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3D Vision over DisplayPort 1.1 Interface with BenQ XL2420T or XL2420TX

February 6th, 2012 · 18 Comments · GeForce 3D Vision

The BenQ XL2420T and BenQ XL2420TX are the first 3D Vision-ready 3D LCD monitors that come with support for 3D over DisplayPort 1.1, so you actually have an alternative to using the Dual-Link DVI interface they they are also equipped with for 3D. You should have in mind however that there are some specific limitations and requirements when using 3D Vision over DisplayPort with these displays and you should be well aware of these if you plan on purchasing any of these two displays for use in stereo 3D and that goes not only regarding the use of DP. The BenQ XL2420T/TX are still the only 24-inch 3D Vision-ready monitors that support the new 3D Lightboost technology for providing increased level of brightness when in stereo 3D mode, the other two alternatives are from Asus and Acer, but they are 27-inch models and they do not feature DisplayPort connectivity. The support for 3D vision over display port has been introduced in the R290 video drivers from Nvidia and more specifically in the 290.36 Beta drivers, so it will not work with older drivers.

The BenQ XL2420T is the more affordable version that does not come bundled with 3D Vision 2 active shutter glasses and it also does not feature a built-in IR emitter for the 3D Vision glasses. This is very important, because without the built-in IR emitter you will not be able to use the HDMI interface of the monitor for stereo 3D, even if you connect an external IR emitter to your PC. Using an external infrared emitter for 3D Vision glasses gives you only the ability to use the monitor in stereo 3D mode with a PC over the DL-DVI or the DisplayPort 1.1 interface. This means that the BenQ XL2420T monitor is more suitable for gaming in 120Hz 2D mode or using for stereo 3D content only with a PC, you should not get the T-only version of the monitor if you plan on using it with a PS3 in 3D or any other HDMI 1.4-based stereo 3D-capable devices, because you would not be able to. The HDMI interface present on the BenQ XL2420T monitor is 2D-capable only and you are of course not able to use 120Hz refresh rate over the HDMI, you need to use the other interfaces for the higher refresh rate.

The BenQ XL2420TX is the more expensive version that comes with a built-in infrared emitter and a pair of 3D Vision 2 active shutter glasses, so you are ready to use the monitor in 3D mode over DL-DVI, DisplayPort or HDMI 1.4. Using this monitor over the DisplayPort interface however has some limitations based on the GeForce GPU you have in your computer, so have in mind that if your video card is based on GeForce 8 series, GeForce 9 series, or GeForce GTX 295/280/260 GPU you would still need an external IR emitter to use the monitor over the DP interface. Of course this is only related to using DisplayPort, if you have any of these older GPUs you can still use the built-in IR emitter over the DL-DVI interface. If your GPU is any newer you would be able to take advantage of the DisplayPort 1.1 connectivity with the built-in IR emitter inside the display. And one more thing, currently NVIDIA 3D Vision Surround setups are still not supported over DisplayPort, so if you plan on using a three monitor 3D setup, then you’ll have to stick to using the Dual-Link DVI interface for now.

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18 responses so far ↓

  • 1 Dave G. // Feb 6, 2012 at 22:06

    Does the Display Port interface open up the possibility that future monitors will be capable of resolutions greater than 1920×1080?

  • 2 Bloody // Feb 6, 2012 at 23:51

    Yes, the more recent DisplayPort 1.2 standard is already more than capable for higher resolution and refresh rates, now we just need the panels and the video cards that would be able to provide enough graphics power… ;)


  • 3 Michael // Feb 10, 2012 at 06:12

    Does anyone know if I can I use one BenQ XL2420TX in the center and two BenQ XL2420T’s for the left and right monitors in 3d vision surround?

  • 4 Noob // Feb 22, 2012 at 19:42

    replay – Michael

    Yeah bro Good Question, I’m wanting to know the same question…

    3D Nvidia Surround setup with these new BenQ monitors? ideal setup would be the one that Michael described!

    “one BenQ XL2420TX in the center and two BenQ XL2420T’s for the left and right monitors in 3d vision surround?”

