Measuring Thickness and Pretilt in Reflective Vertically Aligned Nematic Liquid Crystal Displays

Cerrolaza Martínez, Beatriz; Geday, Morten Andreas; Otón Sánchez, José Manuel; Bennis, Noureddine y Quintana Arregui, Patxi Xabier (2008). Measuring Thickness and Pretilt in Reflective Vertically Aligned Nematic Liquid Crystal Displays. "Molecular Crystals and Liquid Crystals", v. 494 ; pp. 222-230. ISSN 1542-1406. https://doi.org/10.1080/15421400802430331.

Descripción

Título: Measuring Thickness and Pretilt in Reflective Vertically Aligned Nematic Liquid Crystal Displays
Autor/es:
  • Cerrolaza Martínez, Beatriz
  • Geday, Morten Andreas
  • Otón Sánchez, José Manuel
  • Bennis, Noureddine
  • Quintana Arregui, Patxi Xabier
Tipo de Documento: Artículo
Título de Revista/Publicación: Molecular Crystals and Liquid Crystals
Fecha: 2008
Volumen: 494
Materias:
Palabras Clave Informales: pretilt angle; residual twist; vertically aligned nematic
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Tecnología Fotónica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Pretilt angle is a parameter of the utmost importance in the ultimate performance of vertically-aligned negative nematic LC displays. When these devices work in reflective mode, as is the LCOS microdisplays, accurate measurement of pretilt angles becomes a difficult problem, since usual experimental setups based on retardation of the polarization components of the impinging light are proportional to the product effective birefringence (neff - no) times thickness, and any attempt to separate these variables is cancelled out by symmetry. This work shows a relatively simple method capable of separating both variables. An experimental setup specifically aimed at vertically aligned reflective cells has been prepared. At the same time, a simulation model has been developed taking into account the properties of actual reflective displays. Comparison between experimental and theoretical results shows some discrepancies that can be explained assuming that the LC profile contains a residual twist. Including that twist in the model, an excellent agreement between theory and experiment has been achieved. Matching of simulations and measurements yields to the separate determination of pretilt angle and thickness and gives good estimates for the residual twist angle.

Más información

ID de Registro: 2819
Identificador DC: http://oa.upm.es/2819/
Identificador OAI: oai:oa.upm.es:2819
Identificador DOI: 10.1080/15421400802430331
URL Oficial: http://www.informaworld.com/smpp/title~content=t713644168
Depositado por: Memoria Investigacion
Depositado el: 21 Abr 2010 11:56
Ultima Modificación: 20 Abr 2016 12:28
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