Overcurrent protection circuit, display panel, and display device

A display panel, comprising a display area and a fan-out area, wherein the fan-out area comprises a gate scan driving circuit installed thereon and electrically coupled to an overcurrent protection circuit, and the overcurrent protection circuit comprising:

• a voltage conversion unit, configured to receive an input voltage and converting the input voltage into a modulated voltage;
• a reference voltage generation unit, configured to generate a reference voltage for comparing the modulated voltage;
• a voltage comparison unit, electrically coupled to the voltage conversion unit and the reference voltage generation unit, and configured to compare the modulated voltage with the reference voltage, so as to generate a corresponding control signal;
• and a switch unit, electrically coupled to the voltage comparison unit and the voltage conversion unit, and configured to determine whether or not to output the modulated voltage according to the control signal;
• wherein an output power of the voltage conversion unit is constant;
• wherein the switch unit comprises:
• a switch input terminal, electrically coupled to the voltage conversion unit, configured to receive the modulated voltage;
• a switch output terminal, configured to output the modulated voltage;
• a switch control terminal, electrically coupled to the voltage comparison unit, configured to receive the control signal and confirming a switch status of the switch unit according to the control signal, wherein the switch status includes a conduction status and a cut-off status;
• wherein the overcurrent protection circuit further comprises a feedback unit electrically coupled to the voltage conversion unit and the switch unit wherein the feedback unit obtains a feedback voltage value of the switch output terminal and feeds back the feedback voltage value to the voltage conversion unit, and the voltage conversion unit determines whether or not the feedback voltage value falls within a predetermined range and stops outputting the modulated voltage when the feedback voltage value is within the predetermined range.

A display device, comprising a housing and a display panel fixed into the housing, wherein the display panel comprises a display area and a fan-out area, and the fan-out area having a gate scan driving circuit installed thereon and an overcurrent protection circuit electrically coupled the gate scan driving circuit, and the overcurrent protection circuit comprising:

• a voltage conversion unit, configured to receive an input voltage and converting the input voltage into a modulated voltage;
• a reference voltage generation unit, configured to generate a reference voltage for comparing the modulated voltage;
• a voltage comparison unit, electrically coupled to the voltage conversion unit and the reference voltage generation unit, configured to compare the modulated voltage with the reference voltage, so as to generate a corresponding control signal;
• and a switch unit, electrically coupled to the voltage comparison unit and the voltage conversion unit, configured to determine whether or not to output the modulated voltage according to the control signal;
• wherein an output power of the voltage conversion unit is constant;
• wherein the switch unit comprises:
• a switch input terminal, electrically coupled to the voltage conversion unit, configured to receive the modulated voltage;
• a switch output terminal, configured to output the modulated voltage;
• a switch control terminal, electrically coupled to the voltage comparison unit, configured to receive the control signal and confirming a switch status of the switch unit according to the control signal, wherein the switch status includes a conduction status and a cut-off status;
• wherein the overcurrent protection circuit further comprises a feedback unit electrically coupled to the voltage conversion unit and the switch unit wherein the feedback unit obtains a feedback voltage value of the switch output terminal and feeds back the feedback voltage value to the voltage conversion unit, and the voltage conversion unit determines whether or not the feedback voltage value falls within a predetermined range and stops outputting the modulated voltage when the feedback voltage value is within the predetermined range.