system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do monitors use red green and blue pixels, rather than red green and violet?

It seems to me you could produce a wider gamut of colors if you used a violet subpixel rather than blue. Since our eyes can see at wavelengths below blue, by using a blue subpixel there exist colors of shorter wavelenths that simply can't be reproduced on a display.

Violet is a truly stunning color, and can't be displayed on a monitor. The closest approximation you can get is some hues of "purple" which really aren't anything close to true violet.
gpt
When they originally started developing color monitors and TV's, there did not exist a mass produceable phosphor that produced a violet color.  So color TVs used blue.  Broadcasts used data streams for red green and blue colors and so storage media (like VCR tapes) also stored RGB data.  If we were to introduce a violet pixel now instead of blue , you could color convert the r-b data into r-v data, but you would still be missing the deep violets that you want since that color wasn't stored in the original media.  If you wanted to develop this you would need to develop monitors that had a violet pixel instead of blue, cameras that recorded the violet color and storage media that could store it (although todays hard drives are pretty agnostic as far as that goes, so thats a minor issue).  So yes, you could do it but you would need to replace all of the infrastructure that now exists, so it would probably remain a niche market like all the things for "audiophiles" but in this case would be for "videophiles"