Patent ID: 11942020
Assignee: HKC CORPORATION LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 13:
14. A four-stage driving circuit, comprising:
a first driving circuit comprising:
a first input circuit configured to output a first control signal upon receiving a first trigger signal;
a first output circuit comprising a control terminal connected to an output terminal of the first input circuit and configured to output a first output signal upon receiving the first control signal and a first input signal;
a second output circuit comprising a control terminal connected to the output terminal of the first input circuit and configured to output a second output signal upon receiving the first control signal and a second input signal are received; and
a first pull-down circuit comprising:
an input terminal connected to the output terminal of the first input circuit, an output terminal of the first output circuit and an output terminal of the second output circuit; and
an output terminal connected to a first low level voltage, and configured to pull the first control signal, the first output signal and the second output signal to a low level when a first pull-down control signal is at a high level, and stop pulling down the first control signal, the first output signal and the second output signal when the second control signal or the first control signal is at the high level; and

a second driving circuit comprising:
a second input circuit configured to output a second control signal upon receiving a second trigger signal;
a third output circuit comprising a control terminal connected to an output terminal of the second input circuit and configured to output a third output signal upon receiving the second control signal and a third input signal;
a fourth output circuit comprising a control terminal connected to the output terminal of the second input circuit and configured to output a fourth output signal upon receiving the second control signal and a fourth input signal;
a second pull-down circuit comprising:
an input terminal connected to the output terminal of the second input circuit, an output terminal of the third output circuit, and an output terminal of the fourth output circuit; and
an output terminal connected to the first low level voltage, and configured to pull down the second control signal, the third output signal and the fourth output signal to the low level when a second pull-down control signal is at the high level, and stop pulling down the second control signal, the third output signal and the fourth output signal when the first trigger signal, the second control signal or the first control signal is at the high level, the first pull-down control signal and the second pull-down control signal being opposite in voltage level.