Quote:
Originally Posted by HarryT
For me personally, the point at which I stop being able to tell the difference on a reading device occurs somewhere between 250 and 300ppi. I could see a clear difference in smoothness going from a 167 to a 260ppi screen, but no improvement going from 260 to 300.
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It also depends on display technology, font hinting, anti-aliasing etc. Even 200 dpi in one bit monochrome is ghastly. Yet 122dpi on an LCD with sub-pixel addressing, anti-aliasing and good hinting can look about the same as 300 dpi on eInk for sharpness, though even a 167dpi eink is less tiring to read for two reasons*
The eink has no sub-pixel addressing and very poor ability to do anti-aliasing as the 6 to 14 shades of grey between black and white are problematic. So eInk, like a sharp laser printer benefits more from higher resolutions than full range colour/greyscale screens.
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1) Ability to hold it at your own ideal distance, tricky for a Laptop or PC, though possible with a phone or tablet.
2) Ambient light illuminated displays are easier on the eye than light emitting. Even an eInk front light is poorer than decent ambient light.