System and method for regulating voltages in a display device having an integrated sensing device

A display driver for a display device comprising:

• a capacitor configured to be coupled to at least one gate line of the display device, wherein the capacitor is modulated outputting a modulated voltage signal;
• and
• a voltage regulation system coupled the output of the capacitor, the voltage regulation system comprising:
• a charge pump configured to output a current signal to the capacitor;
• a voltage regulator configured to:
• sample the modulated voltage signal at a first rate generating a sampled voltage, compare the sampled voltage to a target voltage and
• generate a first control signal based on the comparison;
• and
• a current regulator coupled to the voltage regulator and the charge pump and configured to:
• sample the current signal at a second rate, wherein the first rate differs from the second rate;
• and
• regulate the current signal based at least in part on the first control signal.

A method for regulating a voltage for a display driver, said method comprises:

• sampling a modulated voltage signal at a first rate to generate a sampled voltage, wherein the modulated voltage signal corresponds to a capacitive sensing signal driven onto one or more sensing electrodes for capacitive sensing, wherein the first rate is based on a sensing cycle rate of the capacitive sensing signal, wherein an output of a capacitor is modulated to produce the modulated voltage signal and wherein the capacitor is driven by a current signal of a charge pump;
• comparing the sampled voltage to a target voltage to determine if the sampled voltage is one of greater than and less than the target voltage;
• sampling the current signal at a second rate, wherein the second rate is based on a burst rate of the capacitive sensing signal;
• and
• regulating the current signal based on a determination that the sampled voltage is less than the target voltage.