Coordinate input device
First Claim
1. A transparent coordinate input device comprising:
- a transparent insulating substrate;
a flat transparent resistor film of a rectangular shape 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 or flow-out directions with respect to said transparent resistor film;
a transparent protective layer on an upper surface of said transparent resistor film and having a planar resistance substantially higher than the resistance in the direction of the thickness thereof;
a conductive electrical pane for specifiying an input position on said transparent resistor film;
a DC power source circuit, electrically connected to said electrical pen, for supplying a DC drive current to said transparent resistor film from the input position; and
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.
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Accused Products
Abstract
A transparent coordinate input device can be used integrally with a display unit or overlap it and has a coordinate input panel (i.e., a transparent drawing pad). The input panel has a transparent insulating substrate, a flat transparent resistor film of a rectangular shape which is formed on the substrate, and detection electrodes, electrically connected to four sides of the transparent resistor film, for causing a current to flow along one of current flow-in and flow-out directions with respect to the transparent resistor film. The transparent coordinate input device also has a coordinate correction table for storing correction data representing the relationship between the input coordinate signals representing an input position of the electrical pen and the output coordinate signals representing a position and detected by a detector, and an operation circuit for performing coordinate correction by accessing the coordinate correction table.
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Citations
24 Claims
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1. A transparent coordinate input device comprising:
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a transparent insulating substrate; a flat transparent resistor film of a rectangular shape 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 or flow-out directions with respect to said transparent resistor film; a transparent protective layer on an upper surface of said transparent resistor film and having a planar resistance substantially higher than the resistance in the direction of the thickness thereof; a conductive electrical pane for specifiying an input position on said transparent resistor film; a DC power source circuit, electrically connected to said electrical pen, for supplying a DC drive current to said transparent resistor film from the input position; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transparent coordinate input device comprising:
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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. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A transparent coordinate input/display device comprising:
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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. - View Dependent Claims (22, 23, 24)
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Specification