| CPC H05K 1/02 (2013.01) [H05K 3/285 (2013.01); H05K 2201/02 (2013.01)] | 7 Claims |

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1. An electronic device, comprising:
a substrate, having a first surface, a second surface, and a side surface connected between the first surface and the second surface;
a side wiring, disposed on the substrate and extending from the first surface to the second surface through the side surface;
a protective film, disposed on the side wiring, wherein the side wiring is sandwiched between the substrate and the protective film, an edge of the protective film extends beyond a side wall of the side wiring, and the protective film, the side wall of the side wiring, and the substrate define a gap; and
a first filler, disposed on the protective film and in the gap, wherein the first filler comprises a first material and a plurality of particles mixed within the first material.
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