It's pre-genesis to believe that; BUT the more often you turn your monitor on/off the more it will degrade. Someone mentioned lightbulbs; but the fact is most components degrade when they go from a hot to a cool state; parts expands when hot and contracts when cooling. Take a paper clip and bend it back and forth rapidly a few times, and the heat produced will make the clip break; same thing with a monitor or comparable fluorescent light ballast.
The best way to save your monitor is to put it in energy saving standby mode; you'll save hydro ( ~$100/yr) depending where you live probably save enough to pay for your next screen.
The best way to save your monitor is to put it in energy saving standby mode; you'll save hydro ( ~$100/yr) depending where you live probably save enough to pay for your next screen.