Thin film boot strap shift register

A thin film integrated circuit comprising:

• a plurality of circuits constituted of thin film elements provided on an insulative substrate;
• a shift register constituted of thin film transistors, taking said plurality of circuits as loads, respectively and sequentially and alternately driving said loads depending upon input of a start pulse, said shift register including
• a plurality of signal transfer circuits connected in tandem and transferring a signal applied to a signal input point to a signal output point with a shift pulse and driving said loads by output signals thereof,
• a driving circuit applying mutually opposite phases of shift pulses to said plurality of signal transfer circuit for driving said load with parallel output signals thus obtained;
• said individual signal transfer circuit including
• an input transistor taking a gate electrode as a signal input point;
• a driving transistor having a gate electrode connected to primary electrodes of said input transistor, taking said primary electrode as a signal output point, to which said load is connected;
• a signal transfer portion transferring a pulse signal input to said signal input point to said signal output point by a dynamic action with a boot strap effect on the basis of charge accumulation effect of a capacitance associated with the gate electrode of said driving transistor and application of a shift pulse to the other primary electrode of said driving transistor;
• and
• a resetting portion including a resetting transistor having one primary electrode connected to the gate electrode of said driving transistor and maintaining a shut-off condition while said driving transistor is in shut-off condition, and a gate voltage control means for providing a gate voltage including a voltage of negative polarity to a gate electrode of said resetting transistor.