https://blog.wongcw.com/2022/05/10/tcl%e8%8f%af%e6%98%9f%e5%85%a8%e6%96%b0lcd-vr%e9%9d%a2%e6%9d%bf%e5%8d%b3%e5%b0%87%e9%87%8f%e7%94%a2%ef%bc%9a1512-ppi%e5%85%a8%e7%90%83%e6%9c%80%e9%ab%98/