Display device having an integrated sensing device with reduced interference

A method for driving a common voltage electrode of an input device, the method comprising:

• driving a common voltage electrode of the input device with a fixed voltage during a display update period;
• and
• driving the common voltage electrode with a sensing signal during an input sensing period, the sensing signal having a duty cycle and a mean value, and having a high voltage value for first portions of the sensing period, and a low voltage value for second portions of the sensing period, the duty cycle specifying the relative temporal lengths of the first and second portions,
• wherein the duty cycle is configured to minimize a difference between the fixed voltage and the mean value, while complying with a minimum settling time of a sensor receiving the sensing signal.

An input device, comprising:

• one or more common voltage electrodes;
• and
• a processing system coupled to the one or more common voltage electrodes configured to:
• drive the one or more common voltage electrodes with a fixed voltage during a display update period;
• and
• drive the one or more common voltage electrodes with a sensing signal during an input sensing period, the sensing signal having a mean value and a duty cycle, and having a high voltage value for first portions of the sensing period, and a low voltage value for second portions of the sensing period, the duty cycle specifying the relative temporal lengths of the first and second portions,
• wherein the duty cycle is configured to minimize a difference between the mean value and the fixed voltage, while complying with a minimum settling time of a sensor receiving the sensing signal.