Abstract: An organic light-emitting transistor may include a mesh-type source electrode having a plurality of apertures in an array pattern. The mesh-type source electrode may be located between the gate electrode and the drain electrode. The organic light-emitting transistor adopting a mesh-type source electrode may show quasi-surface emission characteristics similar to that of the organic light-emitting diode. Moreover, an aperture ratio, brightness, and light emission efficiency of the organic light-emitting transistor may be superior to those of an organic light-emitting diode. Another advantage is that the production cost may be reduced since an additional driving element such as a thin-film-transistor is not needed.