Nios II evaluation KIt, how to write to the LCD

It can be very complex, but if you start small like you said you will eventually get the whole picture.

If you want to know how to send pixel by pixel I would start by reading the video_sync_generator.v file located in ip\sopc_builder_ip\altera_avalon_video_sync_generator in your install directory.

It is very well commented and even if you're not a Verilog expert I think you will be able to have a basic understanding of how it works. That and the manufacturer's datasheet for the LCD will give you a good head start.

Good Luck!