Video wall technologies

A video wall consists of multiple computer monitors, video projectors, or television sets tiled together contiguously or overlapped in order to form one large screen. Typical display technologies include LCD panels, LED arrays, DLP tiles, and rear projection screens.

Simple video walls can be driven from multi-monitor video cards, however more complex arrangements may require specialized video processors, specifically designed to manage and drive large video walls. On the front side you just see a big bright picture.

There were many LED video wall on display at AudioVisual 2013. I took a view what they look on the both sides. This one shows a quite typical arrangement used on LED video walls.

av13_td4

On the back side you can see how those things are built from square units that are connected to each other to form a display of needed size. In this specific display the parts on the vertical row were connected together with two wired between every display module. The bigger connector that looks like Speakon connector is actually a PowerCon connector that carries mains power. The power gets to the bottom module and gets though the module to the next above.

av13_td5

Next to the power connector there was another connector that looked outside like XLR connector, but was XLR shell with RJ-45 connector in it. I am not sure what signal format is carried there, but I think it could be Ethernet. The video/picture data seemed to be coming to the video wall with RJ-45 cable.

Video walls are expensive professional hardware, but there are also some cheaper DIY projects in Internet related to video walls. Here are some links to DIY video wall projects for those who want to try to build their own video wall system:

Hackaday.com video wall projects

Giant video walls powered by a Raspberry Pi

Multiple Raspberry Pi boards used to create video wall

DIY LED Video Wall

11 Comments

  1. youtube.com says:

    Genuinely when someone doesn’t know after that its up to other
    people that they will assist, so here it happens.

    Reply
  2. Tomi Engdahl says:

    Massive LED Display Makes Use of Reused Soda Bottles
    http://hackaday.com/2014/03/19/massive-led-display-makes-use-of-reused-soda-bottles/

    What better way to make a giant LED display than out of old empties and bottle crates? This is the Mate Light (pronounced Mah-Tay).

    Anyway, this impressive display makes use of 640 empties arranged in 4 rows of 8 crates for a decent 16 x 40 resolution.

    Reply
  3. Tomi Engdahl says:

    BARCO NX-4 GROUP REVERSING ADVENTURE
    This a project for a group of folks working to reverse engineer the Barco NX-4 LED panels.
    https://hackaday.io/project/27799-barco-nx-4-group-reversing-adventure

    Reply
  4. Tomi Engdahl says:

    MuxLab’s latest AV-over-IP fiber extender delivers uncompressed 4K/60 video globally
    http://www.cablinginstall.com/articles/2018/02/muxlab-avip-fiber.html?cmpid=enl_cim_cim_data_center_newsletter_2018-03-05&pwhid=6b9badc08db25d04d04ee00b499089ffc280910702f8ef99951bdbdad3175f54dcae8b7ad9fa2c1f5697ffa19d05535df56b8dc1e6f75b7b6f6f8c7461ce0b24&eid=289644432&bid=2022539

    MuxLab (Montreal, Quebec) says its AV over IP 4K/60 Uncompressed Extender, Fiber (model 500761) “offers a new twist to an existing favorite [product].” Like MuxLab’s other IP-based extenders, this device delivers 4K/60 video from one or many sources, among one or many displays.

    The unit connects sources to displays through a 10Gig Ethernet Switch, enabling an easy, scalable way to implement virtual matrix switch and splitter configurations. “Massive video walls can be created at nearly any user-defined scale, provided the network bandwidth is available,” according to a company press release.

    MuxLab’s AV over IP 4K/60 Uncompressed Extender, Fiber (model 500761) supports both HDMI and DisplayPort inputs for greater compatibility. The systems’ transmitters and receivers can connect to the Switch using OM4 multimode fiber cable, effectively transmitting up to 1300ft (400m) in distance so equipment can be stored far from the installation and accessed remotely.

