P-134: Effects of Surface Anchoring Energy on Electro-optic Characteristics of Fringe-Field Switching (FFS) Liquid Crystal Display

Abstract

We investigated how surface anchoring strength affects the electro-optic (EO) characteristics of a fringe-field switching (FFS) mode. Unlike IPS mode that only azimuthal anchoring mainly contributes to the EO performances, both azimuthal and polar anchoring energies play an important role such that the transmittance increases with decreasing magnitude of azimuthal energy but increasing polar anchoring energy in the FFS mode when using a LC with positive dielectric anisotropy. In addition, weak anchoring at the electrode edge may result in change in initial LC optic axis by applied voltage stress so local control of anchoring energy is proposed.

Alignment control technology of liquid crystal molecules

“…153,154 In addition, Sato et al [155][156][157] developed an IPS-mode LCD by forming a dense polymer brush that showed almost no anchoring energy on the comb-electrode and achieved a 30% improvement in transmittance, although there was a problem of a slow fall response. Meanwhile, Ham et al 158 showed by calculation that not only the SAS of the azimuthal direction but also the SAS of the polar direction largely affect display characteristics in a FFS mode and realized high transmittance by controlling the SAS of the alignment film on comb electrodes. A bistable display combining weak anchoring alignment layer with a TN mode has been developed.…”