Display drive circuit comprising operational amplifier allowing connection to arbitrary load capacitance

1 . A drive circuit, comprising a first stage circuit, a second stage circuit, and an auxiliary circuit, wherein

the first stage circuit is configured to receive a first input signal and a second input signal, and amplify the first input signal and the second input signal to acquire a first output signal and a second output signal and output the first output signal and the second output signal to the second stage circuit,

the second stage circuit is configured to output a third output signal based on the first output signal and the second output signal to drive a load, and the second stage circuit is connected to the first stage circuit via a Miller capacitor, and

the auxiliary circuit is connected to the first stage circuit and the second stage circuit for reducing an output impedance of the first stage circuit,

wherein the auxiliary circuit comprises a first resistor and a second resistor, the first output signal is output by a first end of the first stage circuit, and the second output signal is output by a second end of the first stage circuit,

the first resistor is connected between a power supply voltage and the first end of the first stage circuit, and

the second resistor is connected between the second end of the first stage circuit and a ground.

2 . The drive circuit according to claim 1 , wherein the auxiliary circuit further comprises a first transistor and a second transistor,

the first transistor and the first resistor are connected in series between the power supply voltage and the first end of the first stage circuit, a current flowing through the first resistor also flows through a first electrode and a second electrode of the first transistor, a gate of the first transistor is connected to a farther one of the first and second electrodes of the first transistor from the power supply voltage, and the first transistor is configured to reduce the current flowing through the first resistor, and

the second transistor and the second resistor are connected in series between the second end of the first stage circuit and the ground, a current flowing through the second resistor also flows through a first electrode and a second electrode of the second transistor, a gate of the second transistor is connected to a farther one of the first and second electrodes of the second transistor from the ground, and the second transistor is configured to reduce the current flowing through the second resistor.

3 . The drive circuit according to claim 2 , wherein the auxiliary circuit further comprises a third transistor and a fourth transistor,

the third transistor, the first transistor, and the first resistor are connected in series between the power supply voltage and the first end of the first stage circuit, the current flowing through the first resistor also flows through a first electrode and a second electrode of the third transistor, a gate of the third transistor receives a first bias signal, and the third transistor is configured to control a maximum value of the current flowing through the first resistor to be smaller than a current value of a tail current of the first stage circuit, and

the fourth transistor, the second transistor, and the second resistor are connected in series between the second end of the first stage circuit and the ground, the current flowing through the second resistor also flows through a first electrode and a second electrode of the fourth transistor, a gate of the fourth transistor receives a second bias signal, and the fourth transistor is configured to control a maximum value of the current flowing through the second resistor to be smaller than the current value of the tail current of the first stage circuit.

4 . The drive circuit according to claim 3 , wherein

in response to the first bias signal causing the third transistor to operate in a linear region, the first output signal decreases and the current flowing through the first resistor increases,

in response to the first output signal being decreased such that the third transistor operates in a saturation region, the current flowing through the first resistor reaches the maximum value,

in response to the second bias signal causing the fourth transistor to operate in the linear region, the second output signal increases and the current flowing through the second resistor increases, and

in response to the second output signal being increased such that the fourth transistor operates in the saturation region, the current flowing through the second resistor reaches the maximum value.

5 . The drive circuit according to claim 4 , wherein the second stage circuit comprises a fifth transistor and a sixth transistor,

a first electrode of the fifth transistor is connected to the power supply voltage, a second electrode of the fifth transistor serves as a first end of the second stage circuit to output the third output signal, and a gate of the fifth transistor serves as a second end of the second stage circuit to receive the first output signal, and

a first electrode of the sixth transistor is connected to the second electrode of the fifth transistor, a second electrode of the sixth transistor is connected to the ground, and a gate of the sixth transistor serves as a third end of the second stage circuit to receive the second output signal, wherein

the fifth transistor and the sixth transistor have different polarities, the fifth transistor and the first transistor have a same polarity, and the sixth transistor and the second transistor have a same polarity.

6 . The drive circuit according to claim 3 , wherein the second stage circuit comprises a fifth transistor and a sixth transistor,

a first electrode of the fifth transistor is connected to the power supply voltage, a second electrode of the fifth transistor serves as a first end of the second stage circuit to output the third output signal, and a gate of the fifth transistor serves as a second end of the second stage circuit to receive the first output signal, and

a first electrode of the sixth transistor is connected to the second electrode of the fifth transistor, a second electrode of the sixth transistor is connected to the ground, and a gate of the sixth transistor serves as a third end of the second stage circuit to receive the second output signal, wherein

the fifth transistor and the sixth transistor have different polarities, the fifth transistor and the first transistor have a same polarity, and the sixth transistor and the second transistor have a same polarity.

