ABSTRACT
Seven segment number displays are ubiquitous and popular. They are simple and familiar. They seem to make economic sense, and with only seven segments they require little wiring and electronics to support. They are cheap to buy and cheap to use; they make seemingly effective and unproblematic products.
This paper illustrates many examples of problematic uses of seven segment displays that could have been avoided. More generally, the paper raises design questions and some solutions to be considered when designing numerical displays, and certainly before uncritically using seven segment displays. Although there are markets and applications where cost may be an overriding consideration, for safety critical and other dependable types of use (including general purpose devices that may sometimes be used for critical tasks) more legible alternatives than standard seven segment displays should be preferred.
- Aviation Safety Network, Accident description: Air Inter Flight 148, aviation-safety.net/database/ record.php?id=19920120-0, 1992.Google Scholar
- Benford, F. The law of anomalous numbers. Proc. American Philosophical Society 78, 4 (1938), 551--572.Google Scholar
- Ellis, N. C., and Hill, S. E. A comparative study of seven segment numerics. Human Factors 20, 6 (1978), 655--660.Google ScholarCross Ref
- Federal Drug Administration. Possible dosing errors with the OptiClik insulin injection device. FDA Patient Safety News #60 (February 2007).Google Scholar
- Google, Search results for "new ...," first 200 images where displays are visible, www.google.com, Dec 2012.Google Scholar
- Green, P., Goldstein, S., Zeltner, K., and Adams, S., Legibility of text on instrument panels: A literature review, The University of Michigan Transportation Research Institute, UMTRI-88-34 (NTIS No. PB 90 141342/AS), deepblue.lib.umich.edu/handle/2027.42/790, 1988.Google Scholar
- Gunderson, J., Gruetzmacher, G., and Swanson, N. Legibility of seven segment numeric LED displays: Comparisons of two fonts at various distances. In Proc. Human Factors Society 35th Annual Meeting (1991), 491--495.Google ScholarCross Ref
- Institute of Safe Medication Practices, Error-prone abbreviations symbols dose designations, www.ismp.org/Tools/errorproneabbreviations.pdf, 2010.Google Scholar
- Knuth, D. E. Digital Typography. Center for the Study of Language and Information, CSLI, 1999. Google ScholarDigital Library
- Knuth, D. E. The Art of Computer Programming, vol. 4A. Addison-Wesley, 2011.Google Scholar
- Nacenta, M., Hinrichs, U., and Carpendale, S. Fatfonts: Combining the symbolic and visual aspects of numbers. In AVI'12, Proc. Int. Working Conf. Advanced Visual Interfaces, ACM (2012), 407--414. Google ScholarDigital Library
- Oladimeji, P., Thimbleby, H., and Cox, A. Number entry interfaces and their effects on errors and number perception. In Proc. Interact 2011, vol. IV, Springer-Verlag (2011), 178--185. Google ScholarDigital Library
- Roche Diagnostics, Accu-Chek Compact Plus® blood glucose meter owner's booklet, www.accu-chek.com, 2006.Google Scholar
- RVS Group, Computer-related incidents with commercial aircraft: The Air Inter A320 accident near Strasbourg, www.rvs.uni-bielefeld.de, 2005.Google Scholar
- Sassoon, R. Computers and Typography. Intellect Books, 1993.Google Scholar
- Thimbleby, H. Calculators are needlessly bad. International Journal of Human-Computer Studies 52, 6 (2000), 1031--1069. Google ScholarDigital Library
- Thimbleby, H. Interactive numbers - A grand challenge. In Proc. Int. Conf. Interfaces and Human Computer Interaction 2011, K. Blashki, Ed. (2011), xxviii--xxxv.Google Scholar
- Thimbleby, H., and Cairns, P. Reducing number entry errors: Solving a widespread, serious problem. Journal Royal Society Interface 7, 51 (2010), 1429--1439, DOI: 10.1098/rsif.2010.0112.Google ScholarCross Ref
- Van Nes, F. L., and Bouma, H. On the legibility of segmented numerals. Human Factors 22, 4 (1980), 463--474, DOI: 10.1177/001872088002200407.Google ScholarCross Ref
- Wikipedia, Seven-segment display character representations, en.wikipedia.org, 2011.Google Scholar
Index Terms
- Reasons to question seven segment displays
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