16 levels of grayscale support.
> How bad is the ghosting?
Ghosting depends on the mode you're using and the content.
> How white is the background?
Varies, depends on the panel you're using.
> Is it clear enough to be used white-on-black?
Yes
> How often does it need a full screen refresh?
That's up to you; you can manually clear with a button press, use auto-clear mode, or programmatically control it.
https://www.youtube.com/watch?v=AoDYEZE7gDA&ab_channel=Modos
> Ghosting depends on the mode you're using and the content.
>> Is it clear enough to be used white-on-black?
> Yes
I agree that the dark mode on the boox is terrible (I find for example obsidian absolutely unusable). But this could be easily fixed with bolder fonts.