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Moving your position vertically in relation to it. If it is TN the colours change dramatically as your point of view goes up and down. Whites become dark greys, blues become purples, that sort of thing.
 
You can also look up the specs, if the viewing angle is like 178 degrees then it is not a TN. TN panels have around 160. You can also usually tell by the price, if the price is really low for a large monitor then its probably TN.

That monitor you link to has a 160 degree viewing angle, so it is a TN.
 
TN panels tend to be brighter towards the bottom. Take a mid level grey and look at it at the top, then see if it's anywhere near the same shade at the bottom. If it's not, it's TN.

I probably wouldn't have one again... it's irritating once it's been pointed out.
 
TN panels tend to be brighter towards the bottom. Take a mid level grey and look at it at the top, then see if it's anywhere near the same shade at the bottom. If it's not, it's TN.

I probably wouldn't have one again... it's irritating once it's been pointed out.

What are Apple Displays? (as in ACD's?)
 
Not sure what the technical term is for the display in the ACDs, but they're certainly not TN's. They're real decent quality, that's why they cost so much.

TN is only used in cheap PC screens, and the 20" iMac.
 
http://www.behardware.com/articles/686-8/review-of-the-dell-2407wfp-hc.html

That place has photos of the different display types. PVA is acceptable but not as good as IPS which is practically perfect. TN is completely unacceptable and basically garbage, it literally inverts the picture, at mid viewing angles its half inverted which makes things illegible. I would only consider buying a monitor that is IPS or PVA.

The only advantage TN has is for gaming, they have a very low response time. You wont really notice the crappiness of TN when playing a game. TN's are fine for TV's though, you sit so far away that the viewing angle is not such a problem and youre always dealing with video.
 
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