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Alas, the response time of the SyncMaster 173P+ is poor. The curve jumps suddenly up on dark colors like with a typical PVA matrix.

The response time has improved over the ordinary SyncMaster 173P, but not very much (the graph above shows you the pixel rise time for the sake of simplicity). Still, this monitor does have an RTC block and the block does work as can be seen on oscillograms. You see one below – it shows the pixel brightness graph during a transition from black to 50% gray (the color RGB {128; 128; 128}).

Note how quickly the brightness grows up at the beginning of the graph. But after about 15 milliseconds the graph changes into a small horizontal ledge and then into a slow rise, typical of PVA matrixes. Here is the oscillogram of the same transition on the SyncMaster 173P:

This monitor doesn’t have RTC. There are no sharp turns in the graph, but the pixel brightness is growing up smoothly. So we have made sure the SyncMaster 173P+ is really equipped with RTC as confirmed by the characteristic look of the oscillograms. Secondly, the RTC mechanism of this monitor is insufficiently aggressive. The acceleration impulse is too weak and it ends much sooner than the pixel reaches the desired brightness (the moment the rapid brightness growth stops at the 15th millisecond is exactly the moment the compensation impulse ends). Thirdly, the “ghosting” effect on the 173P+ is not only weaker than on the 173P but also shows up differently. It looks not unlike the afterglow on CRT monitors where there is a barely visible but relatively long trail after a white object that is moving on a black background.

On the 193P+, the improvement just strikes your eyes! Although this monitor is still rather slow on dark tones (this is especially clear on the 3D histogram you have seen in the Introduction section), the response time graph goes down suddenly towards the light tones, rather than smoothly as on the older 193P. As a result, the pixel rise time does not exceed 15 milliseconds on most tones and is as low as 9 milliseconds at the minimum. By the way, make note that the response time minimum does not necessarily fall on the black-white transition for monitors with RTC.

I won’t give you an RTC error graph for these two monitors because there were no obvious errors on black-gray transitions (an RTC error is a too-high overdrive impulse that leads to the white-shadow artifacts as described above). A more detailed examination reveals that there appear some errors on gray to gray transitions, but they are very small, below 10%. The maximum observed RTC error was 16%. So, although the monitors are not absolutely free from the RTC-provoked artifacts, such artifacts are not visible at everyday work unless you are looking for them on purpose.

 
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