I made some macro shots of E Ink Vizplex (4 gray levels) display. Maybe someone will find them interesting:
Full size:
http://s.wieze.org/wieza/gfx/makro.jpg
http://s.wieze.org/wieza/gfx/makroeclicto.jpg
As you see the white background is not exactly white. Shows some dark speckles.
Photo camera used: Olympus E-520 with macro lens and additional macro converter. No flash, so it was very hard to keep still (and above photos are two of the 50 or so bad ones

).