Extending LCD Display Life?

polymath69 asks: "I use a laptop as my primary home machine, and wish the display to last as long as possible. There are two main camps of opinion on how one ought to ensure this, each grounded on a seemingly logical point. Opinion One goes like this: An LCD's backlight is only going to emit photons for some number of hours, therefore shut it off when not in use to maximize life. Opinion Two counters: A backlight can only be turned on some number of times, therefore leave it on to maximize life. The conclusions in each camp are diametrically opposed. So what is the truth? And how do you make a choice when two seemingly irrefutable arguments are in disagreement? Both these truths start from the same given: that eventually, the LCD will fail. But looking at that given from two points of view leads to contradictory answers. Now, one of these arguments has got to prevail. But which is it, and why?"