Importance

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Abstract

At least one embodiment the present invention a plurality of unit circuits connected in multiple stages, to normal operation when the unit circuits are simultaneously turned on to output high-level output signals. When a shift register malfunctions, so that output signals provided by previous- and subsequent-stage unit circuits are simultaneously set to high level, malfunction restoration circuits and included in a unit circuit detect the malfunction in at least one embodiment. The malfunction restoration circuit provides a high voltage to a node, thereby forcibly pulling down an output signal. Also, the malfunction restoration circuit forcibly discharges another node, so that a charge accumulated in a capacitance is released. As a result, the shift register in malfunction can be instantaneously restored to normal operation. At least one embodiment of the present invention is suitable for driver circuits or suchlike of display devices and imaging devices.

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First Claim