Originally Posted by wallcraft
All the current crop of 6" screens are from the same source (PVI) and use the same Vizplex E-Ink film.
Correct, however there are differences in the controllers used to control the display. iREX uses there own which support 16 gray scales levels. Sony uses an advanced one that support 8 gray scale while everyone else is using the original controller that only supports 4 gray scale levels.