Data driving circuit and power supply noise suppression method

A data driving circuit includes a plurality of data drivers. Each data driver comprises a digital-to-analog conversion module, an output buffer module, a voltage detection module and a conversion rate control module. The digital-to-analog conversion module converts the image data into a conversion voltage. The output buffer module provides a driving voltage to the data line based on a predetermined slew rate and the slew voltage. The voltage detection module outputs a control signal in a first control state when judging that power supply noise exists in the working voltage and the grounding voltage provided by the power supply circuit according to the high-voltage reference voltage and the low-voltage reference voltage; the slew rate control module outputs a rate adjustment signal in a first adjustment state according to the control signal in the first control state so as to control the slew rate of the output buffer module to be reduced. The invention also provides a power supply noise suppression method. 一种