Patent ID: 7230602

Claim:
A source driver, suitable for use in a panel display apparatus to drive a display array unit according to a plurality of input signals, the source driver comprising: a driving circuit, a logic control circuit, an input level shifter, a logic speed monitoring unit, an internal logic voltage generator, a substrate voltage generator, a substrate leakage-current monitoring unit and a power management control unit, wherein the driving circuit receives a portion of these input signals to drive the display array unit; the logic control circuit coupled with the driving circuit generates a control signal to control the driving circuit; the input level shifter receives a system input signal to transform an input level of the system input signal into a logic level to input to the logic control circuit; the internal logic voltage generator receives a substrate voltage generated by the substrate voltage generator and an external logic voltage, and receives a control signal of the power management control unit to generate an internal logic voltage to the logic control circuit, the input level shifter and the logic speed monitoring unit; the logic speed monitoring unit feeds back a logic speed signal to the power management control unit; the substrate voltage generator receives an external logic voltage and a control signal of the power management control unit to generate the substrate voltage to at least one of the logic control circuit, the input level shifter and the internal logic voltage generator; the substrate leakage-current monitoring unit feeds back a feedback signal to the power management control unit according to a quantity of a substrate leakage-current of the source driver; and the power management control unit receives the feedback signal of the logic speed monitoring unit, the feedback signal of the substrate leakage-current monitoring unit and an external control signal or the control signal of the internal logic voltage generator to generate the control signal of the substrate voltage generator and the control signal of the internal logic voltage generator.