Abstract: A semiconductor device having its carrier-injecting region formed with a Schottky structure, and arranged so that the current flowing through the Schottky barrier by virtue of tunnel effect is controlled by a controlling electrode to thereby control the drain or collector or anode current. Thus, this device has a large current density and a large current gain. This device can be used not only as a discrete one, but also it is quite suitable when applied to integrated circuits.

Abstract: A light-responsive light-emitting diode display comprises a light-emitting diode circuit including a series connection of light-emitting diodes and a light-responsive current-controlling circuit connected in series to said light-emitting diode circuit for supplying a current thereto in correspondence with the ambient brightness. A unipolar photo-transistor can provide a current above a predetermined minimum value and increasing with the intensity of incident lights and can absorb excess voltages when applied. Light-responsive current-control reduces the useless power dissipation, and all solid-state display provides a very long service life.