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Where can I learn about display signals for color LCD screens such as these:?

I want to play with LCD screens on an Arduino, but I'm having trouble finding resources on generating display signals. I want to use color screens such as these:

http://preview.tinyurl.com/c5n6ew?
http://preview.tinyurl.com/d9d2vo?

Or even regular LCDs such as these:

http://preview.tinyurl.com/crm2wt
http://preview.tinyurl.com/2g5k24