Novel fabrication process of polymer-sustained-alignment liquid crystal cell and its image sticking property

ABSTRACT

A new fabrication process of the polymer-sustained-alignment (PSA) liquid crystal (LC) cell is proposed in this study. The proposed process for fabrication of the PSA-LC cell is in the following: the mixed solution of the vertical polyimide (PI) alignment layer material and the monomer 4,4ʹ-dimethacryloyl-oxy-biphenyl (4,4ʹ-DMABiph) was firstly prepared, and then the PI alignment layer including the monomer 4,4ʹ-DMABiph was prepared on the substrate. The monomer 4,4ʹ-DMABiph was confirmed to be located on the surface of the PI-film by the TOF-SIMS analysis. The polymerisation of the monomer was conducted by exposure of ultraviolet light to the PI-film. Finally, new PSA-LC cell was fabricated by the assembly of the substrates and injection of the LC material. The residual direct current voltage of the PSA-LC cell produced by the proposed fabrication process was significantly improved compared with the PSA-LC cell produced by the conventional process. Therefore, the proposed fabrication process would be useful for the new-type PSA-LCD.

Graphical abstract

KEYWORDS:

• PSA-LCD
• fabrication process
• polyimide alignment layer
• monomer

Disclosure statement

No potential conflict of interest was reported by the author.