Abstract— Two composite metrics to characterize display reflection, contrast, and readability under daylight illumination is proposed. A measurement of the reflection under directed illumination simulating the sun is combined with a measurement of the reflection under uniform diffuse illumination to simulate the sky. The measurements are performed separately in a laboratory, and then the measurement results are combined and scaled to daylight levels with attention to the proper spectra involved for the skylight and sunlight.

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The amount and type of pixel defects on a small high‐density display were varied to find out how the defects alter visual performance. The effect of character weight on the decrements caused by pixel faults was of particular interest. Visual performance was examined by using the Pseudo‐text search task, and subjective evaluations of visual comfort and defect visibility were included. The results provide further evidence to the former finding that, even though noticed, a small number of defects do not decrease visual performance. Furthermore, increase in vertical thickness of the displayed characters reduces the decrements further.

This paper summarizes the activities of ISO TC159 SC4 WG2 in the field of measurement of display reflectance as required for rating of ergonomic display performance since 1995, covering ISO 9241‐7, 13406‐2 and the series 9241‐30x. The shortcomings of the methods are introduced and improvements are proposed. We also summarize the state of measurement methods for reflective displays in general in IEC TC110.