The disclosure provides a display panel, a method for preparing the display panel, and a display device. The display panel includes: a driving backplane, wherein the driving backplane comprises a display area, the display area is provided with a heterotypic edge, and the display area comprises a plurality of first pixel opening areas and a plurality of second pixel opening areas; wherein the plurality of first pixel opening areas are close to the heterotypic edge, and the plurality of second pixel opening areas are away from the heterotypic edge; and a light emitting structure, wherein the light emitting structure is arranged on the driving backplane and comprises a first functional layer, wherein each of the second pixel opening areas is completely covered by the first functional layer, and each of the first pixel opening areas is partially covered by the first functional layer.