How to make the iPhone s screen always to stay ON?

I want to connect my iPhone to my car via the USB cable and to listen music in my car from the iPhone and everything is fine. But I want the screen to be always on the the song s album artwork to be on the display. This happens if the phone is locked when I press the button to unlock it, but after a few seconds usually as you know - the screens shuts down. I want to make it to stay forever and I will be very happy is there are ideas to make that possible to show the album artwork always on the iPhone s screen while playing songs.

Could only do that if the phone is unlocked. Once it is locked it is going to turn off the display after a short period of time.