Last Saturday I bought PHILIPS blade 224CL2 LED monitor ( 21.5 inch ). Everything is good when I am viewing directly at the screen at the normal 90 degree angle while sitting on my chair. But as soon as I stand up and view the monitor - the white background of windows explorer or a web-page appears as light green. Is this normal ? I mean do these LED monitors have this kind of problem ? Before this, I had a proview 22 inch LCD monitor and I never had a problem like this while using it!