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Evaluating the Environmental Impacts of a Nano-Enhanced Field Emission Display Using Life Cycle Assessment: A Screening-Level Study
journal contribution
posted on 2014-01-21, 00:00 authored by Venkata
K. K. Upadhyayula, David E. Meyer, Mary Ann Curran, Michael
A. GonzalezCarbon
nanotube (CNT) field emission displays (FEDs) are currently
in the product development stage and are expected to be commercialized
in the near future because they offer image quality and viewing angles
comparable to a cathode ray tube (CRT) while using a thinner structure,
similar to a liquid crystal display (LCD), and enable more efficient
power consumption during use. To address concerns regarding the environmental
performance of CNT-FEDs, a screening-level, cradle-to-grave life cycle
assessment (LCA) was conducted based on a functional unit of 10 000
viewing hours, the viewing lifespan of a CNT-FED. Contribution analysis
suggests the impacts for material acquisition and manufacturing are
greater than the combined impacts for use and end-of-life. A scenario
analysis of the CNT paste composition identifies the metal components
used in the paste are key contributors to the impacts of the upstream
stages due to the impacts associated with metal preparation. Further
improvement of the manufacturing impacts is possible by considering
the use of plant-based oils, such as rapeseed oil, as alternatives
to organic solvents for dispersion of CNTs. Given the differences
in viewing lifespan, the impacts of the CNT-FED were compared with
a LCD and a CRT display to provide more insight on how to improve
the CNT-FED to make it a viable product alternative. When compared
with CRT technology, CNT-FEDs show better environmental performance,
whereas a comparison with LCD technology indicates the environmental
impacts are roughly the same. Based on the results, the enhanced viewing
capabilities of CNT-FEDs will be a more viable display option if manufacturers
can increase the product’s expected viewing lifespan.
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field emission displaysproduct alternativeCNT paste compositionmanufacturing impactscontribution analysisproduct development stageaddress concerns10 000cathode ray tubepower consumptionmaterial acquisitionmetal preparationscenario analysisLCACRT displayLCD technologyoffer image qualityFEDEnvironmental ImpactsLife Cycle Assessmentlife cycle assessmentlifespanrapeseed oildisplay optioncrystal displayCRT technologymetal components
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