Setting up Premium with an LED panel / module, there are are some things that need to be considered. 

LED displays typically have individually low resolution, but in total can have a higher resolution than Full HD.

The graphic card output is typically sent via an LED processor / sending card that accepts VGA/DVI/HDMI input. Input to the processor is usually a standard format, like 1024x768 or 1280x1024.

Settings

To enable LED Mode you should add the following custom settings:

• LedMode (Bool) = 1.
  Run in Windowed mode, always on top.
• ScreenWidth (Int)
  Window width in pixels.
• ScreenHeight (Int)
  Window height in pixels.
• ScreenX (Int)
  X position of window
• ScreenY (Int)
  Y position of window
• ScreenAdapter (Int)
  Index of screen adapter - 0 is the first screen.
  Note that if you specify the second screen, you may have to set ScreenX to <width of first screen>

Example

Let’s assume that the LED panel is 3450x96. To get away from the width limit, the LEDs are configured to divide this up into several "rows" stacked on top of each other, which gives three areas each in 1280x96 resolution.

Content is created in in Composer to fit. The areas are positioned using a screen definition to have pixel-perfect control of where the areas end up. 

Please check this rather shaky video of such a system in action, including an Crestron control panel:

https://www.youtube.com/watch?v=noQv3UsIojY

Please contact support if you want to know more about LED with DISE.