Dell D620 Monitor

After a month using my Dell D620, I've just notice that my Dell monitor is a little blurry. I found out about this last night when I put my D620 next to my friend Laptop. I've tried to maximize its brightness but it still looks blurry. I've checked on the driver I've installed and everything seems to be alright. I'm planing to put a cristal layer coat for my monitor and hope it'll help.