LCD is a module. It has liquid crystal screen and two or more microcontrollers inside it. It does somany things on the simple liquid crystal screen just to display something. And we can control them using a few pins and set of commands which the built in microcontroller can understand.
If you are provide with a bare liquid crystal screen and two similar mcu’s can you make the display up??
Just learn the commands, it is far far more easier than the above task!