Amplifier circuit applied in source driver of liquid crystal display

An amplifier circuit applied in a source driver of a liquid crystal display, the amplifier circuit comprising:

• a differential input stage configured to receive a positive input voltage and a negative input voltage respectively;
• a first output stage coupled between a first voltage and a second voltage, the first output stage comprising a first transistor and a second transistor coupled to the differential input stage respectively, wherein the second voltage is smaller than the first voltage;
• a second output stage coupled between the second voltage and a third voltage, the second output stage comprising a third transistor and a fourth transistor coupled to the differential input stage respectively, wherein the third voltage is smaller than the second voltage;
• and
• a detection module coupled to the positive input voltage, the first output stage and the second output stage respectively, the detection module being configured to detect whether the positive input voltage is smaller than a reference voltage and selectively switch the first output stage on and switch the second output stage off or switch the second output stage on and switch the first output stage off according to a detection result of the detection module.