7 . The drive circuit according to claim 2 , wherein the second stage circuit comprises a fifth transistor and a sixth transistor,

a first electrode of the fifth transistor is connected to the power supply voltage, a second electrode of the fifth transistor serves as a first end of the second stage circuit to output the third output signal, and a gate of the fifth transistor serves as a second end of the second stage circuit to receive the first output signal, and

a first electrode of the sixth transistor is connected to the second electrode of the fifth transistor, a second electrode of the sixth transistor is connected to the ground, and a gate of the sixth transistor serves as a third end of the second stage circuit to receive the second output signal, wherein

the fifth transistor and the sixth transistor have different polarities, the fifth transistor and the first transistor have a same polarity, and the sixth transistor and the second transistor have a same polarity.

8 . A display drive chip, comprising

a plurality of display units; and

a drive circuit connected to the plurality of display units, the drive circuit comprising a first stage circuit, a second stage circuit, and an auxiliary circuit, wherein

the first stage circuit is configured to receive a first input signal and a second input signal, and amplify the first input signal and the second input signal to acquire a first output signal and a second output signal and output the first output signal and the second output signal to the second stage circuit,

the second stage circuit is configured to output a third output signal based on the first output signal and the second output signal to drive a load, and the second stage circuit is connected to the first stage circuit via a Miller capacitor, and

the auxiliary circuit is connected to the first stage circuit and the second stage circuit for reducing an output impedance of the first stage circuit,

wherein the auxiliary circuit comprises a first resistor and a second resistor, the first output signal is output by a first end of the first stage circuit, and the second output signal is output by a second end of the first stage circuit,

the first resistor is connected between a power supply voltage and the first end of the first stage circuit, and

the second resistor is connected between the second end of the first stage circuit and a ground.

9 . The display drive chip according to claim 8 , wherein the auxiliary circuit further comprises a first transistor and a second transistor,

the first transistor and the first resistor are connected in series between the power supply voltage and the first end of the first stage circuit, a current flowing through the first resistor also flows through a first electrode and a second electrode of the first transistor, a gate of the first transistor is connected to a farther one of the first and second electrodes of the first transistor from the power supply voltage, and the first transistor is configured to reduce the current flowing through the first resistor, and

the second transistor and the second resistor are connected in series between the second end of the first stage circuit and the ground, a current flowing through the second resistor also flows through a first electrode and a second electrode of the second transistor, a gate of the second transistor is connected to a farther one of the first and second electrodes of the second transistor from the ground, and the second transistor is configured to reduce the current flowing through the second resistor.

10 . The display drive chip according to claim 9 , wherein the auxiliary circuit further comprises a third transistor and a fourth transistor,

the third transistor, the first transistor, and the first resistor are connected in series between the power supply voltage and the first end of the first stage circuit, the current flowing through the first resistor also flows through a first electrode and a second electrode of the third transistor, a gate of the third transistor receives a first bias signal, and the third transistor is configured to control a maximum value of the current flowing through the first resistor to be smaller than a current value of a tail current of the first stage circuit, and

the fourth transistor, the second transistor, and the second resistor are connected in series between the second end of the first stage circuit and the ground, the current flowing through the second resistor also flows through a first electrode and a second electrode of the fourth transistor, a gate of the fourth transistor receives a second bias signal, and the fourth transistor is configured to control a maximum value of the current flowing through the second resistor to be smaller than the current value of the tail current of the first stage circuit.

11 . The display drive chip according to claim 10 , wherein

in response to the first bias signal causing the third transistor to operate in a linear region, the first output signal decreases and the current flowing through the first resistor increases,

in response to the first output signal being decreased such that the third transistor operates in a saturation region, the current flowing through the first resistor reaches the maximum value,

in response to the second bias signal causing the fourth transistor to operate in the linear region, the second output signal increases and the current flowing through the second resistor increases, and

in response to the second output signal being increased such that the fourth transistor operates in the saturation region, the current flowing through the second resistor reaches the maximum value.

