参考文献:
1. https://reversepcb.com/redistribution-layer/
2.https://anysilicon.com/understanding-wafer-level-packaging/
3.https://blog.csdn.net/ffdia/article/details/116222777
4.https://blog.csdn.net/flomingo1/article/details/139355326
5.https://www.farcien.cn/show-6-32-1.html