removing image persistence from a lcd monitor

i've had the same background image on my lcd at work for a few months and every time i work on a blank word doc, i've noticed that i can see a ghostly after image in the white space. i don't have a screen saver because i thought that lcd's were immune to the screen burn problems that plasmas and crts have. a quick google brought me to this simple lifehacker tip to create a all white background and use it as my screen saver. i started using it today, so i'll report back on it's effectiveness.