Patent ID: 11948511
Assignee: HKC CORPORATION LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A pixel driving circuit, comprising: a switching transistor, an energy storage capacitor, and a driving transistor,
wherein a first pole of the switching transistor is configured to allow a data voltage to be input to the switching transistor, a second pole of the switching transistor is connected to the energy storage capacitor; a first pole of the driving transistor is configured to allow a power supply voltage to be input to the driving transistor, a second pole of the driving transistor is connected to a light-emitting unit, a control pole of the driving transistor is connected to the energy storage capacitor; and when the energy storage capacitor discharges to the control pole of the driving transistor, the driving transistor outputs a driving current to the light-emitting unit;
the pixel driving circuit further comprises a control module;
wherein the control module is connected in series with the driving transistor, the control module has a detection end, the detection end of the control module is connected to the light-emitting unit to detect a value of the driving current; and
when the value of the driving current exceeds a preset current range, the control module is disconnected to allow the driving transistor to stop outputting the driving current to the light-emitting unit;
the control module comprises: a sampling resistor, a switching unit, and a first voltage comparison unit;
wherein the sampling resistor is connected in parallel with the light-emitting unit;
a first end of the switching unit is configured to allow the power supply voltage to be input to the switching unit, and a second end of the switching unit is connected to the first pole of the driving transistor; and
a first input end of the first voltage comparison unit is connected to the light-emitting unit, a second input end of the first voltage comparison unit is configured to allow a reference voltage to be input to the first voltage comparison unit, an output end of the first voltage comparison unit is connected to a control end of the switching unit when a voltage of the light-emitting unit is greater than the reference voltage, the first voltage comparison unit outputs a high voltage level signal to control the switching unit to be switched off.