Array substrate, fabrication method thereof and display device

A display device, comprising an array substrate, wherein the array substrate comprises:

• a pixel driving circuit, comprising a driving transistor, a first transistor, a capacitor, and a second transistor, wherein a first electrode of the first transistor is connected to a gate electrode of the driving transistor, and a first electrode of the capacitor is connected to the gate electrode of the driving transistor;
• a base substrate;
• a first conductive layer, laminated at a side of the base substrate, and comprising a first conductive portion, wherein the first conductive portion is configured as the gate electrode of the driving transistor and the first electrode of the capacitor;
• a first dielectric layer, laminated at a side of the first conductive layer away from the base substrate;
• and
• a second conductive layer, laminated at a side of the first dielectric layer away from the base substrate, and comprising:
• a second conductive portion, configured as a gate electrode of the first transistor;
• and
• a fourth gate line, electrically connected to the gate electrode of the first transistor;
• and
• a data line, wherein the second transistor is configured to transmit a data signal on the data line to the driving transistor;
• wherein
• the first conductive layer further comprises a first gate line, wherein the first gate line is electrically connected to a gate electrode of the second transistor;
• and
• an orthographic projection of the first gate line on the base substrate is located between an orthographic projection of the fourth gate line on the base substrate and an orthographic projection of the first conductive portion on the base substrate.