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As for Readers with a light and without, my Kobo Aura H2O has better contrast then my Sony Reader PRS-T1.
The T1 has no light and IR touch. The H2O has a light and IR touch. The T1 is Vizplex and the H2O is Carta. The T1 is 167DPI and the H2O is 267DPI.
On the H2O, the light is not a layer. It's 5 LEDs at the under the bezel at the bottom of the screen. What can cause some loss of clarity is the use of a capacitive touch layer.
Amazon took the PW3's touch layer that was against (or very near) the screen and raised it up so the bezel would be flush (for the PW4) and in doing so, lost some clarity and contrast.
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