Patent ID: 8120562

Claim:
A liquid crystal device, comprising: a liquid crystal element having a first pixel electrode and a second pixel electrode which control alignment of liquid crystal molecules by applying an electric field in a direction parallel to a surface of a substrate to a liquid crystal layer; a memory circuit which is disposed in a pixel circuit and which serves as a voltage source of a first voltage and a second voltage; an application voltage inverting circuit which is disposed in the pixel circuit and which inverts voltages applied to the liquid crystal element by controlling each of the first voltage and the second voltage so as to be supplied to either the first pixel electrode or the second pixel electrode of the liquid crystal element; wherein the application voltage inverting circuit includes: a first switching element and a second switching element connected in series between a voltage supply terminal of the first voltage and the second voltage of the memory circuit and a reference power source potential, a third switching element and a fourth switching element connected in series between the voltage supply terminal of the first voltage and the second voltage of the memory circuit and the reference power source potential, wherein a common node of the first and the second switching elements and a common node of the third and the fourth switching elements are connected to the first pixel electrode and the second pixel electrode, respectively, of the liquid crystal element, and wherein whether any one of a pair of the first and the fourth switching elements and a pair of the first and the third switching elements is turned on is determined by a switching control signal; and wherein all the first, the second, the third, and the fourth switching elements are the same conductivity type transistors, and the switching control signal is clock signals reverse to each other in phase.