the flying biscuit wrote:What does not being back lit mean.....?
I want one for my missus, she has a bad habit of reading books in the dark, like on long car journeys at night.
Is 'not being back lit' like reading a digital watch screen, ie ok in light conditions but needs illuminating in the dark....
If so that would defeat the object and i'll buy her a clip on lamp for her book and save about £78 quid ...!
Backlighting and how this works in a TV is quite complicated. LCD displays do not produce thier own light and must have a light source behind them. This causes problems for any mobile device with regard to battery life. Plasma and LED displays are different, but I don't think that's what you are asking.
Kindle uses a system called e-ink. Each pixel contains two charged pigments, black and white. It is possible to change the colour of each pixel on demand from white to black, or vice versa. Once done, very little energy is required to maintian the page. It basically reprints the page everytime you turn over. You can think of it in the same way as a page on a conventional book. It is very light as only a tiny battery is required, and it will last over a month between charges.
Other readers produce the light that enters you eye, this means that they are visible without an external light source. They do have the problem that when exposed to a intense external light source, like on holiday, the sunlight that reflects off the screen makes them unreadable. The Kindle doesn't suffer from this, as the image reaches your eye in the same way as a conventional book. It does wonders for your baggage allowance also.
The down side that you mention is that you need a small light source to illuminate the device in low light. But that's just the same as a book, so no hardship there.
Comes down to cost then, new ones are £89. That's about the cost of 15 new books. Add to that, there are so many legit sources of free kindle books, I've saved loads over the time my wife has owned one. Some unscrupulous individuals post anthologies on dodgy wesites, but I'm not into that.