between the input position specified by said electrical pen and a detected position detected by said detecting means.

A transparent coordinate input/display device comprising:

• a coordinate input unit having a transparent insulating substrate, a flat transparent resistor film of a rectangular shape which is formed on said substrate, and detection electrodes, electrically connected to four sides of said transparent resistor film, for causing a current to flow along one of current flow-in and flow-out directions with respect to said transparent resistor film;
• a conductive electrical pen for specifying an input position on said transparent resistor film;
• a power source circuit, electrically connected to said electrical pen, for supplying a drive current to said transparent resistor film from the input position;
• detecting means, connected to said detection electrodes, for detecting coordinates of the input position specified by said electrical pen in accordance with outputs from said detection electrodes;
• correcting means for correcting an input position detection error as a difference between the input position specified by said electrical pen and a detected position detected by said detecting means;
• a coordinate display unit integrally formed with said coordinate input unit so as to overlap a coordinate input plane with a coordinate display screen, so that an input point on the coordinate input plane of said transparent resistor film in said coordinate input unit is displayed at an identical position on the coordinate display screen;
• and
• correction data input means for entering the coordinate correction data in said coordinate correction table.