Patent ID: 9581628
Date: 2017-02-28
CPC Classifications: G01R,G06K,Y10T

Claim:
1. An electronic device comprising: a housing; circuitry carried by said housing and having a device ground associated therewith; an array of biometric finger sensing pixel electrodes configured to sense biometric data; an array shielding electrode outside said array of biometric finger sensing pixels; a finger coupling electrode outside said array shielding electrode and coupled to the device ground, the finger coupling electrode being coupled to the device ground causing noise in the sensed biometric data relative to the finger coupling electrode; and drive circuitry capable of generating a drive signal for said array of biometric finger sensing pixel electrodes and a compensating drive signal comprising a scaled replica of the drive signal for said array shielding electrode, the compensating drive signal reducing the noise in the sensed biometric data.