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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/280

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Title: Sunlight readability of displays: a numerical scale
Authors: Sharpe, Robert
Cartwright, Colin M.
Gillespie, W. Allan
Vassie, Ken
Christopher, W. Colin
Affiliation: University of Abertay Dundee. School of Contemporary Sciences
Keywords: Sunlight
Issue Date: 2003
Publisher: International Society for Optical Engineering
Type: Conference Paper
Refereed: peer-reviewed
Rights: Published version (c)International Society for Optical Engineering, available from DOI: 10.1117/12.514544
Citation: Sharpe, R., et al. 2003. Sunlight readability of displays: a numerical scale. Proceedings- Spie : Fourth Oxford Conference on Spectroscopy. 4826(176). [Online] Available from: DOI: 10.1117/12.514544
Abstract: There is a great deal of interest in the sunlight readability of displays. How to quantify this, particularly on a numerical scale rather than pass/fail is an important consideration. Some military standards exist e.g. MIL-L-85762A but are these appropriate to non-military products? We report the use of a method developed by BAE SYSTEMS, the model is based on our ability to see things by virtue of a difference in either luminance or chrominance, or both. The model uses a method called PJND (Perceptible Just Noticeable Difference), based on LJND (Luminance Just Noticeable Difference) and CJND (Chrominance Just Noticeable Difference) thresholds. The basis of this model is a series of acceptance criteria established by subjects in a realistic environment; BAE SYSTEMS have an Ambient Lighting Facility (ALF) which simulates many lighting scenarios that are likely to be encountered in real life. Product mock-ups were taken into this environment and subjects were asked to choose levels of acceptance for differing screen presentations and various lighting geometries. The method results in a single figure of readability, which in effect summarizes the task and environment. This figure can then form the basis of a specification between display supplier and vendor. We plan to develop the model such that it should be possible to predict the best combination of treatments to apply to the display surface to give the optimum and most cost effective sunlight readable display for a given application and product.
URI: http://hdl.handle.net/10373/280
ISSN: 0277-786X
Appears in Collections:Science Engineering & Technology Collection

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