If you are near an urban area, you could also go to a local professional camera or movie supply and pick up a small sheet of Neutral Density filtration. This comes as a very thin sheet of plastic (gelatin) that is transparent but has a grey (neutral) coloration to it (you can also get various colors, but they likely will not change the color of a bright LED as you perceive it). It can be purchased in varying densities to cut the intensity of a light source by as much as three stops or more if you choose to stack it. One stop cuts the light in half, two-stops by 1/4, and three-stops by 1/8. You can cut it to shape with scissors or xacto and attach it with tape, or as you choose (fun-tak or butyl or tacky wax also might work), to the face of the display. If you need a large piece ask for Rosco gels or something like them. They are usually sold in sheets around 18X36 inches or so to filter a light source. If you just wanted to cover the small display itself you could just get small wratten filters used normally to filter at the lens which have less optical distortion and are a bit thicker (sizes are usually around 3" square or 5" square). The latter would likely be more expensive per square inch, but either would be an investment of under $15.
Marco
Marco
Marco
Marco
Marco
Marco