This is a huge issue and there are many factors that play into how they look on camera. Without seeing an example of your issue, it is difficult to properly diagnose, but if you could share that in more details or a photo that would be helpful.
In many cases the LED panels themselves have differing levels of components and the turning of the panels makes a significant difference in how they display both to the human eyes and on camera.
In some cases changing the turning and also looking at your camera settings can greatly improve things, but in some cases the electronic design and quality of components used will make a LED panel simply perform poorly on camera.
If you would like to have a further discussion or help, please feel free to reach out to me on my email