For those interested to see the screens of Boox and Kobo side by side I took two pictures in the same conditions, loaded into Photoshop and converted them to grayscale.
If you open the Info Window in Photoshop and hover the mouse inside the black rectangle added to each picture, you see grayscale ranging from 28 to 32% for Boox, and from 23 to 27% for Kobo.
I think mr. Dulin is right, and I also found that minor differences may occur even in the manufacturing process of different Vizplex batches.
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