Abstract
The present invention discloses a physiological signal sensing device. The physiological signal sensing device includes a substrate, a first light-emitting diode, a second first light-emitting diode, a sensing array and a processing unit. The substrate includes a touch surface for contacted with a finger. The first and second light-emitting diodes respectively emit red light and infrared light to the finger through the touch surface. The sensing array senses, according to a first sensing period, the red light or the infrared light reflected or refracted from the finger to obtain a first physiological sensing signal. The sensing array senses, according to a second sensing period, the red light and the infrared light reflected or refracted from the finger to obtain a second physiological sensing signal. The first sensing period is shorter than the second sensing period. The processing unit operates the sensing array according to the first and second sensing periods. The processing unit respectively processes the first and second physiological sensing signal to obtain space information and energy information of the finger.