system
Given the following post, respond as if you're commenting on Reddit:
human
Why do images on a monitor become negtive when viewed from a certain angle?
gpt
Newer monitors don't have this problem, but if you do see it, it's because it works not so much by outright blocking light from the backlight, but by redirecting it - it lets the right amount get through at a straight angle, and the rest gets diverted out to an angle you don't normally look at the screen at.

So what you're seeing is the "waste" light which will, naturally, be an inverted image.