Formation of liquid crystal multi-domains with different threshold voltages by varying the surface anchoring energy

Abstract

We propose methods to obtain multi-domains with different threshold voltages for vertically aligned liquid crystal displays without additional transistors or capacitors. We exposed an ultraviolet light through a photomask and spatially varied the surface anchoring energy by partially decomposing the polyimide or inducing the adsorption of reactive monomers. The threshold voltage was reduced with smaller surface anchoring, and the reduction of the threshold could be qualitatively interpreted using a model describing a weak anchoring condition.

Multifunctional Optical Thin Films Fabricated by the Photopolymerization of Uniaxially Oriented Lyotropic Liquid Crystal Monomers for Electro-Optical Devices

“…Polar anchoring energy ( W ) indicating the energetic cost to deviate LC from the initial alignment state is determined by the high-electric field techniques4950. As shown in Fig.…”

P.100: Multi‐domain Vertical Alignment of Liquid Crystals Through Control of the Anchoring Energy

“…To improve the off-axis image quality, various methods have been proposed for realization of the multi-domain VA mode [5][6][7][8][9][10]. Recently, an eight-domain structure for reduction of the gamma shift was proposed by using additional thin-film transistors or capacitors [8][9][10].…”

Effect of the polarisation direction and incident angle of a UV light on the electrooptical response of the polymer-stabilised vertically aligned in-plane switching liquid crystal

“…VA mode has been modified to improve the viewing angle property and various kinds of advanced VA mode have been suggested such as the multi-domain VA using protrusion (MVA), [1,2] the multi-domain VA using patterned electrodes (PVA) [3] and the polymer-stabilised VA with fine electrodes (PSVA). [4][5][6][7][8][9] The VA mode uses the liquid crystal (LC) material with a negative dielectric anisotropy Δε. However, the rotational viscosity γ of the negative Δε LC is generally greater than the one of the positive Δε materials, thus increasing the response time.…”