OLED print head

An organic light-emitting diode (OLED) print head, comprising:

• a control unit, configured to output a start signal and a brightness signal;
• and
• a plurality of lighting units, coupled to the control unit, each lighting unit comprising:
• a shift register, each shift register comprising a shift input terminal, an actuation output terminal, and a shift output terminal, and the shift registers being connected in series so that a shift output terminal of a previous stage's shift register is coupled to a shift input terminal of a subsequent stage's shift register, wherein a shift input terminal of a first stage's shift register receives and shifts the start signal, so as to output a scanning signal having a trigger pulse wave through the shift output terminal, and the other shift registers each receives and shifts the scanning signal outputted by the shift output terminal of the previous stage's shift register, so as to output the scanning signal having the trigger pulse wave through the shift output terminal, the actuation output terminal of each shift register outputs an actuation output signal, and the actuation output signal has an actuation pulse wave corresponding to a time point of the trigger pulse wave;
• a driving circuit, comprising a driving capacitor, a first switch, and a second switch, and configured to store a brightness voltage corresponding to the brightness signal in the driving capacitor in response to the trigger pulse wave of the scanning signal, wherein the first switch is controlled by the brightness voltage, and the second switch is controlled by the actuation output signal;
• and
• an OLED, coupled to the first switch, wherein the first switch and the second switch are located on a driving path of the OLED, an upstream end of the driving path has a working voltage, and the OLED obtains, via the driving path, a driving current related to the brightness voltage when both the first switch and the second switch are turned on.