system
Given the following post, respond as if you're commenting on Reddit:
human
why when i tilt my laptop screen up do the colours go negative?
gpt
Each pixel in an LCD screen consists of several layers - a white layer, a colour filter layer, and a twisted liquid crystal layer.

The liquid crystals are connected to small electrodes and seen through Polaroid filters. When a current is on the crystals line up, causing light to go in the filter one way and get stuck at the second filter. When the electrode is off, the crystal naturally forms a 'twisted nematic' phase. This is an almost magical phase analogous to one part of a spiral staircase - it is 'almost magical' in the sense that it can twist the plane of polarized light. Thus light can go in one polaroid filter; get twisted by the crystal and exit the second filter.  Gradiations of current produce gradations of light.

The screen is designed to be viewed head on. When you see it at an extreme angle the various layers don't line up properly. Given that every pixel has the same three colour filters (red green blue) in the same order, you get the same discrepancy on all pixels. What should be a red part of a pixel may become blue, and so on.