Stacked flexible printed circuit board assembly with side connection section

A stacked flexible printed circuit board, comprising:

• a first flexible printed circuit board including a first plugging section and a first extension section extending from the first plugging section in a extension direction, the first plugging section including a first bonding surface and a first exposed surface, the first flexible printed circuit board being delimited with a first outer side edge and a first inner side edge;
• a plurality of first circuit traces, which is arranged in the extension direction on the first extension section of the first flexible printed circuit board;
• a plurality of first contact pads, which are arranged, in a manner of being spaced from each other, on the first plugging section of the first flexible printed circuit board and are located on the first exposed surface and connected to the plurality of first circuit traces;
• a second flexible printed circuit board including a second plugging section and a second extension section extending from the second plugging section in the extension direction, the first extension section of the first flexible printed circuit board and the second extension section of the second flexible printed circuit board being stacked and enclosed with an enclosure protection layer, the second plugging section including a second bonding surface and a second exposed surface, the second plugging section being a plugging terminal section located adjacent to the second flexible printed circuit board, the second flexible printed circuit board being delimited with a second outer side edge and a second inner side edge;
• a plurality of second circuit traces, which are arranged in the extension direction on the second extension section of the second flexible printed circuit board;
• a plurality of second contact pads, which are arranged, in a manner of being spaced from each other, on the second plugging section of the second flexible printed circuit board and are located on the second exposed surface and connected to the plurality of second circuit traces;
• a curved connection section integrally connected to and between the first inner side edge of the first flexible printed circuit board and the second inner side edge of the second flexible printed circuit board, the first bonding surface of the first flexible printed circuit board being folded in a direction toward and stacked on the second bonding surface of the second flexible printed circuit board so that the curved connection section forms a curved continuous surface and the plurality of first contact pads of the first flexible printed circuit board respectively correspond to the plurality of second contact pads of the second flexible printed circuit board;
• and
• an adhesive layer, which is adhesively bonded between the first bonding surface of the first flexible printed circuit board and the second bonding surface of the second flexible printed circuit board.