Display device and system

An electronic device comprising:

• a first housing;
• a second housing;
• a third housing;
• and
• a display portion,
• wherein the display portion overlaps with the first housing, the second housing, and the third housing,
• wherein the display portion is folded in three,
• wherein the display portion comprises:
• a first substrate;
• a first pixel electrode over the first substrate;
• a second pixel electrode over the first substrate;
• a light-emitting layer over the first pixel electrode;
• an active layer over the second pixel electrode;
• a common layer over the light-emitting layer and the active layer;
• a common electrode over the common layer;
• and
• a light guide plate,
• wherein the first pixel electrode, the light-emitting layer, the common layer, and the common electrode overlap with each other in a light-emitting element,
• wherein the second pixel electrode, the active layer, the common layer, and the common electrode overlap with each other in a light-receiving element,
• wherein the light guide plate and the light-emitting element overlap with each other,
• wherein the light guide plate and the light-receiving element overlap with each other,
• wherein the light-emitting element emits first light to an outside through the light guide plate,
• wherein second light is configured to diffuse inside the light guide plate,
• wherein the light-receiving element is configured to receive the first light,
• wherein the light-receiving element is configured to receive the second light,
• wherein the first light comprises visible light, and
• wherein the second light comprises infrared light.