In addition to using older technology, it's also possible that the Kindle makes different tradeoffs in terms of speed/contrast/ghosting/resolution. Personally,

In addition to using older technology, it's also possible that the Kindle makes different tradeoffs in terms of speed/contrast/ghosting/resolution. Personally, when reading, refresh speed is the property that I care least about among those four. I'd be surprised if engineers couldn't improve refresh speed when designing a panel for a laptop instead of an ebook reader.