https://blog.wongcw.com/2019/05/27/%e8%8f%af%e7%a2%a9%e5%ae%a3%e5%b8%83%e6%8e%a8%e5%87%ba240hz%e4%be%bf%e6%94%9c%e5%bc%8f%e9%81%8a%e6%88%b2%e9%a1%af%e7%a4%ba%e5%99%a8/