Abstract
We previously found that the reflective LCDs that use single polarizer, double-layered TN-LCDs (DTN-LCDs) with λ/4-plate and /or a retardation film exhibit an achromatic image of superior luminous reflectance of about 50% and a high contrast ratio, even if the on-voltage is reduced to 2V. In this paper, we numerically analyzed the influence of the material parameters of a liquid crystal on the electro-optical properties in the LCDs in order to confirm the possibility of reducing power consumption further. Our results demonstrate that ultra-low-power (1V in the on-state) reflective TFT-LCDs with high-quality images can be realized if a liquid-crystal material with large values of K_<33>/K_<11> and Δ ε/ε_⊥ can be developed. The power consumption can thus be decreased to one-ninth of that of the presently used reflective 3V TFT-LCD, while maintaining a high-quality image.
