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

Claim 3:
4. An overcurrent protection circuit, configured to continuously detect a plurality of gate input signals input to a gate driver circuit, the overcurrent protection circuit comprising:
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; wherein
the sampling sub-circuit includes a signal selection unit; and the signal selection unit is configured to receive the plurality of gate input signals, select a gate input signal with a greatest voltage value in the plurality of gate input signals, compare the voltage value of the selected gate input signal with the first preset voltage value, and if the voltage value of the selected gate input signal is greater than the first preset voltage value, use the selected gate input signal as the sample gate input signal.