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ViewSonic VX2268wm has Just a Bit more Input Lag than a Good CRT

November 8th, 2009 · 17 Comments · Other S3D Tech


My second video splitter, this time compatible with analogue displays arrived so I took the opportunity to connect the ViewSonic VX2268wm along with the good old Samsung CRT to a single video output of the card in order to test for input lag. As I already said in the article Samsung 2233RZ and ViewSonic VX2268wm are With the Same Input Lag and based on my previous experiences, testing with two displays connected to the two outputs of a video card and using a clone mode does not give accurate results – they simply vary too much! So in order to compare displays and have an accurate judgment on the presence or lack of input lag you must use a passive video splitter that is capable of splitting a single video signal to two displays. If you try to use an active splitter (with its own electronics and needing external power) you can again get inadequate results as this additional hardware may or may not introduce input lag too…


So, now lets get to the point where I compare the 120Hz LCD and the CRT display, using the analogue splitter cable. The following pictures were taken with 1/1000th of a second shutter speed, so that the camera can register even a 1 millisecond delay between the two monitors. At first look the numbers on the counter look the same on both displays, which is good, but the second and more detailed look reveals the fact that the millisecond counter on the LCD does not show absolutely clear numbers as on the CRT.





As a result of this test I can conclude that in fact there is a very little input lag on the 120Hz LCDs like ViewSonic VX2268wm compared on what you get on a good CRT display, but still there is some, even if it is very little. Now I’m talking about a very minor input lag and by that I mean something like 1 or 2 milliseconds at most, but then again we can also consider that the “ghosting” of the numbers on the LCD can also be caused by the slower response time of the pixels – taking pictures at 1/1000th of a second while the response time of the pixels is at 3-5/1000thof a second. But anyway to answer the question if a 120Hz LCD display is a good alternative to a good CRT display I can already say they perform as close as possible in the critical areas like input lag or the lack of such, but the LCD also has some clear advantages over the CRT technologies. So if you consider replacing your gaming CRT monitor you should definitely go for a 120Hz LCD, especially if you also consider using this display together with 3D Vision for viewing stereoscopic 3D content.

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