The present disclosure provides an optical sensing device, including: a storage circuitry being coupled to a charging circuitry, a photosensitive circuitry, and a voltage-readout circuitry, the storage circuitry storing a voltage value; the charging circuitry being coupled to the storage circuitry for charging the storage circuitry; the photosensitive circuitry being connected to a first terminal for discharging the storage circuitry to the first terminal; and the voltage-readout circuitry being connected to the storage circuitry, for reading the voltage value of the storage circuitry.