This is called the vertical blanking interval.

 the relief you need  obey your thirst  okay i get it  

      .                                                       
       .           .-.                                      / 
        .         /   \       .-.     .-       .-.         /  
         .       /     \     .   \   .  \     .   \       /   
          .     /       \   .     \ ,    \   .     \     /    
           .   /         \ ,              \ ,       \   /     
            `-'                                      `-'
w h a t ?