Bi-stable chiral splay nematic mode liquid crystal display device and method of driving the same

摘要

A liquid crystal display device includes: first and second substrates facing and spaced apart from each other; a gate line and a data line on the first substrate, the gate line and the data line crossing each other to define a pixel region; a thin film transistor and a pixel electrode in the pixel region on the first substrate, the thin film transistor connected to the gate line and the data line, the pixel electrode connected to the thin film transistor; a common electrode on the second substrate, the common electrode facing the pixel electrode; at least one first reset electrode and at least one second reset electrode on one of the first and second substrates, the at least one first reset electrode and the at least one second reset electrode spaced apart from each other; and a bi-stable chiral splay nematic liquid crystal layer between the first and second substrates, the bi-stable chiral splay nematic liquid crystal layer having bi-stable states of a splay state as an initial state and a π-twist state, wherein first and second reset voltages are applied to the at least one first reset electrode and the at least one second reset electrode, respectively, and wherein the bi-stable chiral splay nematic liquid crystal layer transitions from the π-twist state to the splay state by applying the first and second reset voltages.

主权项

1. A method of driving a liquid crystal display device including a bi-stable chiral splay nematic liquid crystal layer having bi-stable states of a splay state as an initial state and a π-twist state, comprising:
applying a data voltage and a common voltage to a pixel electrode in each of a plurality of pixel regions and a common electrode facing the pixel electrode, respectively during a writing period; floating each of the pixel electrode and the common electrode by not supplying each of the data voltage and the common voltage such that the bi-stable chiral splay nematic liquid crystal layer has the bi-stable states corresponding to the data voltage during a memory period; and applying first and second reset voltages to at least one first reset electrode and at least one second reset electrode, respectively, during a reset period, wherein the bi-stable chiral splay nematic liquid crystal layer transitions from the π-twist state to the splay state during the reset period, wherein each of the plurality of pixel regions includes a thin film transistor connected to a corresponding one of a plurality of gate lines and a corresponding one of a plurality of data lines crossing each other on a first substrate, wherein the at least one first reset electrode and the at least one second reset electrode extend along a direction parallel to one of the plurality of gate lines and the plurality of data lines, and pass through the plurality of pixel regions, and wherein each of the first and second reset voltages for transitioning the bi-stable chiral splay nematic liquid crystal layer from the π-twist state to the splay state alternately has a high level voltage and a low level voltage, and the first and second reset voltages have relatively opposite polarities.