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1 July 1997 Long-life fluorescent lamp driver for avionics applications
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Fluorescent backlights used for LCDs provide high efficacy, but at the expense of a strong temperature dependence and unusual electrical load parameters. The selection of drive regime and arc wave form can greatly affect the cathode life. Phosphor life has ben characterized as a function of wall loading and profile by others. The next cause of life reduction is cathode wear, which is addressed. A waveform is described that has been proven to provide long cathode life, both in the field and in ongoing life test. The fundamental tenant of minimizing the peak to RMS ration of the drive waveform has been applied. Additional cathode stress factors are identified, such as warm-up requirements, minimum temperature of operation and determining the critical value for cathode preheat. Types of filament preheat control are discussed, with the advantages and disadvantages of each presented. The second order effects of implementations are discussed. Summary data from an ongoing life test will be presented, indicating that with proper care and careful design, cathodes can easily achieve at least 75,000 hour life.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gary D. Bishop and David N. Giebler "Long-life fluorescent lamp driver for avionics applications", Proc. SPIE 3057, Cockpit Displays IV: Flat Panel Displays for Defense Applications, (1 July 1997);

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