Effect of azimuthal anchoring energy on rewriting speed of optical rewritable e-paper

ABSTRACT

Effect of azimuthal anchoring energy on rewriting speed of optical rewritable (ORW) e-paper was investigated in this paper. Azimuthal anchoring energy and rewriting time of ORW e-paper were measured at various conditions with different spin coating time and speed, different baking time and temperature of the azo-dye SD1 alignment film as well as different filling conditions of liquid crystal. It is demonstrated that filling LC in atmosphere condition could increase the changing rate of azimuthal anchoring energy at the initial stage and obtain the decreased final azimuthal anchoring energy, which would double the rewriting speed ORW e-paper. Meanwhile increasing the spin coating speed and time would cause non-continuous film formation of alignment layer, which gives rise to large writing speed variations for many samples, some with fast rewriting speed while others with low rewriting speed, which is not good for practical use. The results demonstrate that with proper fabrication condition of alignment layer for liquid crystal ORW e-paper, the changing rate of azimuthal anchoring energy could be changed and the final azimuthal anchoring energy could be modulated, which would give rise to different rewriting speed.

GRAPHICAL ABSTRACT

KEYWORDS:

• Optical rewritable
• anchoring energy
• rewriting speed
• SD1

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported in part by the Shenzhen Fundamental Research fund under Grant (No. JCYJ20170306100015508) and National Natural Science Foundation of China (61775212, 61811530061).