Only started noticing this today. In every city I’ve ever lived in (east and west coast US), pedestrian walk signals have this triangular pattern grate over the actual lights that show the walk or wait imagery. Considering the panels use lights that are made to those actual shapes and not a pixelated display, what’s the purpose of the grate?
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I believe they’re there to stop animals from making their homes inside the lights, which would cause concerns for traffic safety.
It also makes the lights fairly directional, so people can’t see the lights they aren’t supposed to pay attention to, leading to less confusion.
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