Mother substrate, method of manufacturing display panel, and method of manufacturing electronic device

A method of manufacturing a display panel, the method comprising:

• providing a preliminary mother substrate comprising:
• a base substrate defined with a target region and a first dummy region surrounding the target region, wherein the target region comprises a plurality of active regions and a second dummy region surrounding the plurality of active regions,
• a plurality of cells disposed on the base substrate,
• a first protective layer, and
• a second protective layer;
• providing a third protective layer having:
• a first adhesion force in an outer region of the third protective layer, and
• a second adhesion force smaller than the first adhesion force in at least a portion of a central region of the third protective layer surrounded by the outer region;
• and
• attaching the third protective layer to the base substrate such that the outer region overlaps the first dummy region and the central region overlaps the target region.

A method of manufacturing an electronic device, the method comprising:

• providing a preliminary mother substrate comprising:
• a base substrate defined with a target region and a first dummy region surrounding the target region, wherein the target region comprises a plurality of active regions and a second dummy region surrounding the plurality of active regions,
• a plurality of cells disposed on the base substrate,
• a first protective layer, and
• a second protective layer overlapping with a cell cut line of the base substrate;
• providing a third protective layer having:
• a first adhesion force in an outer region of the third protective layer, and
• a second adhesion force smaller than the first adhesion force in at least a portion of a central region of the third protective layer surrounded by the outer region;
• attaching the third protective layer to the base substrate such that the outer region overlaps the first dummy region and the central region overlaps the target region;
• spraying an etchant from above the base substrate, wherein spraying the etchant cuts and separates the plurality of cells along the cell cut line;
• and
• connecting the separated plurality of cells with a driving unit.