Digital clocks usually use the AC power oscillating or 32,768 Hzhz crystal oscillator in the AC power supply. Most digital clocks display the hour in the day in 24 hours; in the United States and other countries, the commonly used hour order options are 12 hours format (with some AM or PM instructions). Some watches, such as many digital watches, can be switched between 12 hours and 24 hours. Face simulation of people with analog style usually uses the LCD screen, and these are sometimes described as numbers.

In order to represent the time, most digital clocks use seven -segment LED, VFD or LCD to represent each digit in the four digits. They usually include other elements to indicate whether the time is in the morning or afternoon, whether a alarm clock is set up. The older numeric clock uses the numbers painted on the wheel, or the petals are displayed. The high -end digital clock uses the dot matrix to display and uses animation to make digital changes.

set up

If people find that it is difficult to set the time in some digital clock design in the clock is not a key function, it may not be set at all, and the default is displayed after booting, 00:00 or 12:00

Because they are running by electricity, the digital clock usually needs to be reset during power off, even in a very short period of time