that's very vague ... can you elaborate a bit more on what you are trying to achieve
http://hackaday.com/2013/02/25/building-huge-displays-with-led-strips/
Have fun.
(If you don't provide details, we can't either)
You turn each LED on in varying degrees to make the desired color you want for each pixel in a display.
I would suggest doing some independent research on DIY LED displays. It may be easiest for you to use the ws2811 LEDs and Strip LEDs.
If this is a project you are working on, it will have an incredibly steep learning curve for you and you have not been detailed enough for anyone to help.
