Just found by serendipity:
Since I installed my Blink, my garage door opener has not worked as well. I previously could open my garage door from about 75 feet away, but since the Blink install I had to be within about 15 feet of the garage door.
Since I enabled turning the screen off after 3 minutes, I can now open the garage door from 75 feet again.
My conclusion: The screen or it's lighting is noisy and interfering with the receiver in my garage door opener which is about 12 feet away.
I am thrilled to have a normal garage door opener again.