Patent ID: 8520034

Claim:
A chopper-stabilized signal generating apparatus applied to a thin-film transistor (TFT) liquid crystal display (LCD) having a plurality of OP amplifiers, the apparatus comprising: a sampling unit for sampling a voltage polarity control signal to obtain a sampling signal, and judging a manner of voltage transformation of a voltage polarity inversion of the voltage polarity control signal according to the sampling signal; a control unit coupled to the sampling unit; and a signal generating unit for generating a first chopper-stabilized signal or a second chopper-stabilized signal, selecting the first chopper-stabilized signal or the second chopper-stabilized signal as a chopper-stabilized signal, and outputting the selected chopper-stabilized signal to the OP amplifiers, wherein when the sampling unit judges the manner of voltage transformation of the voltage polarity inversion of the voltage polarity control signal as a one-line inversion or a two-line inversion, the control unit outputs a first trigger signal, and obtains a frame transformation signal template according to the sampling signal, the signal generating unit compares the frame transformation signal template with the sampling signal to generate a frame transformation signal, and the signal generating unit generates the first chopper-stabilized signal according to the first trigger signal in conjunction with the frame transformation signal and the voltage polarity control signal; wherein the voltage polarity control signal is generated by a timing controller of the TFT LCD; wherein the sampling unit comprises a register for receiving the voltage polarity control signal having a plurality of pulses, wherein the register continuously samples continuous n pulses of the voltage polarity control signal to obtain the sampling signal, and n is a positive integer, and an inversion checking device for judging whether the manner of voltage transformation of the voltage polarity control signal is the one-line inversion or the two-line inversion according to the sampling signal; and wherein the sampling unit further comprises a rule checking device; and when the control unit cannot obtain the frame transformation signal template according to the manner of voltage transformation of the voltage polarity inversion of the voltage polarity control signal and the sampling signal, the rule checking device enables the control unit to output a second trigger signal, and the signal generating unit generates the second chopper-stabilized signal according to the second trigger signal in conjunction with the voltage polarity control signal.