> misconception that the light from reflective displays like eInk is somehow different from that of emissive displays like LCD or OLED. Light is light. There i

> misconception that the light from reflective displays like eInk is somehow different from that of emissive displays like LCD or OLED. Light is light. There is one specific difference between the light from LED screens vs e-ink : polarization. LED displays work by adjusting the polarity of the backlighting and then passing it through a polarizing filter. An e-ink display image is unpolarized light. It's not clear whether the polarity of LED has the potential to cause eye strain or other negative effects, but it is certainly a quantifiable difference.