Without knowing the model number of your Whirlpool double oven I will not be able to provide any model specific information. If your oven is all electric I recommend locating the two (2) circuit breakers dedicated for the oven inside your house circuit breaker box and reset both breakers by flipping them both OFF and back ON 2-3 times and then recheck the display for any display. If there is no display after resetting both circuit breakers, the failure could be the power supply, thermal fuse, burnt wire or a failed electronic oven control board. The first step needed to begin diagnosing the failure is to check and verify the voltage supply to your double oven where the power supply is connected.
NOTE: I do not recommend checking and verifying the voltage supply unless you have experience and feel safe and confident in doing so, otherwise I recommend calling a service technician to diagnose and repair your double oven.
I recommend calling a service technician to diagnose and repair your oven or resubmit your question with the complete model number for troubleshooting assistance.