Turning Off a Laptop Screen

I have a laptop running FreeNAS. I can turn the backlight off completely, but cannot do the same for the actual LCD panel. Does anyone know how to turn off the actual panel? Does leaving the panel on significantly shorten the lifespan of the monitor?
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More about turning laptop screen
  1. I don't believe you can actually power off the panel w/o shutting down the laptop. Best advice I can give is to set your power settings to turn off the dispaly after idling for a period of time. I would also close the laptop as well while it's still running.
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