Surface light-emitting device, display device, and illumination device

A surface light-emitting device comprising:

• a plurality of light sources;
• a light guide that guides light emitted from the plurality of light sources;
• and
• a controller that controls turn-on operations of the plurality of light sources,
• wherein
• the light guide includes
• a plurality of light controllers on which the light from the plurality of light sources are incident,
• prism that reflects the light having passed through the plurality of light controllers,
• a light guide surface on which the prism is provided, and
• an emission surface that is disposed opposite to the light guide surface and emits the light reflected by the prism,
• the plurality of light controllers are disposed side by side in a first direction intersecting optical axes of the plurality of light controllers,
• the plurality of light sources include a first light source and a second light source,
• the first light source is disposed on one of the optical axes of the plurality of light controllers,
• the second light source is disposed at a position away from the optical axes of the plurality of light controllers, and
• the controller turns on at least one of the first light source and the second light source.