A display screen includes a display panel, a back light system, and an optical device concealed under the display panel, where a transmission light path formed by light rays received or transmitted by the optical device passes through the display screen. The display screen includes the fill-in light system, where the fill-in light system is disposed between the back light system and the optical device. The fill-in light system includes a first light source and a light guide member configured to transmit a light ray emitted by the first light source.