| http://www.w3.org/ns/prov#value | - To generate voltage gradients and current flowing in at least one direction, drive circuitry 116 includes tri-state logic drivers (112, 113, 114, and 115) to drive the resistive layer at four points, for example the upper and lower left and right corners UL, UR, LR and LL. The drive signals are binary, for example where logic high corresponds to Vref=+Vcc such as 3 to 5 volts, and logic low corres
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