A device for controlling a light emission of a rear light of a vehicle, the rear light comprising optical components having emitting surfaces with at least three partial emitting surfaces, and at least a first and a second light function being generated by the light emission of the emitting surfaces, the device comprising a control device via which the light emission by the partial emitting surfaces are controllable, the optical components being controlled by the control device such that after a switchover process from the first to the second light function, a first partial emitting surface, which emits light for the first light function, no longer emits light, a second partial emitting surface, which emits light for the first light function, continues to emit light, and a third partial emitting surface, which does not emit light for the first light function, emits light,
- wherein the first light function is a taillight function and the second light function is a braking light function.