Patent ID: 11875713
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 12:
13. A driver circuit of a display apparatus, the driver circuit comprising a power supply circuit, a timing controller, and an overcurrent protection circuit; wherein
the overcurrent protection circuit is configured to continuously detect a plurality of gate input signals input to a gate driver circuit, and the overcurrent protection circuit includes:
a sampling sub-circuit configured to: acquire the plurality of gate input signals; select a gate input signal with a voltage value greater than a first preset voltage value in the plurality of gate input signals as a sample gate input signal; and generate a first control signal according to the sample gate input signal, and output the first control signal, wherein the first preset voltage value is a critical voltage value at which a transition between a normal state and an overcurrent state of a voltage of a gate input signal occurs;
a delay determination sub-circuit coupled to the sampling sub-circuit, the delay determination sub-circuit being configured to: receive the first control signal output by the sampling sub-circuit delay the first control signal for a first preset time; determine whether a voltage value of the first control signal after delay is less than a voltage value of the first control signal before the delay; and if the voltage value of the first control signal after the delay is not less than the voltage value of the first control signal before the delay, output a counting signal; and
a counting control sub-circuit coupled to the delay determination sub-circuit, the counting control sub-circuit being configured to: receive the counting signal output by the delay determination sub-circuit perform counting according to the counting signal; and if a counted number reaches a preset number, output a second control signal, the second control signal being used for cutting off of inputting of a signal from a system board of a display apparatus to a driver circuit of the display apparatus;

the power supply circuit is coupled to the system board of the display apparatus, the timing controller and the overcurrent protection circuit, and the power supply circuit is configured to receive a power supply signal output by the system board, and supply power to the timing controller and the overcurrent protection circuit according to the power supply signal;
the timing controller is further coupled to the system board, and the timing controller is configured to receive a display signal output by the system board, and generate the plurality of gate input signals for input to the gate driver circuit of the display apparatus according to the display signal;
the overcurrent protection circuit is further coupled to the timing controller; and
the power supply circuit is further configured to receive the second control signal output by the overcurrent protection circuit, and stop receiving the power supply signal output by the system board under control of the second control signal.