ABSTRACT
It is very difficult to display greyscale for an optically driving liquid crystal display (ODLCD) because the driving unit and display unit are separate, and there are no electronics in the display part of ODLCD. In this paper, two greyscale generation methods are proposed to achieve this goal. Six and nine grey levels are separately achieved through the two methods.
Graphical Abstract
![](/cms/asset/76075c48-79b0-4612-8589-dbe2bd0c1dea/tlct_a_1566505_uf0001_oc.jpg)
Disclosure statement
No potential conflict of interest was reported by the authors.