rearview display mirrow

My side and rear view mirrors get very dark at night, and it makes it especially hard to use at dusk. I know they have auto dimming, but I don't know how to control it. They work great in the daylight, but as soon as the sun goes down they turn dark gray. Cars without headlights on don't show...

NYTimes article today mentions that the Chevy Bolt will be getting a mirror that can be switched to a display for a rear-top mounted videocam. Looks to me that, instead of a fisheye lens, it uses a wide sensor or pieces together three square views, so it gets passing lanes. http://nyti.ms/253PFDQ