If I hold a hair up to my Dell XPS 13 IPS screen at varying angles, the following patterns result:
In this one, particularly, you can see the frequency of the pattern/colour oscillations changing with the angle, as the hair curls right at the end (I also just want an excuse to include this, because it looks awesome).
Things to note:
- The more diagonal, the greater the frequency of these colour oscillations
- The more vertical, the more colourful/vibrant the pattern
- The more horizontal, the more black/white/grayscale the pattern
- The variation in the frequency of the colour oscillation on a given strand is due to the curvature in the hair. If I hold it perfectly straight with a second hand, there is no oscillation at all, but a single, pure colour, the entire length.
- My screen is the matte, 1920 by 1080px, IPS screen of the Dell XPS 13. If I zoom in on it with a clip-on macro phone lens, this is what I see:
I have some ideas of how this could come about, but the exact physics, e.g. how the full visible spectrum is reproduced when the incident colours are (equal intensity) red, green and blue and a more quantitative explanation of the period of oscillations than my 'it depends on angle' is not apparent to me.
I'm very curious to hear any explanations of these phenomena!
(Sorry if the tags are inaccurate.)