Originally Posted by hwlester
The difference is that the 700 was a backlit eink reader while the current generation readers are front-lighted. You have to remember that Sony was one of the first to market with an eink reader and backlighted LCD readers such as the RocketBook were common at the time. They were ahead of the curve, but it wasn't quite the right idea.
The 700 was a front side lit eink reader, just like the current readers - you can't have backlit eink by definition - eink screens are reflective not transmissive - the 700 just needed further work and refinement to improve the technology but others have done it instead...