Hii Sai..
Even i have the same problem while watching videos.. Rings/Fringes appear in case of a bright object or bright light..
My problem: Problem with Viewsonic VX1932wm LCD
Toll free number of VS. 1800 11 99 99.
Call, give details and the sl. number of the monitor and you will get the RMA number. The monitor will be checked/taken for service the next day or so.