Display Device and Electronic Device

A display device comprising a first substrate, a light guide plate, a plurality of first light-emitting elements, a second light-emitting element, and a plurality of light-receiving elements,

• wherein the light guide plate comprises a first portion having a first surface and a second portion having a second surface that connects with the first surface and has a different normal direction from the first surface,
• wherein an area of the second surface is smaller than an area of the first surface,
• wherein the first substrate comprises a third portion provided along the first portion of the light guide plate and a fourth portion provided along the second portion,
• wherein the first light-emitting elements and the light-receiving elements are provided between the first substrate and the light guide plate,
• wherein the first light-emitting elements emit first light through the light guide plate,
• wherein the second light-emitting element emits second light to a side surface of the light guide plate,
• wherein the light-receiving elements receive the second light and converting the second light to an electric signal,
• wherein the first light includes visible light, and
• wherein the second light includes infrared light.