I like digitial clock, but worried if leave on all night it charging will it damage the screen and cause dead pixels?
I believe I read somewhere that the average LED backlight is rated at 60,000 hours, which is 2500 days or 6.8 years. That's running it every day, 7 days a week, for 24 hours a day. By then you'd have replace your iPhone/iPod Touch.
However, I think the part that will go out first is the battery, which is non-replaceable. If you leave it in the dock, I don't think it will harm the battery life.
Of course, this is speculation on my part. Perhaps an Apple engineer could better answer this question.
That might be true for LED.. but the iPhone uses micro-CCFL tube lighting for the LCD panel...
I think you should be more worried about the device melting. I tried to warn Dali but he wouldn't listen.
I was just looking into this issue and found this thread. It looks like the conclusion is that using the iPhone as a bedside clock replacement is a safe bet. If anyone has further input, please post.