Sommario
Quick Takeaway
For different led display controllers it has a default showing canvas, ( canvas is the area where the computer can locate). For example
When using HDMI1.2, normally the canvas is 1920*1200.
When using HDMI 1.3, the default canvas is 3840*1080
When using HDMI2.0, the default canvas is 3840*2160.
Long-led display means the horizontal resolution or the vertical resolution has exceed default canvas’s horizontal resolution or vertical resolution. This means that the computer can not control a certain area of the led display. Which would need to do some setting to be able to control the led display.
| Input port | Default Canvas | Canvas Max limitation |
| HDMI1.3， DVI | 1920*1200 | Max Width 3840*600 Max Height 548*3840 |
| HDMI1.4 | 3840*1080 | Max Width 4092*1136 Max Height 1060*3981 |
| HDMI2.0，DVI1.3 | 4096*2160 | Max Width 7680*1080 Max Height 1080*7680 |
The main reason is that, The screen’s physical resolution is different from controller’s resolution (of which the computer detects, Just like a LCD screen, when you plug in the computer would detect a resolution of this LCD). For example if the controller’s resolution is 1920*1080,and the screen A’s physical resolution is 2560×288, then only the pixel’s coordinate within 1920×1080 can be controlled by this controller which means that only the pixels with the coordinate of (0,0)-(1920,288) in Screen A can be controlled (lighted up), the pixels with coordinate of (1921,0)-(2560,288) would not be controlled( which would be light off)
The default resolution of the controller is normally determined by the input port, For example, HDMI1.3 normally is 1920×1080@60Hz, HDMI2.0 can be 4K. (Mctrl300’s default resolution is 1920×1080@60hz, it can also customized other resolutions, but it has a limitation of the MAX width 3840×600@60Hz and MAX height 600×3840@60Hz.
Hence The screen setup can be divided into 3 different conditions. (if screen’s physical resolution has exceed controller’s carry ability, you would need to change a controller)
How to setup ultra long led display
Ultra long led display is very normal in foot ball led display, ribbon-like led display or creative led display.
We have already know that for the ultra long led screen. For example
If the screen’s physical resolution is 4800×200, While from the video controller (also be called sending box, sending card)’s part, it has a limit of the MAX width or height it can carry. Hence we need to make the physical screen resolution to map to what the video controller can control.( different types of video controller has different carry ability which means it can control how many pixels), Take Novastar mctrl300 for example, it can carry 1.3million pixels, while its max width carry ability is 3840.
And 4800 has exceed the Max width it can carry, but it did not exceed its full pixel pitch carry ability 4800*200=960,000<1.3million.
Hence we need to make some setting to make the computer reach that area.
Hence we config the led screen to have a resolution of 1200*800, though the screen’s physical resolution is 4800*200, but from the computer’s view, it’s resolution is 1200*800. as from the computer’s view, the resolution does not matter, as long as you can control the right pixel.(make the pixel to display the right color).
But now it raise another problem, as in the original image, the pixel at position of (1201,1), now is in (1,201), This means that we need to customize the display content.
How to set displaying content
1: In Synchronizing system
It has two conditions, and one problems
1.1: The video source is coming from your computer using the Viplex led screen display software.The customized displaying content can the same as your physical resolution 4800*200 ( which means that you can customize this resolution’s displaying content), and you can also customize resolution 1200×800 for your display content. To play text, it need to use cut-to-display-window. (this means you need to pre customized the materials, of course, you can stop the play, and change another display materials)
1.2: The video source is coming from a digital box, DVD, generated from a graphic card, or live stream and directly connected to the video controller, Then the video source has to be resolution of 1200×800. (this means the materials can changing all the time without stop)
The difference of those two conditions, is because, when you use Viplex (colorlight also have such software), and you use 4800*200resolution videos source, actually viplex has done the conversion.
1.3: Problems
When using Synchronizing system, we need to be careful with the controller you are using, as HDMI1.4 can only support MAX 3840*1080 resolution input. HDMI2.0 and DP1.2 can support 4K resolution input. Hence when you video source has big resolution, you need to check the input source’s port.
