Shift register useful as a select line scanner for a liquid crystal display.

摘要

A select line scanner for a liquid crystal display includes a plurality of cascaded stages each having an input terminal and an output terminal. Each stage includes a clocked output circuit including serially connected pull up and pull down transistors. A further transistor has its conduction path coupled between the control electrode of the pull up transistor and a point of potential of sufficient value to turn the pull up transistor off. The control electrode of the further transistor is coupled to an output of a succeeding one of the cascaded stages or, alternatively to a source of clocking signals of a phase differing from the clock phase applied to said output circuit, to insure that the output of the respective stage cannot drift to an on state. <IMAGE>