For some people it's less eye straining if they're reading at night, doesn't help for me personally, but it's a popular feature
replyBecause most of the page is dark, with light only coming from the text, the total light emitted is much less. That makes it less annoying to my wife, when I'm reading before going to sleep.
replyEink doesn't emit light.
replythis is the worst kind of pedantic engineer comment that seems to infest this site. they're obviously talking about the frontlight. dark mode reflects much much less light back at the user through the lightguide because the dark bg absorbs more of the light.
replyMany Kindles have backlights for night-time reading!
replyIf you want pedantic ridiculousness, well, notice that I never said that the e-ink emits light. It does, however reflect light back from the device's frontlight. The device taken as a system most certainly emits light, but less so when in dark mode.
replyI have no idea but users seem to like it despite all the ghosting.
replyThe reason I use koreader is because it can sync my progress on disparate devices. I have a normal sized kobo and also a phone sized viwoods eink device.