A semiconductor package device comprises a substrate, a light emitter, a light detector and a transparent conductive film. The substrate as a first surface and a second surface opposite to the first surface. The light emitter is disposed on the first surface of the substrate and has a light emission area adjacent to the first surface of the substrate. The light detector is disposed on the first surface of the substrate and has a light receiving area adjacent to the first surface of the substrate. The transparent conducting film is disposed on the second surface of the substrate.