LIQUID CRYSTAL DISPLAY DEVICE

摘要

A liquid crystal display device includes: a first substrate; a second substrate facing the first substrate; and a liquid crystal layer sandwiched between the first substrate and the second substrate. The first substrate has thereon a first planar electrode, a first dielectric layer on the first planar electrode, and a pair of comb-shaped electrodes on the first dielectric layer. The second substrate has thereon a second planar electrode and a second dielectric layer on the second planar electrode. The liquid crystal layer includes liquid crystal molecules having a positive dielectric anisotropy. The liquid crystal display device is configured such that, when displaying a minimum gradation, a same voltage is applied to the pair of comb-shaped electrodes, and a relationship among voltages applied to the first planar electrode, the pair of comb-shaped electrodes, and the second planar electrode satisfies a prescribed relational expression.

主权项

1. A liquid crystal display device, comprising:
a first substrate; a second substrate facing the first substrate; and a liquid crystal layer sandwiched between the first substrate and the second substrate, wherein the first substrate has thereon a first planar electrode, a first dielectric layer on the first planar electrode, and a pair of comb-shaped electrodes on the first dielectric layer, an additional dielectric layer being essentially absent between the liquid crystal layer and the pair of comb-shaped electrodes and between the liquid crystal layer and the first dielectric layer, wherein the second substrate has thereon a second planar electrode and a second dielectric layer on the second planar electrode, an additional dielectric layer being essentially absent between the second dielectric layer and the liquid crystal layer, wherein the liquid crystal layer includes liquid crystal molecules having a positive dielectric anisotropy, and wherein the liquid crystal display device is configured such that, when displaying a minimum gradation, a same voltage is applied to the pair of comb-shaped electrodes, and a relationship among voltages applied to the first planar electrode, the pair of comb-shaped electrodes, and the second planar electrode satisfies the following expressions (1) and (2):0<Va<2Va_0-0.1(1)Va_0=ɛɛ2d1ɛ1ɛ2dLC+ɛ1ɛd2Vb(2) where Va (unit: V) is a voltage differential between the voltage of the first planar electrode and the voltage of the pair of comb-shaped electrodes, Vb (unit: V) is a voltage differential between the voltage of the pair of comb-shaped electrodes and the voltage of the second planar electrode, ∈1 is a permittivity of the first dielectric layer, ∈2 is a permittivity of the second dielectric layer, ∈1 is a permittivity in a direction that is horizontal with respect to a director of the liquid crystal molecules included in the liquid crystal layer, d1 is a thickness (unit: μm) of the first dielectric layer, d2 is a thickness (unit: μm) of the second dielectric layer, and dLC is a thickness (unit: μm) of the liquid crystal layer.