Mask plate, display panel and display device

A display panel, comprising:

• a substrate;
• a driving function film layer, the driving function film layer being disposed on the substrate;
• a planarization layer, the planarization layer being disposed on a side of the driving function film layer away from the substrate, the planarization layer being provided with a plurality of via holes, the plurality of via holes exposing a plurality of source/drain layers arranged at intervals in the driving function film layer, the plurality of via holes being formed by etching, and sidewalls of at least some of the plurality of via holes being sloped with respect to the plurality of source/drain layers;
• and
• a display function film layer, the display function film layer being disposed on a side of the planarization layer away from the substrate, a partial region of a first metal electrode layer of each sub-pixel in the display function film layer being disposed in a corresponding via hole to connect the first metal electrode layer to a respective source/drain layer of the plurality of source/drain layers that is exposed by the corresponding via hole,
• wherein the plurality of via holes comprises a first via hole and a second via hole, and
• wherein an angle between an edge of the planarization layer that forms the first via hole and the source/drain layer that is exposed by the first via hole is smaller than an angle between an edge of the planarization layer that forms the second via hole and the source/drain layer that is exposed by the second via hole.