Differential input circuit, amplification circuit, and display apparatus

An amplifier circuit, comprising:

• a differential input circuit, comprising:
• a first power sub-circuit configured to output a first signal, a second signal, and a third signal under control of a first bias signal, wherein the third signal is transmitted to a first node;
• a second power sub-circuit connected to the first power sub-circuit, receiving the first signal, and outputting a fourth signal and a fifth signal, wherein the fifth signal is transmitted to a second node;
• a first shunt sub-circuit connected to a fourth signal output terminal outputting the fourth signal, a differential input signal terminal, and the first node, and configured to transmit the fourth signal to the first node under control of a differential input signal at the differential input signal terminal;
• a second shunt sub-circuit connected to a second signal output terminal outputting the second signal, the differential input signal terminal, and the second node, and configured to transmit the second signal to the second node under control of the differential input signal at the differential input signal terminal;
• a first output sub-circuit connected to the differential input signal terminal, the first node, and a differential output terminal, and configured to output a first output signal under control of the differential input signal at the differential input signal terminal;
• and
• a second output sub-circuit connected to the differential input signal terminal, the second node, and the differential output terminal, and configured to output a second output signal under control of the differential input signal at the differential input signal terminal.

A driving method of a differential input circuit configured to drive the differential input circuit, comprising:

• providing the differential input circuit, wherein the differential input circuit comprises:
• a first power sub-circuit configured to output a first signal, a second signal, and a third signal under control of a first bias signal, wherein the third signal is transmitted to a first node;
• a second power sub-circuit connected to the first power sub-circuit, receiving the first signal, and outputting a fourth signal and a fifth signal, wherein the fifth signal is transmitted to a second node;
• a first shunt sub-circuit connected to a fourth signal output terminal outputting the fourth signal, a differential input signal terminal, and the first node, and configured to transmit the fourth signal to the first node under control of a differential input signal at the differential input signal terminal;
• a second shunt sub-circuit connected to a second signal output terminal outputting the second signal, the differential input signal terminal, and the second node, and configured to transmit the second signal to the second node under control of the differential input signal at the differential input signal terminal;
• a first output sub-circuit connected to the differential input signal terminal, the first node, and a differential output terminal, and configured to output a first output signal under control of the differential input signal at the differential input signal terminal;
• and
• a second output sub-circuit connected to the differential input signal terminal, the second node, and the differential output terminal, and configured to output a second output signal under control of the differential input signal at the differential input signal terminal;
• controlling a first power module to output a first signal, a second signal and a third signal through a first bias signal, and a second power module receiving the first signal and outputting a fourth signal and a fifth signal;
• and
• controlling a first shunt module, a second shunt module, a first output module and a second output module by a differential input signal to implement a constant transconductance of the differential input circuit in response to the differential input signal changes.