3D Vision Blog

A normal user's look into the world of 3D Stereo Technologies

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Testing the Asus VG236HE 120Hz 3D Monitor, it Has Some Input Lag

November 3rd, 2010 · 9 Comments · Other S3D Tech

After some delay I’ve finally gotten my hands on the Asus VG236HE (the version without bundled 3D Vision glasses) which is the same in terms of hardware and performance as the Asus VG236H which comes with the shutter glasses bundled. As you probably know the Asus VG236HE is one of the latest 120Hz 3D-capable LCD monitors compatible with Nvidia’s 3D Vision technology, but what sets it apart from all other such products is the fact that this is the first 3D-capable 120Hz LCD monitor with a glossy screen, as all others so far were with matted screens (apart from the 120Hz LCD panels used in 3D-capable laptops that are also glossy). Now this kind of reflective coating over the screen can create some reflections when darker image is being displayed and some people do not like that much, although more and more monitors in general are being made like that, but you can get used to that or just avoid it by choosing another product. But I’ll leave that for when I’m ready with the whole review of the monitor, and for now let me just show you how the monitor performs in terms of input lag.

I’ve decided to compare the Asus VG236HE to the LG W2363D-PF I’ve recently tested, as this model from LG is so far the only Full HD 3D-capable 120Hz LCD monitor that I’ve tested and that does not have input lag when the special THRU Mode is active. So far the only model from the second generation of 3D-capable 120Hz LCD monitors that I still haven’t been able to test is the Alienware Optix AW2310, which apparently also does not have any input lag according to some reviews I’ve read. So dusting off my DVI splitter cable I connected both the Asus VG236HE and the LG W2363D-PF and started testing for input lag with the LG in its THRU mode and the Asus set in its gaming mode…

As you can see from this photo, there were moments when the LG and Asus were performing the same, meaning that there was no input lag at the specific moment, unfortunately the situation was not like that all the time. The minimum input lag measured on the Asus was indeed 0 milliseconds, meaning no delay at all from the moment of receiving the image and displaying it on the screen, however the average and maximum delay was more than zero.

The maximum input lag I was able to measure was 17 milliseconds which is not that bad, but for a high-end gaming monitor with 120Hz refresh rate and intended for playing games in stereo 3D mode one would expect to have no input lag at all, right?

And the average delay measured was about 8 milliseconds for the Asus as compared to the LG, that has no input lag at all or at least it is much less than one millisecond making it really insignificant and hard to measure anyway. So 8 milliseconds was the average input lag measured from the sequence of over the 300 photos, taken in high-speed mode with a digital camera, of the timer you see shown on both displays to measure the input lag. So the Asus doesn’t have so good start, especially for gamers looking to use it in 2D mode with the full 120Hz refresh rate, but lets see the more important part – how well it performs in stereo 3D mode. That however you will be able to soon read when I’m finished testing the monitor in a few days… ;)

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A Little About the Input Lag of the LG W2363D 120Hz LCD Monitor

June 27th, 2010 · 24 Comments · Other S3D Tech

I have been testing for some time already the 23-inch LG W2363D 120Hz LCD monitor, of course focusing mostly on its performance in stereo 3D mode. A more detailed review of the display is coming soon, but meanwhile I’m going to share with you some important information regarding the input lag that the LG has or actually doesn’t have. The input lag of a display does not directly influence the quality of the image you get or create issues when playing in stereo 3D mode, but the presence of input lag is not desired by gamers, because it leads to slower reaction time and thus may lead to worse results in more competitive and especially multiplayer games.

Unfortunately I was not able to get a Acer GD245HQ/GD235HZ monitor to compare directly with the LG W2363D, so I did the comparison with the Samsung 2233RZ instead, but as I’ve already compared the Samsung 2233RZ and ViewSonic VX2268WM and found they both have the same input lag, and that input lag is almost identical to that of a good CRT display (meaning input lag of less than 1 ms if there is any at all). On the other hand the Acer GD245HQ/GD235HZ monitor has between zero to about 15-16 ms input lag delay compared to the ViewSonic and all this can help a lot in judging the results I got from the LG below, so pay good attention…

The LG W2363D monitor has a special mode called THRU Mode that has the sole purpose to eliminate any input lag when activated, but before trying if that mode really works and if it does – how well it performs I’ve tried the input lag without it being enabled. The minimum input lag I’ve managed to get with the THRU Mode disabled was 9 milliseconds delay as compared to the Samsung monitor.

And after taking a long series of photos with an exposure time of 1/1000th of a second and high ISO setting the maximum input lag I was able to measure was about 18 seconds. Have in mind that these tests are performed with the use of a DVI splitter cable instead of connecting the two monitors to the two outputs of the video card and using a clone mode as my tests confirm that using the clone mode does not provide accurate results as compared to using a single monitor output with a splitter cable. So far these results can be considered worse than what I’ve managed to get from the Acer, so lets see how the THRU Mode on the LG works and will it be able to do some wonders in getting rid of the input lag…

Enabling the THRU Mode on the LG completely eliminates the the input lag on the LG, bringing it down to exactly the same results the Samsung is showing. So the THRU Mode on the LG does exactly what it is supposed to do – eliminate the input lag completely, but you need to enable that mode in order to have no input lag as some people will most likely forget to do so every time they need it. So you should enable it right from the start and forget about switching it off again…

The good news is that whenever you switch to 3D mode the THRU Mode is automatically being enabled and you are unable to switch it off until you are back to normal mode again, so there is no input lag while playing in stereo 3D mode and that is a good advantage for the LG. And there is another advantage of the LG that you’ve probably already noticed in the photos above and that is the higher brightness of the LG (400 cd/m2) compared to that of the Samsung (300 cd/m2).

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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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