    Resolutions up to 4K/60 are supported when using both HDMI and DisplayPort. When uncompressed, zero latency video is delivered at 4K/60 (4:2:0). With light compression and visually lossless latency (less than one frame), video is delivered at 4K/60 (4:4:4).

    The unit supports analog audio alternatives, with the ability to insert two-channel audio on the transmitting side and extract it at the receiver. Both transmitter and receiver come equipped with a 1G Ethernet Switch port to connect network devices. RS232 and IR provide remote control options.

    Reply
  5. Tomi Engdahl says:

    The Pixblasters Video LED Controller
    https://blog.hackster.io/the-pixblasters-video-led-controller-ec692f54535d

    The WS212B-based LED strips have become an almost ubiquitous solution when flashing coloured lights are needed. Despite this, it can be hard to connect large numbers of them together into a single display, which is where the Pixblasters MS1 video controller board might come in handy.

    https://www.crowdsupply.com/pixblasters/pixblasters-video-led-controller

    Reply
  6. Tomi Engdahl says:

    Driving video wall panels. (including free test software)
    https://www.youtube.com/watch?v=_dB1w99AwGE

    It turns out that the video wall panel used in the TV series Project MC2 merchandise is actually a standard 75hub LED video wall module.
    These modules are “dumb” in that they require a continuous stream of data being updated and scanned at high speed to create an image. This is quite an intense processor load, so these modules are usually used with dedicated drive cards that can receive image data and then output it at high speed to a grid of these panels.
    Having identified the chips on the back of the PCB and sussed out how they might be driving the LEDs I attached a PIC microcontroller and wrote some software to drive the panels.
    Initially I wrote a simple routine to display a single line of a single colour. The usual “Hello world” test to see if I had deduced the drive system correctly.
    I then wrote a bit of software that can test the panels completely using a single microcontroller (PIC16F627A) with no other additional components other than a standard 100nF decoupling capacitor across the power pins. The same 5V supply used to power the panel can be used to power the test circuitry.

    Reply
  7. Tomi Engdahl says:

    https://github.com/hzeller/rpi-matrix-pixelpusher

    Controlling RGB LED display on Raspberry Pi GPIO via PixelPusher protocol

    https://github.com/hzeller/rpi-rgb-led-matrix

    A library to control commonly available 64×64, 32×32 or 16×32 RGB LED panels with the Raspberry Pi. Can support PWM up to 11Bit per channel, providing true 24bpp color with CIE1931 profile.

    Supports 3 chains with many panels each. On a Raspberry Pi 2 or 3, you can easily chain 12 panels in that chain (so 36 panels total), but you can theoretically stretch that to up to 96-ish panels

    Reply
  8. Tomi Engdahl says:

    The biggest #videomapping in the world by MediaCraft presented on 40 #skyscrapers in #China on the 21 December 2019. This #immersive #projection features #motion #design and #epic #soundtrack synchronised to multiple #buildings creating the biggest #projection #mapping #environment in the #world. Premiere was held in #Shenzhen #Guangdong in December 2019. This is a #new #version of the #worldwide recognised #generative #art #lightshow.

    Created by MediaCraft Projection Mapping
    Music and video by: Makaruk
    Comissioned in 2019 by: UABB Bi-City Bienalle for Urbanism and Architecture

    #cyberpunk #city #lights #digital #era #future #urban #architecture #showcase #2020 #worldclass #audiovisual #multimedia #modern #art #shenzhen #china #event #sound #epic #narrative #spirit #hacker #makaruk #mediacraft #innovative #revolutionary #cuttingedge #visionary #intermedia #civic #downtown #metropolitan #display #parade #presentation #spectacle #shine #phenomenon #arts #culture

    https://m.facebook.com/story.php?story_fbid=3673266856047248&id=168741456499823

    Reply
  9. Tomi Engdahl says:

    Nokia Lumia Live and Deadmau5: Amazing live perfomance with 4D projection in London
    https://m.youtube.com/watch?v=k3RP9-oUibY

    Reply

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