An array substrate and a display device are disclosed. The array substrate comprises a backlight source for emitting light; a substrate including a reflection region configured to reflect an external light and a transmission region configured to transmit a light emitted by the backlight source; and a photoelectric conversion device disposed on the substrate and configured to convert optical energy of the light emitted to the reflection region into electric energy. Energy of the light incident on a reflection region of a transflective liquid display device is recycled, thereby avoiding wasting part of energy from the backlight source. Meanwhile, the display device comprises the above mentioned array substrate. This display device is in particular used in smart mobile terminal equipments such as smart watch and the likes.