Abstract: An output-buffer circuit includes a first output transistor connected between a first power line and an output node, a second output transistor connected between the output node and a second power line, an output-transistor control circuit which controls an on/off state of the first and second output transistors, and a capacitor for controlling a through-rate of an output signal output to the output node, wherein the output-transistor circuit includes a pull-up circuit connected between the first power line and a given node, a pull-down circuit connected between the given node and the second power line, a first switch device connected between a gate of the first output transistor and the given node, a second switch device connected between the first power line and the gate of the first output transistor, a third switch device connected between a gate of the second output transistor and the given node, and a fourth switch device connected between the gate of the second output transistor and the second power li

Abstract: A liquid crystal electro-optical device has electrodes, a pair of substrates at least one of which is transparent, thin-film transistors provided on one of the pair of substrates, and a ferroelectric or antiferroelectric liquid crystal material, or a ferroelectric or antiferroelectric liquid crystal material mixed with a polymer compound held between the pair of substrates. A particular relationship is established between spontaneous polarization of the liquid crystal material, a capacitance between pixel electrodes, a pulse voltage applied to gates of the transistors, a time constant of a pixel, a residual pixel voltage immediately before application of the next pulse, and other parameters.