Fabrication of vertical alignment liquid crystal cell without forming a conventional polyimide-alignment layer

ABSTRACT

A novel preparation method of the vertical alignment polymer film (VAPF) was proposed by polymerisation of the monomers, 2,3-difluoro-4ʹ-[2-(diacryloyl-oxy-hexyl)methyl ester-hexadecyl-oxy]-biphenyl (DFDAMHB) and 2,7-dimethacryloyl-oxy-phenanthrene (DMAPhen), being dissolved in the liquid crystal (LC) material. For obtaining the vertical alignment (VA), the ultraviolet exposure was carried out to the LC cell below the nematic to isotropic transition temperature of the LC material. The VA mode LC cell with the VAPF produced from the monomers DFDAMHB and DMAPhen exhibited enough level of electro-optical and response properties, high voltage holding ratio and low residual direct current voltage.

GRAPHICAL ABSTRACT

KEYWORDS:

• Liquid crystals
• monomers
• polymerisation
• nematic to isotropic transition temperature
• vertical alignment polymer film

Disclosure statement

No potential conflict of interest was reported by the author.