Abstract
We have optimized the optical characteristics of scattering films, in order to improve the performance of reflective color STN-LCDs. We propose a new evaluation method using the parameter of capability of collecting light. The scattering film optimized by this method achieves good capability of collecting light, whiteness, wide viewing angle, almost negligible depolarization, back scattering and blur. By using this optimized scattring film, we have realized a 7.8-in.-diagonal reflective color STN-LCD with a single polarizer. Driven with a passive matrix with 1/480 duty cycle, this display achieves 12% reflectance, 1:10 contrast ratio and good achromaticity.
