Plasma addressed liquid crystal display panel with optimized relationship between liquid crystal parameters and cover sheet thickness

摘要

In a plasma addressed liquid crystal display panel comprising a channel substrate, a cover sheet, a layer of twisted nematic liquid crystal material, an upper substrate, and an array of electrodes on the lower surface of the upper substrate, ##EQU1## where V.sub.x is the voltage that will turn a simple TN liquid crystal cell from the off state to X% transmissive in a normally black mode, d.sub.TD is the thickness of the cover sheet, d.sub.LC is the thickness of the liquid crystal layer, . epsilon..sub.TD is the dielectric constant of the cover sheet, &egr;. sub. ⊥ is the perpendicular dielectric constant of the liquid crystal material, and &egr;.sub.∥ is the parallel dielectric constant of the liquid crystal material, and d.sub. LC &Dgr;n.sub.LC is in the range from about 0.4 to 0.5, where &Dgr;n. sub.LC is the difference in refractive indices for the liquid crystal material.