why do some electronic screens look wavy when they’re being taken on a phone/digital camera?

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Also when I turned the picture sideways, the waves looked different. Why?

In: Technology

because most electronic screens have a refresh rate. the led’s or lcd’s or whatever are not continuously outputting the image. they are being refreshed 60 times a second in most cases. and your camera can pick up on that. if you change the shutter speed on your camera, you can make the effect more pronounced or make it go away. but most cheap/cell phone cameras shoot at a slower shutter speed where the effects are more apparent.