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Originally Posted by fjtorres
No, it is not just about the light levels.
The path matters to the polarization of the light.
LCd light is uniformly polarized while ereader scattered light is a random mixture of polarizations. Try looking at an LCD through polarized glasses.
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Perfectly true, but I'm pretty sure that the human eye can't detect polarisation, can it?
Quote:
Another thing that matters is that ereader front lights use unfiltered LEDs which is why the hue varies from unit to unit. Some yellowish, some faintly green or occasionally blue. LCD backlight, however, always runs through filters: red-green-blue.
white backgrounds on lcd always put out blue light which is what the software filters do: they mute the intensity of the blue pixels. Because about a third of thelight coming out of white sections is pure blue.
The actual amount of blue light will vary depending on design so you can't really use measurements from one iPad model to another much less other brands. And applying those measurements to an entirely different lighting system is just bad science.
The blue light effect is real but it is primarily a color display issue.
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I fully accept your point, but I really do think that this is first and foremost an issue with many tablet users having the backlight set too high in dim light (or, indeed, the tablet's firmware not allowing the light level to be set sufficiently low).