The design of liquid crystal cell is an important factor to determine the display quality of LCoS display device. The goal
of this paper is to gain VGA field sequential color (FSC) LCoS device used for near-to-eye system. The characteristics of
optics and electrooptics for the twist nematic liquid crystal material and the material requirements of the FSC LCoS were
studied. The LCOS liquid crystal cell optimized by dynamic parameter space method had an uniform reflectivity (about
90%) for the light with wave length from 450nm to 650nm. Both considering the electrooptic response curve of liquid
crystal and the relationship between the contrast ratio and pixel size, we determined to use high speed twist nematic
liquid crystal working in normally white mode. The liquid crystal cell gap and the pixel size were determined as 2.5um
and 12um, respectively. The VGA FSC LCoS device was fabricated with SMIC 0.35um CMOS process and filled with
LC-A liquid crystal of Merck in Varitronix. The measurement showed that the response time of liquid crystal from light
to dark was 1.8ms and from dark to light was 4.4ms. The contrast ratio is bigger than 50:1. The LCoS displays well.
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