This physical phenomenon is known as "piezoelectric effect." In the event the quartz plate connected to the AC field polar. If the external alternating voltage frequency equal to the natural frequency of quartz, it's going to have resonance. This phenomenon is termed "piezoelectric resonance." By using stable oscillation, people developed a quite high precision electronic cheap LED watch [1] and quartz clocks. Electronic silicone LED watch is Fifty years with the Twentieth century began to can be purchased in the newest timer. The earliest a spreadsheet called "balance spring electronic watch", that was born in 1955. The odm watch balance wheel rather then electromagnetic winding drive to balance spring as the oscillator, micro batteries for energy, driven by electronic circuits work balance.