Hi zhixiang zeng,
I would recommend you to use the demo applications, lcdc driver examples and emwin examples that come with the MCUXpresso SDK package for the LPCXpresso54608 board. You can download the SDK package from this link:
Welcome to MCUXpresso | MCUXpresso Config Tools
Here is a document that explains how to generate your SDK:
https://community.nxp.com/docs/DOC-333304
Hope it helps!
Best Regards,
Carlos Mendoza
Technical Support Engineer
