Transmissive liquid crystal cell parameters measurement by spectroscopic ellipsometry
نویسندگان
چکیده
A powerful method for liquid crystal ~LC! cell twist angle and retardation measurement is presented. This method is based on the spectroscopic ellipsometry. By varying the polarizer and analyzer angles only, a transmission spectrum containing null transmission at some particular wavelengths can be obtained. Analytical equations derived bases on a polarization analysis of twisted birefringent layers are then solved to give all the LC cell parameters. In general, the twist angle, twist sense, retardation, and the rubbing direction can all be determined. Measurement results on commercial liquid crystal display panels are presented. © 2001 American Institute of Physics. @DOI: 10.1063/1.1332800#
منابع مشابه
Spectroscopic ellipsometry study of liquid crystal and polymeric thin films in visible and near infrared.
In this work, we propose spectroscopic ellipsometry as a suitable method for measuring optical properties in soft materials, polymers and liquid crystals, specially selected for use in photonics applications. We show the results of our measurements on some multilayered samples, in the range from visible to the near-IR region, of interest for telecom applications. We point out potentialities and...
متن کاملSingle Cell-gap Transflective color TFT-LCD by using Image-Enhanced Reflector
By building an image-enhanced reflector above the transmissive region of liquid crystal cell, the transmissive light can follow the similar path with ambient light that both reflective and transmissive portions can achieve high optical efficiency. same response time and color saturation. Furthermore, onk single retardation film is required in this transflective color TFT-LCD, and ambient light ...
متن کاملP-85: Reflective Liquid-Crystal Cell-Gap Measurement Using Input-Polarization-Angle Dependence
Surface-reflection component is blocked by the analyzer A simple technique of measuring a reflective TN liquid crystal (LC) cell gap using a laser is described. It utilizes a very unique property of strong input-polarization-angle dependence of the reflective LCs, which is not observed in the conventional transmissive LCs. This technique eliminates the surface-reflection problem which can be en...
متن کاملCharacterization of Nanocrystals Using Spectroscopic Ellipsometry
First applications of ellipsometry to the measurement of polyand nanocrystalline thin films date back to many decades. The most significant step towards the ellipsometric investigation of composite thin films was the realization of the first spectroscopic ellipsometers in the ’70s [3, 4, 8], which allowed the measurement of the dielectric function, the imaginary part of which is directly relate...
متن کاملWide-view and sunlight readable transflective liquid-crystal display for mobile applications.
A wide-view single cell gap transflective liquid-crystal display (TR-LCD) using the fringe field switching effect is proposed by incorporating a quarter-wave in-cell-retarder below the liquid-crystal (LC) cell in the reflective part. By optimizing the angle between the electrode stripes and the LC rubbing direction in the transmissive and the reflective regions, this TR-LCD exhibits a high opti...
متن کامل