12 . The display drive chip according to claim 11 , wherein the second stage circuit comprises a fifth transistor and a sixth transistor,

a first electrode of the fifth transistor is connected to the power supply voltage, a second electrode of the fifth transistor serves as a first end of the second stage circuit to output the third output signal, and a gate of the fifth transistor serves as a second end of the second stage circuit to receive the first output signal, and

a first electrode of the sixth transistor is connected to the second electrode of the fifth transistor, a second electrode of the sixth transistor is connected to the ground, and a gate of the sixth transistor serves as a third end of the second stage circuit to receive the second output signal, wherein

the fifth transistor and the sixth transistor have different polarities, the fifth transistor and the first transistor have a same polarity, and the sixth transistor and the second transistor have a same polarity.

13 . The display drive chip according to claim 10 , wherein the second stage circuit comprises a fifth transistor and a sixth transistor,

a first electrode of the fifth transistor is connected to the power supply voltage, a second electrode of the fifth transistor serves as a first end of the second stage circuit to output the third output signal, and a gate of the fifth transistor serves as a second end of the second stage circuit to receive the first output signal, and

a first electrode of the sixth transistor is connected to the second electrode of the fifth transistor, a second electrode of the sixth transistor is connected to the ground, and a gate of the sixth transistor serves as a third end of the second stage circuit to receive the second output signal, wherein

the fifth transistor and the sixth transistor have different polarities, the fifth transistor and the first transistor have a same polarity, and the sixth transistor and the second transistor have a same polarity.

14 . The display drive chip according to claim 9 , wherein the second stage circuit comprises a fifth transistor and a sixth transistor,

a first electrode of the fifth transistor is connected to the power supply voltage, a second electrode of the fifth transistor serves as a first end of the second stage circuit to output the third output signal, and a gate of the fifth transistor serves as a second end of the second stage circuit to receive the first output signal, and

a first electrode of the sixth transistor is connected to the second electrode of the fifth transistor, a second electrode of the sixth transistor is connected to the ground, and a gate of the sixth transistor serves as a third end of the second stage circuit to receive the second output signal, wherein

the fifth transistor and the sixth transistor have different polarities, the fifth transistor and the first transistor have a same polarity, and the sixth transistor and the second transistor have a same polarity.

15 . A display apparatus, comprising a display drive chip, the display drive chip comprising a plurality of display units and a drive circuit connected to the plurality of display units, the drive circuit comprising a first stage circuit, a second stage circuit, and an auxiliary circuit, wherein:

the first stage circuit is configured to receive a first input signal and a second input signal, and amplify the first input signal and the second input signal to acquire a first output signal and a second output signal and output the first output signal and the second output signal to the second stage circuit,

the second stage circuit is configured to output a third output signal based on the first output signal and the second output signal to drive a load, and the second stage circuit is connected to the first stage circuit via a Miller capacitor, and

the auxiliary circuit is connected to the first stage circuit and the second stage circuit for reducing an output impedance of the first stage circuit,

the auxiliary circuit comprises a first resistor and a second resistor, the first output signal is output by a first end of the first stage circuit, and the second output signal is output by a second end of the first stage circuit,

the first resistor is connected between a power supply voltage and the first end of the first stage circuit, and

the second resistor is connected between the second end of the first stage circuit and a ground.

16 . The display apparatus according to claim 15 , wherein at least one of the plurality of display units comprises a display panel, and the display panel comprises at least one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel, or a small pitch display panel.

17 . An electronic apparatus, comprising a display apparatus, the display apparatus comprising a display drive chip, the display drive chip comprising a plurality of display units and a drive circuit connected to the plurality of display units, the drive circuit comprising a first stage circuit, a second stage circuit, and an auxiliary circuit, wherein:

the first stage circuit is configured to receive a first input signal and a second input signal, and amplify the first input signal and the second input signal to acquire a first output signal and a second output signal and output the first output signal and the second output signal to the second stage circuit,

the second stage circuit is configured to output a third output signal based on the first output signal and the second output signal to drive a load, and the second stage circuit is connected to the first stage circuit via a Miller capacitor, and

the auxiliary circuit is connected to the first stage circuit and the second stage circuit for reducing an output impedance of the first stage circuit,

the auxiliary circuit comprises a first resistor and a second resistor, the first output signal is output by a first end of the first stage circuit, and the second output signal is output by a second end of the first stage circuit,

the first resistor is connected between a power supply voltage and the first end of the first stage circuit, and

the second resistor is connected between the second end of the first stage circuit and a ground.

18 . The electronic apparatus according to claim 17 , wherein at least one of the plurality of display units comprises a display panel, and the display panel comprises at least one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel, or a small pitch display panel.