From what I can gather, there have been several versions of the Touch: N905, N905B and N905C.
I have a N905B and it has a good Pearl screen and is a bit superior to the Vizplex screened Kobo Mini I also own, in terms of background colour. But look at this photo
http://goodereader.com/blog/uploads/...1-1024x459.png That doesn't just look like the white frame effect, the Touch looks a lot darker.
Did maybe early Touches use a different screen?