Coordinate position information output device
First Claim
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1. A coordinate position information output apparatus comprising:
- a. a coordinate position indicating plate having a plurality of row electrodes and a plurality of column electrodes intersectingly disposed thereon defining intersection points, and an impedance element located at each intersection point of said electrodes;
b. an external address means for addressing selected intersection points and thereby reducing the impedance and establishing a current path between corresponding electrodes;
c. a plurality of unidirectional conducting elements each having a relatively long charge storage time and respectively connected to a corresponding one of row and column electrodes to provide a unidirectional current conducting path to each of said intersecting points;
d. a first circuit means for applying a forward voltage to said unidirectional conducting elements causing charge to be stored and a forward current to flow in said unidirectional conducting elements corresponding to addressed intersecting points of said plate;
e. second circuit means for applying a reverse voltage to said unidirectional conducting elements substantially immediately after the termination of said forward voltage, causing reverse current to flow in said undirectional conducting elements connected to said electrodes corresponding to addressed intersecting points; and
f. a matrix display device including a plurality of input conductors each corresponding to a respective one of said row and column electrodes, each of said input conductors being connected to respective ones of said unidirectional conducting elements;
whereby coordinate display information is supplied to said matrix display device by said input conductors as said reverse current flows in said unidirectional conducting elements in proportion to the charge stored therein.
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Abstract
A coordinate position information output device is disclosed in which the impedance at a position addressed by a contact pen, a light pen, a magnetic pen or the like is varied; a forward current is caused to flow by the impedance change in a charge storage diode; and a backward current flowing in the charge storage diode for a moment immediately thereafter is utilized as coordinate position information.
99 Citations
13 Claims
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1. A coordinate position information output apparatus comprising:
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a. a coordinate position indicating plate having a plurality of row electrodes and a plurality of column electrodes intersectingly disposed thereon defining intersection points, and an impedance element located at each intersection point of said electrodes; b. an external address means for addressing selected intersection points and thereby reducing the impedance and establishing a current path between corresponding electrodes; c. a plurality of unidirectional conducting elements each having a relatively long charge storage time and respectively connected to a corresponding one of row and column electrodes to provide a unidirectional current conducting path to each of said intersecting points; d. a first circuit means for applying a forward voltage to said unidirectional conducting elements causing charge to be stored and a forward current to flow in said unidirectional conducting elements corresponding to addressed intersecting points of said plate; e. second circuit means for applying a reverse voltage to said unidirectional conducting elements substantially immediately after the termination of said forward voltage, causing reverse current to flow in said undirectional conducting elements connected to said electrodes corresponding to addressed intersecting points; and f. a matrix display device including a plurality of input conductors each corresponding to a respective one of said row and column electrodes, each of said input conductors being connected to respective ones of said unidirectional conducting elements; whereby coordinate display information is supplied to said matrix display device by said input conductors as said reverse current flows in said unidirectional conducting elements in proportion to the charge stored therein. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A coordinate position information output apparatus comprising:
- a coordinate position indicating plate with a first surface, a plurality of row electrodes and a plurality of column electrodes disposed on said first surface forming electrode intersecting points and defining address points, impedance element means establishing electrical resistance between said plurality of row electrodes and said plurality of column electrodes at said intersecting points;
an external addressing means for lowering the resistance between said row electrodes and said column electrodes corresponding to selected address points; a first circuit means including a plurality of charge storage diodes, each of which is connected to a corresponding one of said row and column electrodes, said first circuit means applying a forward voltage to said charge storage diodes, said charge storage diodes being connected to said electrodes so as to maintain a forward current flow through said corresponding charge storage diodes when said corresponding address point is addressed by said external address means and said forward voltage is applied; second circuit means connected to said charge storage diodes and applying a reverse voltage thereto at the termination of said forward voltage causing said charge storage diodes which were maintaining a forward current flow to momentarily maintain a reverse current flow; a matrix display panel having a first set of electrodes which correspond to said plurality of row electrodes, a second set of electrodes which correspond to said plurality of column electrodes, wherein said first set of electrodes form intersections with said second set of electrodes and are separated by a display medium, said intersections defining display points on said matrix display panel, each electrode of said first and second sets of electrodes being connected to a respective one of said charge storage diodes whereby said reverse current flows in said corresponding electrodes of said first and second sets of electrodes, thereby activating said display medium in said matrix display panel corresponding to said address points. - View Dependent Claims (9, 10, 11, 12, 13)
- a coordinate position indicating plate with a first surface, a plurality of row electrodes and a plurality of column electrodes disposed on said first surface forming electrode intersecting points and defining address points, impedance element means establishing electrical resistance between said plurality of row electrodes and said plurality of column electrodes at said intersecting points;
Specification