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Why does this kind of screen chenge color at different angles? (lemmy.zip)

submitted 10 months ago by [email protected] to c/[email protected]

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[–] [email protected] 42 points 10 months ago (2 children)

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.

[–] [email protected] 3 points 10 months ago

like you’d see on an oil slick or a soap bubble.

Or roast beef!

[–] [email protected] 3 points 10 months ago

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.