Will never letting my display go to sleep shorten its life? In Mac OS X 10.9's System preferences > Energy saver, there is a warning that says:


  Never letting your display go to sleep may shorten its life




Why would not letting my display go to sleep shorten its life?

What monitors are effected by this warning?
Realistically most Mavericks-capable systems with built-in displays, other than the early aluminum iMacs and Santa Rosa Core 2 MacBooks, have LED back-lighting which isn't going to noticeably dim with age or be affected by on/off cycling.

If you're driving a CRT/plasma/CCFL-LCD monitor then you have option of increasing the lifespan of the display phosphor coatings (the back-light in the case of CCFL-LCD panels), but this comes at the cost of increased stress on the driving electronics of being regularly cycled on and off.