Abstract: A sensing system including a substrate, at least one explicit device, at least one inner operation device, a plurality of conductors, and a plurality of conductive traces is provided. The substrate has a first surface and a second surface opposite to the first surface, and has a plurality of vias communicating the first surface and the second surface. The explicit device is disposed on the first surface. The explicit device includes a display, a sensor, or a combination thereof. The inner operation device is totally disposed on the second surface. The inner operation device includes a signal processor, a driver, or a combination thereof. The conductors are disposed in the vias, respectively, and connect the at least one explicit device with the at least one inner operation device. The conductive traces are disposed on at least one of the first surface and the second surface.