iPhone 6 - Log on screen opened up zoomed in - so large I can't get to the numbers to log on.

iPhone 6. Was working find. Had incoming text - log on screen was zoomed in so large that I couldn't enter passcode (one number filled almost the entire screen). Tried a hard reboot (held home key and start key until turned off). Of course when starting up again, requires the passcode (can't use Home Button fingerprint ID after a restart). I'm at a loss. Any suggestions?

Thanks, Jim