Electronic paper watch is a watch equipped with electronic paper display screen inside, which can display time, week and date. The main ways to realize electronic paper technology include cholesterol liquid crystal display technology, electrophoresis display technology (EPD) and electrowetting display technology. The electronic watch paper used in electronic paper watches mainly uses electrophoresis display technology. The display brightness and contrast of the electronic paper watch are high, and it is completely unnecessary to use backlight to improve readability. The electronic paper display used by the electronic paper watch has a simple hardware structure and a thickness of about 1mm. It is the new force in the watch army.

Timing instruments of mechanical vibration system, such as pendulum clock, pendulum clock, etc. Its working principle is to use a vibration system with constant period and continuous vibration. Multiply the vibration period during vibration by the number of vibration times, which is equal to the elapsed time. Time=the vibration period of the watch × Number of vibrations. It is generally composed of energy, gear train, escapement mechanism, vibration system, pointer mechanism and additional mechanism.