An Optical Method for Pretilt and Profile Determination in LCOS VAN displays

Cerrolaza Martínez, Beatriz; Geday, Morten Andreas; Quintana Arregui, Patxi Xabier y Otón Sánchez, José Manuel (2010). An Optical Method for Pretilt and Profile Determination in LCOS VAN displays. "Journal of Display Technology", v. 7 (n. 3); pp. 141-150. ISSN 1551-319X. https://doi.org/10.1109/JDT.2010.2050857.

Descripción

Título: An Optical Method for Pretilt and Profile Determination in LCOS VAN displays
Autor/es:
  • Cerrolaza Martínez, Beatriz
  • Geday, Morten Andreas
  • Quintana Arregui, Patxi Xabier
  • Otón Sánchez, José Manuel
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Display Technology
Fecha: Enero 2010
Volumen: 7
Materias:
Palabras Clave Informales: Liquid crystal on silicon (LCoS), pretilt angle, reflective display, twist angle, vertically aligned nematic (VAN).
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 and cell thickness are two extremely important parameters in predicting the behavior of vertically aligned negative nematic liquid crystal (LC) displays. The accurate estimation of pretilt angle and cell thickness is not a trivial task when these devices work in reflective mode, as in liquid crystal on silicon (LCOS) vertically aligned nematic (VAN) displays. Usual experimental setups are based on the proportionality between the retardation of the polarization components of the incident light and the product effective birefringence times thickness. However, any attempt to separate the two product variables is cancelled out by symmetry from reflection. This work shows a relatively simple method capable of separating both variables, allowing accurate, independent measurements of pretilt and thickness, as well as other configurations details, such as residual twist. A simulation model based on the properties of actual reflective displays has been developed. An experimental setup specifically designed for measuring LCOS VAN cells has been prepared. Initial comparisons between experimental measurements of intensity and theoretical results showed some discrepancies that could be explained assuming that the LC profile contains a residual twist from the manufacturing process. Including that twist in the model, an excellent agreement between theory and experiment has been achieved. Matching simulations and experimental results yield separate determinations of pretilt angle and thickness, and give good estimates for the residual twist angle.

Más información

ID de Registro: 7230
Identificador DC: http://oa.upm.es/7230/
Identificador OAI: oai:oa.upm.es:7230
Identificador DOI: 10.1109/JDT.2010.2050857
URL Oficial: http://ieeexplore.ieee.org
Depositado por: Memoria Investigacion
Depositado el: 14 Jun 2011 10:59
Ultima Modificación: 20 Abr 2016 16:25
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