28 August 2002 LCD ruggedization for severe environments
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Abstract
Practical methods for quantifying and understanding the dynamic characteristics of liquid crystal display stack assemblies for use in rugged avionics environments are presented. The failure modes of LCD stack assemblies in vibration are typically a function of excessive transverse deflections and in-plane displacements. Fortunately, classical plate theory facilitates the study of display stack dynamics, and offers ways to quantify deflection and displacement in terms of resonant frequency and transmissibility. However, specific dynamic material properties are required but typically not known, given the inherent complexity of a laminated liquid crystal display stack. The free-free vibration test is therefore documented as a viable method for the obtainment of equivalent dynamic stack properties in a cost effective and timely manner. Characterization testing in the free-free and vibration table environments was completed using display stack sub-components of various sizes and configurations in order to validate the process. Also, a design of experiment was conducted to gain a better understanding of how different mounting conditions impact longitudinal deflection, as well as lateral and vertical resonant frequency and displacement. Based on research, testing, and analyses completed, liquid crystal display stack design guidelines for vibration performance are included.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christian T. Deloy, Courtney W. McCauley, "LCD ruggedization for severe environments", Proc. SPIE 4712, Cockpit Displays IX: Displays for Defense Applications, (28 August 2002); doi: 10.1117/12.480959; https://doi.org/10.1117/12.480959
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