Always these weird lines
In: Technology
There are 2 things you might be referring to:
* The “miore,” effect. This happens when two grids overlap (you can see great examples by looking up images of “miore pattern.”) and produce a bunch of weird curved and criss-crossed lines. It can happen with chain-link fences, certain types of clothing, etc. For screens and digital cameras, it happens because the grid of pixels on the camera sensor are misaligned to the grid of pixels on the screen you’re recording, and so some double up, while some catch the small gap between pixels.
* The horizontal/vertical lines appear due to how the screen changes it’s brightness. A lot of screens use something called “PWM,” (Pulse Width Modulation) which is a fancy way of saying “flickers on and off really fast to trick your brain into thinking it’s dimmer.” Since cameras usually scan the sensor from top to bottom, it means that the camera is actually recording the screen at slightly different brightness levels in different parts of the image. It’s basically the same effect that causes [“rolling shutter effect,”](https://youtu.be/17PSgsRlO9Q?si=v_2SvieZLL-CNoQh) but with brightness levels instead of motion.
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