Support for LED board screens and billboards

You can use a Yodeck Player for LED screens and LED billboards. We have users running large LED displays using Yodeck Players based on Raspberry Pi.

To properly use a LED display, you must perform some calculations and configurations.

Step 1: Setting the DVI resolution


First, you must identify what resolution your LED display (or LED board controller) requires as input. This is usually called the "DVI resolution".

To find out the resolutions supported, you have two options:
  • You can connect your display to a PC or laptop and see the resolutions it supports through the menus of your computer.
  • Check the manual or documentation of the LED display and find out supported DVI resolutions.
The Yodeck Player (Raspberry Pi) automatically detects the best possible resolution and uses that. If it cannot detect the preferred resolution, it will fallback to the safe VGA resolution of 640x480. If you need to force a specific resolution, see our article on "Changing the screen resolution" on Yodeck. Even if the resolution is detected properly, and you won't be changing the connected display, it is best to set it as forced, to make sure it does not change.

We will use two examples:
  • Case A: a LED display requiring a 1920x1080 DVI resolution input
  • Case B: a LED display requiring a 1440x900 DVI resolution input

Step 2: Identify the content area resolution


Large LED displays usually have a low resolution. Much lower than the DVI resolution expected as input. LED displays just use the top-left corner of the input for displaying content. For Yodeck to properly manage the LED display, we need to get the LED display resolution and use it to calculate configuration parameters.

For our two examples, let's say that the content in on the top-left corner, and the input is
  • Case A: the LED display is of 320x240 resolution (aspect ratio: 4:3)
  • Case B: the LED display is of 256x256 resolution (aspect ratio 1:1)

Step 3: Determining Show size


Based on the content are resolution, you have to use a specific aspect ratio for your Show in Yodeck. Yodeck supports a variety of aspect ratios, and you must find the aspect ratio that matches your content area.

If you can't find an exact match, then you must choose an aspect ratio that its grid can cover the whole of your content area. (Sound complicated? Contact our support team, they will help you out.)

So, for our two examples, let's say that the content in on the top-left corner, then the best aspect ratio for the Show would be
  • Case A: the Show aspect ratio should be select to be 4:3 (perfect match with aspect ratio of Case A LED display content area 320x240)
  • Case B: the Show aspect ratio should be select to be 3:2 (user should use the leftmost square region of the Show editor, covering two-thirds of the Show editor, thus the active area usable by the Show would be 384x256)

Step 4: Configuring the Player


First, you should calculate the dimensions of the DVI resolution that you must "disable", relative to the Show. Specifically:
  • Case A: you need to "disable" 1600 pixels (1920-320) from right, and 840 pixels (1080-240) from bottom
  • Case B: you need to "disable" 1056 pixels (1440-384) from right, and 644 pixels (900-256) from bottom
To properly configure the Monitor, follow these instructions: 
  1. Go to "Monitors" list and edit the monitor in question.
  2. Click on the "Advanced" tab.
  3. Make sure the "Allow Raspberry config.txt Override" toggle is set to "ON".
  4. In the "Raspberry config.txt Override Directives" textarea, you will have to add the some advanced parameters detailed after these steps.
  5. After you are finished, click the "Save" button.
  6. The Player will reboot. If you can't see anything for 5' (not even the Yodeck startup logo), then you can contact our Support Team asking for help. You can also set the "Allow Raspberry config.txt Override" toggle to "OFF" to disable all extra settings and boot normally.
  7. The parameters described below should be entered in one line each, followed by an "equals" sign, and then the desired value.
For Case A, you would use the following advanced parameters:
disable_overscan=0
overscan_right=1600
overscan_bottom=840
overscan_top=0
overscan_left=0
For Case B, you would use the following advanced parameters:
disable_overscan=0
overscan_right=1056
overscan_bottom=644
overscan_top=0
overscan_left=0

Step 5: Create and Use Show


Create the Show you want (using the aspect ratio from Step 3) and assign it to the Monitor. Click "Push to Players?" to push all changes, and you are all set!

If you have any difficulties setting this up, please contact our Support Team and we will help you out.

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