Sunlight readability of displays: a numerical scale

Robert Sharpe, Colin M. Cartwright, W. Allan Gillespie, Ken Vassie, W. Colin Christopher

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


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.
Original languageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationFourth Oxford Conference on Spectroscopy
EditorsArt Springsteen, Michael Pointer
Place of PublicationBellingham
Number of pages0
Publication statusPublished - 2003
EventFourth Oxford Conference on Spectroscopy - Davidson, United States
Duration: 10 Jun 200212 Jun 2002
Conference number: 4

Publication series

NameProceedings of SPIE: the International Society for Optical Engineering


ConferenceFourth Oxford Conference on Spectroscopy
Country/TerritoryUnited States


  • Sunlight


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