| CPC H05K 3/4688 (2013.01) [H05K 1/0306 (2013.01); H05K 3/386 (2013.01); H05K 3/42 (2013.01); H05K 2201/09045 (2013.01); H05K 2201/20 (2013.01)] | 20 Claims |

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1. An electronic device, comprising:
a first insulating layer having a side surface and at least one recess adjacent to the side surface;
a second insulating layer disposed on the first insulating layer and filled in the at least one recess;
an adhesive layer disposed on the second insulating layer; and
a functional layer disposed on the adhesive layer;
wherein in a cross-sectional view of the electronic device, the second insulating layer has a thickness at a first position, and a thickness of the adhesive layer corresponding to the first position is greater than the thickness of the second insulating layer.
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