The present application discloses a calibration apparatus associated with a sub-pixel circuit, a source electrode driving circuit, and a method for compensating data voltage applied to the data line of the sub-pixel circuit associated with a data line and a sense line. The calibration apparatus includes a capacitance measurement circuit to output a capacitance measurement voltage related to the sense line, a charge sensing circuit to sense a charge voltage on the sense line when the data line is applied with a reference data voltage, and a parameter calibrator to calculate parameters of driving transistor in the sub-pixel circuit based on the capacitance measurement voltage, the reference data voltage, and the charge voltage, and is configured to determine electrical parameter drifts of the driving transistor for the source electrode driving circuit to determine a compensation data voltage to compensate non-uniformity of luminance due to the electrical parameter drifts.