Peeling method, display device, module, and electronic device

A display device comprising:

• a resin layer comprising an opening;
• an insulating layer over the resin layer and comprising an opening;
• a transistor comprising an oxide semiconductor in a channel formation region over the insulating layer;
• a conductive layer over the insulating layer;
• and
• a display element electrically connected to the transistor,
• wherein the insulating layer covers a periphery of the opening of the resin layer,
• wherein the conductive layer overlaps with the opening of the insulating layer and the opening of the resin layer, and
• wherein at least part of the conductive layer is exposed in the opening of the resin layer.

A display module comprising:

• a circuit board;
• a resin layer comprising an opening;
• an insulating layer over the resin layer and comprising an opening;
• a transistor comprising an oxide semiconductor in a channel formation region over the insulating layer;
• a conductive layer over the insulating layer;
• and
• a display element electrically connected to the transistor,
• wherein the conductive layer overlaps with the opening of the insulating layer and the opening of the resin layer,
• wherein the circuit board overlaps with the conductive layer and the opening of the resin layer, and
• wherein the circuit board is electrically connected to the conductive layer through the opening of the resin layer.