Orientation Control and Fixation of Discotic Liquid Crystal

Abstract

We established hybrid, horizontal, vertical, and vertical-twisted alignment of discotic liquid crystals on web-coating thin film. Newly developed materials are the photopolymerizable discotic liquid crystals, in order to fix desired novel alignment, the alignment promoters that deposit toward air surface during web coating, followed by drying of solvent, and then accomplish desired alignment of liquid crystals, the alignment layers that promote desired alignment of liquid crystals from the substrate side and the chiral agents, which have strong chiral powers in small amounts. Hybrid aligned discotic liquid crystal thin film has proven quite effective in expanding the viewing angle of thin film transistor liquid crystal displays.

Functional liquid-crystalline polymers and supramolecular liquid crystals

“…For example, nematic LC networks have been widely investigated (Figure 1, right, bottom) and applied in display technologies, and in particular, in the confection of optical compensation films. 211,212 Dense cross-linked nematic and cholesteric materials still exhibit glass transitions (between 40 and 120°C) that are also accompanied by shape deformations. 45,184,213 These properties have been exploited to prepare densely cross-linked nematic or cholesteric polymer networks with intriguing programmable stimuli-responsive properties after their careful alignment.…”

New Triphenylene Based Discotic Liquid Crystals with Mixed Tails: Molecular Symmetry and Wide Columnar Mesophase Range

“…Hexaalkoxytriphenylenes TP(OR) 6 show low melting points, clearing points and narrow columnar mesophases because of the alkyl flexibility, while hexaalkanoyloxytriphenylenes TP(OCOR) 6 exhibit high melting points, high clearing points due to C＝O group increasing the conjugation system of triphenylene core and its polarizability. The high temperature phase transition makes it not suitable for physical property study and practical application.…”

“…[1][2][3][4][5] Triphenylene based liquid crystal materials with discotic nematic phase (N D phase) have been used commercially in phase compensation films to improve the viewing angle of liquid crystal display devices. 6,7 More triphenylene-containing liquid crystal materials with rectangular columnar mesophase (Col r ) or hexagonal columnar mesophase (Col h ) have been exploited as photoconductors, hole transport materials in organic light emitting diodes (OLED) and photovoltaic cells, solid electrolytes for secondary lithium batteries, gas sensor materials, and optical data storage materials. 4,5,[8][9][10] Therefore triphenylene discogens show great application potentials in the forthcoming organic electronics ages.…”

Synthesis of Mixed Tail Triphenylene Discotic Liquid Crystals: Molecular Symmetry and Oxygen‐Atom Effect on the Stabilization of Columnar Mesophases

“…[1][2][3][4] They were studied as photoconductors, [1][2][3][4][5][6] charge transport materials of photovoltaic cells, 7 active materials in light emitting diodes, 8 gas sensor materials, 9 ion transport materials, 10 optical materials of display devices, 11,12 and showed huge potential applications. High ordered hexagonal columnar mesophases, fine homeotropic alignment behaviors and wide mesophase temperature ranges are the most important parameters in the practical application of discotic liquid crystal materials.…”