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That looks like a type of Thin film interference, like you’d see on an oil slick or a soap bubble. Wikipedia says:
Thin-film interference is a natural phenomenon in which light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
I’d guess the display uses a thin film on one of its layers causing this rainbow interference pattern that shifts depending on viewing angle.
like you’d see on an oil slick or a soap bubble.
Or roast beef!
So if that’s actually just a guess, I’m impressed, and you must have some experience in thin-film lol.
LCD panels actually use a thin film of silicon (I think it’s silicon) over each pixel. And cheap panels using TN technology often have this issue and very poor viewing angles.