Patent ID: 8159484
Filing Date: 2012-04-17
Classification: G09G

Abstract:
1. A liquid crystal device having a plurality of pixel circuits, comprising: a lateral electric field mode liquid crystal element that controls alignment of liquid crystal molecules by applying an electric field in a direction of a substrate plane to a liquid crystal layer, and that includes a first pixel electrode and a second pixel electrode; a memory circuit that is provided in each of the plurality of pixel circuits and that functions as a source to supply a first voltage and a second voltage; a voltage inverter circuit that is provided in each of the plurality of pixel circuits, and that inverts a voltage applied to the liquid crystal element by switching the supply of each of the first and second voltages, supplied from the memory circuit, between the first pixel electrode and the second pixel electrode of the liquid crystal element; and a holding capacitor that holds a voltage applied to the liquid crystal element, wherein the voltage inverter circuit includes a first switching element and a second switching element that are connected in series between an end of the memory circuit, from which the first and second voltages are supplied, and a reference power supply electric potential, wherein the voltage inverter circuit further includes a third switching element and a fourth switching element that are connected in series between the end of the memory circuit, from which the first and second voltages are supplied, and the reference power supply electric potential, wherein one end of the holding capacitor is connected to at least one of a common connecting point of the first and second switching elements and a connecting point of the third and fourth switching elements, wherein the first pixel electrode and the second pixel electrode of the liquid crystal element are respectively connected to the common connecting point of the first and second switching elements and the common connecting point of the third and fourth switching elements, and wherein whether to selectively turn on the first and fourth switching elements, to selectively turn on the second and third switching elements, or to turn off all the first to fourth switching elements, are controlled by switch control signals.