  • 5 Noob // Feb 22, 2012 at 19:46

    One more question!!!

    Can this monitor support AMD 3d Eyefinity?

  • 6 Bloody // Feb 22, 2012 at 21:02

    You should be able to easily make a 3D Vision surround setup with a single TX and to T’s and since these should be based on the same LCD panel they should look perfectly matched.

    The BenQ XL2420TX should be usable with AMD cards for stereo 3D, but through the HDMI 1.4 interface only. Since the T model does not have a built-in IR emitter for 3D glasses you will probably not be able to use it at all…

  • 7 Noob // Feb 23, 2012 at 12:49

    thanks bro for the info!!! :-)

    So 3D eyefinity wont work with the DisplayPort 1.1 on these monitors ???

  • 8 specfreq // May 10, 2012 at 23:32

    I have one benq xl2420tx and two benq xl2420t’s

    I have a gtx590 with 301.24 beta. I can’t seems to get them into surround 3d.
    The built in emitter is detected and completes the 3d setup, but when i run the 3d test the glasses turn on but the screens are black and flash white every 10 seconds or so.

  • 9 Jan Bouvrie // May 29, 2012 at 17:56

    Thanks so much for mentioning that the XL2420T does NOT support 3D input from the PlayStation 3’s HDMI output. 3D input is ONLY supported through the DisplayPort and DVI ports.

    Would it be possible to convert the PS3’s 3D HDMI output to DisplayPort/DVI, to enable 3D playback from the PS3?

  • 10 costas // Jun 3, 2012 at 22:23

    I own a XL2420T and wanted to connect this monitor with my Alienware M14X which has a VGA, HDMI and Minidisplay port. Would I be able to achieve 120hz refresh rate at 1080p HD. Specifically, I would like to know which adaptor product to buy. So far I have tried a startech adaptor which is a DVI to Dual link, and with this product I only managed to get 120hz refresh rate at 720p. Thanks

  • 11 Bloody // Jun 3, 2012 at 22:42

    This one is advertised as being compatible with 3D Vision, though I haven’t personally tested it: http://3dvision-blog.com/6813-club-3d-displayport-to-active-dvi-dual-link-stereo-3d-adapter/

  • 12 jjboy91 // Aug 13, 2012 at 23:39


    When you say that “3D vision over displayport 1.1” is compatible with the Benq XL2420T.
    Does it mean that 3D Surround will be also available with a simple displayport cable ?

  • 13 Hugh // Nov 26, 2012 at 23:33

    So with the XL2420T, i can’t use a satelliteTV decoder with 3D channel (with “active” 3D) or Blu-ray 3D decoder who have not dvi port ??
    thanks a lot

  • 14 tasos7 // Dec 18, 2012 at 04:35

    hi there, i have an issue with the xl2420. When i turn OFF the 3D from nvidia control panel (uncheck ” stereoscopic 3D ” ) the monitor is still on 3D mode, the green LED on the corner is still lit and i cant use obviously the monitor’s settings,.The only solution i found is to turn off the monitor AND unplug the power cable, so it comes back to 2D mode (Green LED is finally off). PLEASE help !

  • 15 Bloody // Dec 18, 2012 at 13:09

    What option is choosen in the Stereoscopic 3D control panel for when the 3D mode to be active, it is on all the time, then try switching it to only when 3D programs run.

  • 16 tasos7 // Dec 18, 2012 at 21:58

    i have already tried this :(

  • 17 Gary // Jan 9, 2014 at 04:31

    I have a BenQ XL2420T . I want to watch commercial 3D BluRay disks. I have a BluRay optical drive and CyberLink PowerDVD 13 software. TWO QUESTIONS, what video interface should I use (HDMI, DL-DVI, DisplayPort) AND what 3D glasses? Please recommend a product for 3D glasses.

  • 18 Bloody // Jan 9, 2014 at 14:13

    What you would need is a compatible Nvidia-based video card, a full 3D Vision kin (glasses and IR emitter) and you need to use the DVI ot DP interface.

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