Tablet system with digital activation
First Claim
1. A tablet system comprising,a tablet having a plurality of closely spaced X dimension wires and a plurality of closely spaced Y dimension wires,means including an oscillator for providing an alternating sequence of binary voltage levels representing 1 and 0 logic values,driver means for applying said aternating voltage level sequence to said wires, said driver means being individual to said wires for giving an individual wire a selected state of activation with said alternating voltage level sequence,means for controlling said drivers to produce a selected pattern of activation of said wires in a selected dimension in which wires on one side of a selected tablet position are activated and wires on the other side of said selected position are not activated and a transition in the activation pattern occurs at said selected position,a pen positionable on the tablet to be capacitively coupled to said wires for receiving said alternating voltage level sequence signal, andmeans for receiving said signal from said pen and for forming a pen positiion address in the selected dimension.
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Abstract
An improved tablet system is disclosed of the type having an array of X and Y dimension wires that are capacitively coupled to a pen that a user holds to the tablet to produce a position signal. Drivers are provided for individual wires to produce a selected activation pattern for the wires. The drivers are operated from a shift register and associated components that are mounted on the tablet and are connected to an associated processor through only a small number of conductors.
30 Citations
7 Claims
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1. A tablet system comprising,
a tablet having a plurality of closely spaced X dimension wires and a plurality of closely spaced Y dimension wires, means including an oscillator for providing an alternating sequence of binary voltage levels representing 1 and 0 logic values, driver means for applying said aternating voltage level sequence to said wires, said driver means being individual to said wires for giving an individual wire a selected state of activation with said alternating voltage level sequence, means for controlling said drivers to produce a selected pattern of activation of said wires in a selected dimension in which wires on one side of a selected tablet position are activated and wires on the other side of said selected position are not activated and a transition in the activation pattern occurs at said selected position, a pen positionable on the tablet to be capacitively coupled to said wires for receiving said alternating voltage level sequence signal, and means for receiving said signal from said pen and for forming a pen positiion address in the selected dimension.
Specification