Car sun visors are useful for avoiding glare while driving. But they require constant adjustment on winding roads, and they don’t work at all if the sun is too low in the sky (e.g. sunrise, sunset conditions).
Instead of having a sun visor, what if the sun was blocked by an “eclipse disc,” a small opaque disc that could slide around in front of the windshield (or perhaps inside a double-paned windshield).
Using a small camera in the dashboard and an eye-detection algorithm, the car can figure out: 1) the position of your eyes, 2) the position of the sun, and 3) the location where a small object (the “eclipse disc”) could block the sun that falls on your eyes.
Then, the car can automatically move the eclipse disc around to block the direct light from the sun (Figure 2).
Adding a second disc for the front seat passenger (and perhaps another disc for the driver’s side window) would allow this system to totally replace the obsolete hundred-year-old sun visor. Embrace the future of automotive innovation!
PROS: Prevents accidents due to glare-induced impaired visibility.
CONS: May lead to a moment of horror when you think the sun has been replaced by a black hole, until you realize that it’s just the “eclipse disc” sliding around on your windshield.