technicalitch
The rainbows are technically called moire. Cameras have problems with moire on not just electronic screens but patterns on clothing, etc. See: https://photographylife.com/what-is-moire
See the strange rainbow pattern on the left side of the image, as well as the wavy pattern visible on the right side? That’s moiré for you, at its worst. Moiré is almost never seen in nature, but can be commonly found when photographing everyday objects – you might see it in all kinds of fabric (jackets, shirts, towels, and curtains), straight hair, architecture, etc. You might have even seen it on your television.
Do you get eyestrain by looking at moire producing shirt in real life? Do you have trouble with repeating patterns like stripes or window blinds?
After stumbling onto this site about a year ago, I learned and still learning how to measure various aspects of my screens like pwm flicker, temporal dithering and pixel flicker, color spectrum to try to find other potential contributors to problems. I'm still learning about screen "VCOM". See this discussion.
The pixel structure is important such as OLED versus LCD. However, I would try to investigate other aspects of your screen as well. Expect no simple quick solution and any so called "solution" probably needs to be personalized to your situation (including state of health, environmental lighting, and so many other things). At the same time, their seems to be general guidelines on what a better safer monitor and computer might be (list1 and 2, list3) with some current disagreements.
I personally prefer higher pixel density as dithering effects "may" be potentially reduced. I'm ok with 4k at 27 inch at 120hz refresh rate or above so 1440p is a bit too low resolution at that size of a display. Have you tried using a smaller screen with high pixel density (based on your experience with your phone)?
I've posted this link before:
https://forums.blurbusters.com/viewtopic.php?t=6799
The important job is to make sure FRC/temporal dithering is below the noise floor of human vision. Also at high resolution, FRC pixels are so fine that it's almost like invisible spatial dithering instead of temporal dithering. Also, FRC is dithering only between adjacent colors in the color gamut, not between widely-spaced colors (like some technologies such as DLP has to).