2008•Optics ExpressOpen access

Optically compensated circular polarizers for liquid crystal displays

Chi‐Huang Lin

Abstract

An optical compensation principle of the crossed circular polarizers is developed to widen the viewing angle of high-transmittance multi-domain vertical-alignment liquid crystal displays (MVA-LCDs). The optical properties of a biaxial film are analyzed by the Berreman 4x4 matrix method, and the analytical solution for the slow-axis orientation of a biaxial film is calculated to obtain the compensation principle of the crossed circular polarizers. Based on this compensation principle, the high-transmittance MVA-LCD theoretically has a complete 80 degrees viewing cone for contrast ratio (CR)>100:1 and experimental results reveal that the compensated high-transmittance MVA-LCD can achieve a viewing angle of over the entire 80 degrees viewing cone for CR>20:1. Practical application as a mobile display is emphasized.

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Available abstract

Key concepts: Polarizer, Optics, Transmittance, Liquid-crystal display, Viewing angle, Materials science, Compensation (psychology), Liquid crystal