Display panel and manufacturing method thereof, display device

A manufacturing method of a display panel, comprising:

• providing the display panel, the display panel comprising a display area, an opening area, and an isolation area between the display area and the opening area, the isolation area at least partially being arranged around the opening area;
• providing a base substrate;
• forming a driving circuit layer and a first isolation column on the base substrate;
• in which
• the driving circuit layer comprises a thin film transistor and a storage capacitor in the display area, the thin film transistor comprises a gate electrode, a first gate insulating layer formed at a side of the gate electrode away from the base substrate, an interlayer dielectric layer formed at a side of the first gate insulating layer away from the base substrate, and source and drain electrodes formed at a side of the interlayer dielectric layer away from the base substrate;
• the storage capacitor comprises a first electrode plate arranged on the same layer as the gate electrode and a second electrode plate positioned between the first gate insulating layer and the interlayer dielectric layer;
• the first isolation column is arranged around the opening area and comprises a first metal layer, a first insulating layer formed at a side of the first metal layer away from the base substrate, a second insulating layer formed at a side of the first insulating layer away from the base substrate, and a second metal layer formed at a side of the second insulating layer away from the base substrate;
• wherein the first metal layer is arranged on the same layer as the first electrode plate or the second electrode plate;
• the first insulating layer is arranged on the same layer as the first gate insulating layer;
• the second insulating layer is arranged on the same layer as the interlayer dielectric layer, and comprises a first portion, a second portion and a first inclined portion connecting the first portion and the second portion, a slope angle of the first inclined portion is less than 90°;
• the second metal layer is arranged on the same layer as the source and drain electrodes and is located at a side of the second portion away from the base substrate, and a notch surrounding the opening area is arranged at a side facing towards the display area and/or at a side facing towards the opening area.