US Patent 11764311 Optical device and electronic device

An optical device includes a first circuit layer, a light detector, a first conductive pillar and an encapsulant. The first circuit layer has an interconnection layer and a dielectric layer. The light detector is disposed on the first circuit layer. The light detector has a light detecting area facing away from the first circuit layer and a backside surface facing the first circuit layer. The first conductive pillar is disposed on the first circuit layer and spaced apart from the light detector. The first conductive pillar is electrically connected to the interconnection layer of the first circuit layer. The encapsulant is disposed on the first circuit layer and covers the light detector and the first conductive pillar. The light detector is electrically connected to the interconnection layer of the first circuit layer through the first conductive pillar. The backside surface of the light detector is exposed from the encapsulant.