system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some PC screens appear to inverse colors on the screen depending on the viewers angle?

For example, looking at a Lenovo Thinkpad from an angle about 45 degrees from parallel to the screen makes the image appear inverse without colors.
gpt
This is caused mostly by the TN LCD's, or Twisted Nematic. These LCD's are cheap and energy efficient, but suffer from poor viewing angles due to way that it bends light through different filters to achieve different colors, or to block light. When you view the display at different angles, you can see past these filters and see the different colors that are supposed to be hidden.

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IPS and VA LCD's do not have this issue, though they can suffer from slightly more dim images at sharp angles.