Display panel and manufacturing method of display panel

The invention provides a display panel capable of suppressing insulation breakdown in a manufacturing process and a manufacturing method of the display panel. The display panel includes a protection element and a display unit including a plurality of pixels. The display panel includes an insulating substrate, a lower metal layer, a first interlayer insulating film disposed above the lower metal layer, a semiconductor layer disposed above the first interlayer insulating film, a gate insulating film disposed above the semiconductor layer, and a gate metal layer disposed above the gate insulating film. A second interlayer insulating film disposed over the gate metal layer, and a source/drain metal layer disposed over the second interlayer insulating film, each of the plurality of pixels having a thin film transistor including a portion of each of the semiconductor layer, the gate metal layer, and the source/drain metal layer; the protection element has a thin film transistor type diode including the other portio