Originally Posted by joblack
Exactly but the light originates from the side. So it's a sidelight.
It is a sidelight only when it is in landscape mode. In the default portrait mode it would be a bottom light, as ixtab
But the light guide surface layer redirects that light source inward onto the eink layer, from the front. So technically, the eink is frontlighted from a redirected bottom light source.