Next goes the PVA technology represented by the Samsung SyncMaster 194T monitor (without RTC). PVA matrixes are generally very slow on transitions from black to dark-grays which may take as long as 100 milliseconds and more. This makes such matrixes unsuitable for dynamic games, of course. The diagram above agrees with what we have seen in our previous reviews: the transitions from black to dark-gray took as long as 90 milliseconds and was lowering towards the lighter tones. Yes, the monitor is quite fast on gray-black and gray-white transitions, but its average speed is going to be awful.
And this is the same PVA matrix with an RTC block added. The difference should strike your eyes – the Samsung engineers did not only manage to remove the tallest peak which remained almost unchanged. The second peak to the right is much lower, though, and the response time on the rest of transitions is on the same level (about 12 milliseconds and lower) rather than slowly declining as before.
Unfortunately, we could not find an RTC-supporting monitor on an MVA matrix to compare it with PVA.
Lastly, here is the S-IPS technology represented by the LG Flatron M173WA. Although the monitor is declared to have a response time of “12 milliseconds g-t-g”, its matrix does not use RTC. This is an ordinary S-IPS, but marked in the new fashion. On one hand, the diagram confirms the statement that a 25ms S-IPS isn’t any worse than fast TN+Film matrixes (the diagram of the ViewSonic VG712s above looks roughly the same), but it cannot compete with the new TN+Film matrixes with RTC. You don’t have much choice if you like S-IPS monitors – there are yet no S-IPS models with response time compensation on the market.
You may have noticed that 3D histograms do not bring any additional information over 2D graphs. The conclusions that can be drawn from 3D diagrams (that the specified and real-life speed of older TN+Film matrixes differ greatly, that PVA matrixes are very slow on some kinds of transitions, and that S-IPS and TN+Film deliver roughly the same speed) can be drawn from 2D diagrams as well. However, it is difficult to compare monitors between each other using 3D diagrams, so I will still offer you 2D diagrams of black-gray-black transitions, reserving the 3D format for special cases.
But enough of theory, let’s get closer to real monitors with response time compensation. There’s only one thing left to note: the RTC mechanism affects moving objects only and has no effect on the static image, i.e. on color reproduction, viewing angles, contrast, etc. So besides the response time alone, there is no difference between an RTC-less monitor and a monitor on the same matrix, but with RTC.
TN+Film and PVA matrixes are currently employed in 17” and 19” models, so many manufacturers introduced their RTC-supporting monitors in pairs. The two monitors in such a pair differ only in the size of the screen and are identical otherwise – I will discuss them in twos. As for MVA technology, AU Optronics, the manufacturer of MVA matrixes, only targets screen diagonals of 19” and higher.