Patent ID: 6937687

Claim:
A bi-directional shift controller comprising: a first control line with a first voltage; a second control line with a second voltage; a plurality of transistors serially connected between said first control line and a third voltage, wherein a source terminal of a first transistor is electrically connected to said first control line and a drain terminal of said first transistor is electrically connected to a second transistor, and a source terminal of a third transistor is connected to said third voltage; a fourth transistor connected between said second control line and an input terminal of a shift register stage, the drain terminal of said first transistor further electrically connected to said input terminal of said shift register stage; means to apply a first output voltage from previous shift register stage concurrently to gate terminals of each of said first and third transistors; and means to apply a second output voltage from next shift register stage concurrently to gate terminals of each of said second and fourth transistors.