Provided are a sensor, a display panel and an electronic device. The sensor includes a flexible substrate, a plurality of sensing units disposed on a first side of the flexible substrate, and at least one inorganic blocky structure and at least one organic layer which are disposed on the first side of the flexible substrate, where each of the plurality of sensing units is disposed corresponding to a respective one of the at least one blocky structure, and a vertical projection of at least part of the respective one of the at least one blocky structure on a plane where the flexible substrate is located overlaps with the corresponding one of the plurality of sensing units, and where the at least one organic layer is filled adjacent blocky structures.