Laptop displays performance: Compliance assessment with visual ergonomics requirements

Francesco Leccese,Michele Rocca,Giacomo Salvadori,Merve Oner,Chiara Burattini,Fabio Bisegna

doi:10.1016/j.displa.2021.102019

Francesco Leccese, Michele Rocca + Show 4 more

Open Access

https://doi.org/10.1016/j.displa.2021.102019

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Abstract

The use of display devices such as smartphones, tablets, laptops is now massive and continuous in everyday life. It, therefore, becomes increasingly important to be aware of the performance of these devices, not only in terms of the tasks to be performed but also in terms of interaction with humans and therefore knows any possible effect on the ergonomics of vision. Following previous research activities conducted by the authors on the assessment of the visual ergonomics at video display terminal workstations, the aim of this study is to evaluate the ergonomics of human-system interaction of laptop displays. In details, a sample of 57 laptop displays is analyzed in accordance with the requirements of the EN ISO 9241-3xx series of international standards related to the display luminance, luminance ratio, contrast non-uniformity. An extensive luminance measurement campaign was carried out using a special pattern that allowed to measure the luminance in 13 different areas of the displays. The results obtained with this activity showed a great luminance variability between different displays. Almost all the displays are able to emit high levels of display luminance, and almost all the displays meet the requirement of contrast non-uniformity. However, several devices did not meet the recommended values of luminance ratio. Furthermore, the authors created a simplified graph to allow a rapid evaluation of the performance of the displays. This method could be periodically used in practice in order to evaluate the residual performance level.

Highlights

Over the last few decades, electronical devices have become inherent elements of people in many aspects of everyday life, such as working, communication, entertainment, e-shop and education [1,2,3]
Two box plot charts were created: one for the B100 configuration (Fig. 4a), and one for B50 configuration (Fig. 4b). In these graphs for each display, a box plot was presented in accordance with the recorded luminance values and a black dot corresponding to the average value of the lumi nance detected on the white targets
The results showed in this study are part of a larger project on the evaluation of the visual ergonomics of workstations with video display terminals, where these workstations have been analyzed using different scales of detail and using different investigation techniques

Summary

Introduction

Over the last few decades, electronical devices have become inherent elements of people in many aspects of everyday life, such as working, communication, entertainment, e-shop and education [1,2,3]. Following the increase in the use of these devices, the effects on users’ well-being have started to be investigated; several researches have been conducted on the ergonomics [5,6], lighting [7,8], possible visual health effects [9] and circadian rhythms [4,10,11] in terms of their use It is, a current trend to simultaneously consider multiple aspects, as occurs in the assessment of the lighting quality of the rooms [12], in order to obtain the holistic vision of the device users’ exposure conditions [13]. The display can be considered as a light source placed close to the observer’s eyes (40 - 80 cm) and it may affect the quality of the visual performance and any effects on health and well-being [14,15,16,17]

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