Patent ID: 9606662
Date: 2017-03-28
CPC Classifications: G06F,G06K

Claim:
1. A system for identifying a tool touching a touchscreen device, the system comprising: touch detection circuitry, including: tool identification circuitry, including: wherein: the electrode selector switch is operated to select one of the plurality of electrodes that is nearest to the touch location determined by the touch detection circuitry, thereby completing a circuit that includes the signal generator, the resistive path through the tool, the resistive layer, the demodulator, the selected electrode, and the parasitic capacitance path; the signal generator is operated to transmit a modulated identification (ID) signal over the circuit; the demodulator is operated to receive the modulated ID signal over the circuit, and to demodulate the modulated ID signal and recover a bit sequence; and logic is operated to identify the tool, based on the recovered bit sequence.