Accurate color predictability based on a spectral retardance model of a twisted-nematic liquid-crystal display

摘要

In this work we present the application of a simple physical model to accurately predict the broadband spectral transmittance and colorimetric properties of a twisted-nematic liquid crystal display (TNLCD). We spectroscopically calibrate the retardance parameters to evaluate the spectrum of the light transmitted by a TNLCD sandwiched between two linear polarizers. When the TNLCD is illuminated with a broadband light source, the full spectrum can be predicted as a function of the addressed gray level for any arbitrary orientation of the polarizers. Thus, the color of the transmitted light can be also be estimated with very good accuracy. As an example, a polarizers' configuration is shown that yields, without using color filters, a relatively large color gamut compared to the standard configuration. Experimental results confirming the validity of such predictions are presented, both on the measured spectral responses as well as on the trajectories at different chromatic diagrams.