In the 1980s, it was widely used in household appliances such as volume indicators, switch directions, etc. In the 1990s, some new types of domestically produced car instruments also had LEDs, mainly used for charging indicators. Later, they displayed the engine speed situation. For example, a combination instrument produced in Xiangfan, Hubei Province had a vertical row of LEDs on the instrument side. When the driver stepped on the accelerator, the LED lights went from the first row of turn signals. When released, the LED lights went from top to bottom, and the results were quite eye-catching and beautiful. In the 1990s, China used LED high brake lights and installed them on cars. Due to the fast speed of LED lights, we can let the shadow driver behind the car know the driving condition in advance, reducing car rear end collisions.