LCD_CtrlWrite and LCD_DatalWrite just assert the RS singnal,
for LCD module, he can know if you are writing the register address or register data right now. That's it.
LCD module and LCD is totally different, you 'd better know how the TFT or CSTN LCD interface is working.
There should be a firmware or ASIC and display buffer inside the LCD module to handle the command and
data from the host MCU and refresh the LCD panel.