Originally Posted by DrMoze
Err, your math is off. 4"x6" is barely over 7" diagonal. (Check your Pythagorean Theorem.)
The 6" e-ink displays are close enough for the OP's wants.
A 10" diagonal would correspond to, for example a 6" x 8" display, which is huge.
Duh me. Yes, I realised this as I fell asleep last night.
Ignore me, or at least my maths...