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Old 09-04-2007, 03:20 AM   #1
TadW
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Study on ergonomics of e-paper

While I don't have access to the PubMed, here the abstract of an interesting paper that explores the optimal viewing distance and screen angle for e-paper (emphasis mine):

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Data analysis showed that the mean viewing distance and screen angle were 495 mm and 123.7 degrees. The mean viewing distances for Kolin Chlorestic Liquid Crystal display was 500 mm, significantly longer than Sony electronic ink display, 491 mm. Screen angle for Kolin was 127.4 degrees, significantly greater than that of Sony, 120.0 degrees. Various light sources revealed no significant effect on viewing distances; nevertheless, they showed significant effect on screen angles. The screen angle for sunlight lamp (D65) was similar to that of fluorescent lamp (TL84), but greater than that of tungsten lamp (F). Ambient illumination and E-paper type had significant effects on viewing distance and screen angle. The higher the ambient illumination was, the longer the viewing distance and the lesser the screen angle. Character size had significant effect on viewing distances: the larger the character size, the longer the viewing distance. The results of this study indicated that the viewing distance for E-Paper was similar to that of visual display terminal (VDT) at around 500 mm, but greater than normal paper at about 360 mm. The mean screen angle was around 123.7 degrees, which in terms of viewing angle is 29.5 degrees below horizontal eye level. This result is similar to the general suggested viewing angle between 20 degrees and 50 degrees below the horizontal line of sight.
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Old 09-04-2007, 07:36 PM   #2
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127.4 degrees is "significantly greater than" 120.0?
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Old 09-04-2007, 07:47 PM   #3
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It is probably significantly greater than the mean variation within a group. For example, if the variations within a group were only about 1 degree, then finding a difference of 7 degrees between the groups would be significant. I haven't read the article but I'm assuming they got a bunch of people to read from the displays and they measured the distance and angle they held it at. And actually, considering that there's only a 90 degree difference between holding it flat and holding it vertical, 7 degrees does seem like quite a bit. I wonder what the difference was?
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