The panel is illuminated by a backlight visible through the yellow plastic or other translucent, yellow material.
The problem is that the light is too bright for your exposure setting and all R / G / B channels have been cut off. When all the channels are close to the maximum value, the result is white, as you can see in the picture example, if you look closely. This is what causes the unsaturated look. Human eyes have a wider dynamic range than camera sensors, so this seems normal to us.
You can reduce your exposure by lowering the ISO sensitivity or choosing a smaller aperture or a shorter shutter speed. Unfortunately, the rest of the scene will probably be underexposed. You can also take two pictures and merge their shows (or use an HDR mode if your camera supports them directly).
If you are taking raw images, check if all values are also cut off in the raw sensor data. If not, you may be able to improve the appearance by changing the exposure settings during post-processing.
In my opinion though, that sounds good to me and I would probably leave it that way.
Related link if you want to know more about dynamic range: