Resolved! The way of specify an EDID data to display dual screen ...
Hello everyone ~Below link is my last question about display quality of dual screen. Fortunately I solved it but I faced other problem. https://community.st.com/s/question/0D53W00001mHWaWSAW/stm32mp1-can-i-duplicate-ltdcrgb-signal-for-dual-displayAs ...