Did I Break My Kenmore LCD Adjustment Knob?

I turned the adjustment knob on my kenmore 19001 and I must have broke it. The screen was fine before I decided to turn the knob for some supid reason. I tried to get the screen to display properly (like it was before I turned it) but the more I turned the worse it go. The button will keep turning in either direction -- does not reach the point where you would turn it the other way. Now the screen is blank with light or dark backdrop; with no display of buttons. I can touch the screen and hear the beeps, just can not see what/where what selections are being made.

What did I mess up and how can I fix this? I lost my job and was trying to do some sewing to make some money. HELP!