Patent ID: 8415746

Claim:
An MOS-bipolar hybrid thin-film transistor, comprising: a substrate formed of glass or plastic; a semiconductor thin film which is provided on the substrate and includes at least one crystallized region which is crystallized in a predetermined direction; a bipolar thin-film transistor including an emitter region, a base region and a collector region which are formed in the crystallized region of the semiconductor thin film, and a gate electrode arranged in the predetermined direction; an MOS thin-film transistor including a source region formed by the emitter region, a channel region formed by the base region, and a drain region formed by the collector region which are formed in the semiconductor thin film, and a gate electrode formed over a channel in the channel region; and a lead-out electrode connected to the base region, wherein the gate electrode of the bipolar thin-film transistor is formed on the base region via an insulation film, the lead-out electrode and the gate electrode of the bipolar thin-film transistor are electrically connected to have an equal potential, the MOS-bipolar hybrid thin-film transistor has both a function of the bipolar thin-film transistor and a function of the MOS thin-film transistor, and a flowing direction of current in the bipolar thin-film transistor, a flowing direction of current in the MOS thin-film transistor, and said predetermined direction are the same.