[Valentinka]

Originally Posted by mod186k1

Yeah: I suppose it was written by a users named here "Nate the great"

You can see his posts here:
https://www.mobileread.com/forums/sho...d.php?t=167816

mod186k1,

I don't know if this is the same user or not. But here (http://www.the-digital-reader.com/20...inting-screen/) he clearly states:

Guess what I think of the hardware?

First, the screen is gray. It’s so gray that I plan to call this ereader Dorian.

It’s not the pale gray that you might see on the Nook, Kindle, or other ereader. No, the JC screen is so gray that I think it is darker than the screen on the original Kindle. It is certainly darker than the screen on my Kindle DX...

Next, the screen refresh rate is slow. It’s not just slower than any of my 6″ ereaders; it’s also slower than my Kindle DX (the 2010 model). The KDX can refresh the screen at nearly twice the speed of the Jetbook Color. I have no word on when this will improve, but I hope it will be addressed in an update.

Finally, yes, the JBC does have a color E-ink screen. Unfortunately, the dominant color is gray. No other color is nearly as strong.

Also one of the comments there states:

JBC, as any other e-reader based on e-ink technology, has not backlight. Since its screen has a gray color so dark, white backgrounds are also shown as dark grays. In my opinion, JBC doesn’t have the proper contrast for reading e-books. The severe lack of contrast causes eyestrain after one hour or two — ironically, people buy e-readers instead of LCD tablets to avoid eyestrain!

But maybe it’s just me.

I would say it's not just him...