Originally Posted by yts06mgr
Sony uses E-Ink Pearl. Check Sony's press-release and product information on their web pages. I don't think 'Pearl' is a trademark and it is the technology name for an ehnacement of Vizplex(tm) Imaging Film, so maybe trademark-wise Vizplex could still stay.
I have both Kobo and Sony PRS-650 and Sony's display is better, period.
Yes, the thought had just crossed my mind that maybe 'Viplex' is just a usual part of e-ink so I went to google about it; I couldn't find anything very recent though. But I'm guessing you're correct.