ELECTRONIC DEVICE HAVING A PHOTODIODE AND CAPABLE OF SWITCHING BETWEEN LIGHT-SENSING FUNCTION AND LIGHT-CHARGING FUNCTION

An electronic device includes a photodiode, a switching circuit, a readout circuit, and an energy storage device. The photodiode includes a first terminal and a second terminal and is configured to generate a signal according to a light. The switching circuit is electrically connected to the first terminal and the second terminal. When the electronic device operates in a sensing mode, the switching circuit electrically isolates the photodiode from the energy storage device so that the signal is provided to the readout circuit. When the electronic device operates in a charging mode, the switching circuit electrically connects the photodiode to the energy storage device so that the signal is provided to the energy storage device.