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> through a light guide to come from behind the text.

What does that even mean? The nature and the underlying physics of the light hitting the cornea of your eye doesn't change or depend on how or where the rays of light originated. I know a lot of e-reader folks try and upsell 'behind the text' but that's not how it works.

Light always has to reflect or radiate off of a surface from the front.

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>Light always has to reflect or radiate off of a surface from the front.

And in the case of the Kindle, the light reflects off of the pigment layer from above, rather than radiating directly from a light source behind the pigment layer. GP's comment just contains what amounts to a typo. The light guide is in front of the text, not behind it.

It's a description of the mechanism that delivers light of unchanged nature and physics to your eyes.

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