My wife noticed the other day that when you stand in front of the TV and look down at the screen there is a small patch that is about an inch long and a 1/2 inch wide that is white. However as you sit down the patch disappears and from a normal viewing distance the area disappears. I had never noticed it before and you can’t miss it now when you wipe the screen off. Any ideas on what this is? I bought extended warranty for the TV, is this something I should be talking to Hitachi About?