Over-temperature protection circuitry and driving method

An over-temperature protection circuitry, comprising:

• a source circuit, a comparator circuit and an output circuit,
• wherein the comparator circuit comprises a thermistor, a first resistor and a comparator, the source circuit is connected to a first input terminal of the comparator circuit via the thermistor and is connected to a second input terminal of the comparator circuit via the first resistor, and an output terminal of the comparator circuit is connected to an input terminal of the output circuit;
• and
• wherein:
• the source circuit is configured to output a first constant excitation signal to the thermistor and output a second constant excitation signal to the first resistor, and the thermistor has a different degree of sensitivity to temperature from the first resistor;
• the comparator circuit is configured to compare a first signal from the first input terminal of the comparator circuit with a second signal from the second input terminal of the comparator circuit, and output a control signal according to a comparison result, wherein the first signal is associated with the thermistor and the first constant excitation signal, the second signal is associated with the first resistor and the second constant excitation signal, and the control signal is an over-temperature control signal in the case that the comparison result indicates that the temperature is greater than or equal to a protection threshold;
• and
• the output circuit is configured to output a disenabling signal in the cast that the comparator circuit outputs the over-temperature control signal.