In a recent article, BeHardware has investigated a problem reported by their forum users concerning the quality of some LCD monitors:

"Readers started complaining of darker zones on their screens and imperfect color homogeneity. More specifically, unified images were darker in the upper area of the screen than on the lower area."

After some thinking, no sort amount of research and several conversations with manufacturers, they came to the conclusion that the root of the problem lays in the Film added to TN screens in order to get a wider viewing angle:

"[...] due to economical reasons [some] panel manufacturers have put poor quality films on certain more economical panels. This can result in serious problems in light diffraction."

The manufacturers spotted so far are Samsung and AU Optronics. MVA, PVA, ASV and IPS panels are not affected by this anomaly because they don't use this film.

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