在过去的几十年中，我们已经非常熟悉发光二极管的广泛应用，从微波炉的数码显示到计算机的电源开启显示，处处可见到这种耗能少、费用低、寿命长的电子产品的应用。由于发光二级管具有这些优点，人们开始用它开发一种新产品，用以替代交通信号灯。制造商将红、绿、黄发光二极 In the past few decades, we have become very familiar with the wide range of applications of light-emitting diodes. From the digital display of microwave ovens to the power on display of computers, we can see the application of such electronic products with low energy consumption, low cost and long service life everywhere. Due to these advantages of light-emitting diodes, people began to use it to develop a new product to replace traffic lights. Manufacturers will be red, green, yellow LED