Originally Posted by
Synthaxx
Response time and refresh rate aren't the same thing. Response time is how long it takes the screen to react to information being sent to it through one of the monitor inputs (or to be technically correct, how long it takes for a pixel to go from one colour to another and back again), refresh rate is how many times the screen is 'repainted' with new image data. The screen is refreshed regardless of what's going on, it's a mindless process. Repainting with new data is an intelligent process, and only happens when something on the screen has changed.
TN are good at high refresh rate, but poor at response time. They're also modest (at best) with colour representation, contrast and viewing angles.
IPS are good at response time, but poor at high refresh rate (such that high refresh rate on IPS panels isn't even out there yet, not without overclocking your monitor - rather risky). IPS are extremely good at colour representation and viewing angles.
A TN panel might have a 70° viewing angle before you get colour and gamma shifting, a 1:1000 contrast ratio, 120Hz refresh rate, and 8ms GTG response time. An IPS panel on the other hand, might have 178° viewing angle, 1:1000000 contrast ratio, 60Hz refresh rate, and 2ms GTG response time.
The viewing angles of IPS panels are so good that I can look down almost the edge of mine, and still make out elements on the other side of the screen. In fact, reflections from the room are what really stop me from being able to view it from anything above 175° angles. There's no colour or gamma shift. With the TN panel, I can still view from a high angle, but gamma and colour shift start to happen around 120°. On some older panels, it'd actually cause the image to appear negative, and in some cases it was so bad that this would happen in the corners of images even if you were looking at the center of the screen. These days, TN panels aren't so bad, but their colours and contrast are still a world away from IPS.
If you're playing high-rate games such as Quake (or quake-based games), CS 1.6, or even racing games, a TN panel at 120hz+ is superior. If you're playing slower rate games like WoW, LoL, SC2 or even BF3, then IPS is a nicer choice particularly due to the colours. Movies are also nicer to watch on IPS screens.
I've played WoW, SC2, and BF3 on both TN 120Hz and IPS 60Hz and in all 3 cases, I prefer the IPS panel. Admittedly, the resolution of the IPS panel is higher, but I'm speaking regardless of that (since UI scaling in all 3 games makes elements the same size). What looks white on the IPS screen looks cream on the TN screen (at default settings on both).
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