Display device and manufacturing method thereof

A manufacturing method of a display device, comprising:

• forming a pixel circuit on a base substrate, wherein
• the pixel circuit comprises a driving transistor, a first transistor, and a second transistor;
• the driving transistor comprises a control electrode, a first electrode, and a second electrode, and is configured to control a driving current, flowing through the first electrode of the driving transistor and the second electrode of the driving transistor, for driving a light-emitting element to emit light according to a voltage of the control electrode of the driving transistor;
• the first transistor is connected to the control electrode of the driving transistor, and is configured to write a data signal to the control electrode of the driving transistor in response to a first scan signal;
• the second transistor is connected to the control electrode of the driving transistor, and is configured to write the data signal to the control electrode of the driving transistor in response to a second scan signal;
• the first transistor comprises a first active region, the second transistor comprises a second active region, the driving transistor comprises a fourth active region;
• and
• the pixel circuit further comprises a third transistor, and the third transistor is connected to the first electrode of the driving transistor, and is configured to apply a first power supply voltage to the first electrode of the driving transistor in response to a light-emitting control signal;
• and the third transistor comprises a third active region, and the manufacturing method further comprises doping the first active region, the second active region, the third active region and the fourth active region so that both of a doping concentration of the first active region and a doping concentration of the second active region are larger than-both a doping concentration of the third active region and a doping concentration of the fourth active region.