Display panel driving circuit and display panel

A display panel driving circuit, comprising:

• a driving circuit and a light-emitting diode, the driving circuit connected to the light-emitting diode,
• wherein the driving circuit comprises a plurality of superimposed driving modules, and a corresponding number of driving modules are selectively conducted according to a preset grayscale,
• wherein each driving module comprises a scan control transistor, a switch transistor and a drive transistor, in each driving module the scan control transistor is connected to the drive transistor via the switch transistor, in each driving module a first end of the scan control transistor is connected to a scan signal terminal, and the light-emitting diode and the drive transistors of the driving modules are sequentially connected,
• wherein in each driving module a second end of the scan control transistor is connected to the first end of the switch transistor, third ends of the scan control transistors of the driving modules are connected to different data signal terminals, in each driving module the second end of the switch transistor is connected to the third end of a corresponding drive transistor, and in each driving module the third end of the switch transistor is connected to a grounded terminal;
• and
• wherein the first ends of the drive transistors of the driving modules are connected to different chip select signal terminals, the second end of the drive transistor of a later driving module is connected to the third end of the drive transistor of a previous driving module, the second end of the drive transistor of the driving module located closest to the light-emitting diode is connected to a cathode of the light-emitting diode, an anode of the light-emitting diode is connected to a power voltage input terminal, and the drive transistors are selectively switched on by chip select signals inputted via the chip select signal terminals for adjusting an electric current passing through the light-emitting diode.