Hi, I am currently programing a 8x8 LED display. I am using a trackball to scroll left and right through the alphabet and then up and down for lower case letters, in the code I use a series of switch case functions, a problem has occurred where the display flickers between the current letter and the previous, Is there an issue with using the switch case function? I can post code if that helps!
Cheers 
Switch case works fine. There is a bug in your code or a flaw in your circuit. Post the full sketch (use code tags, the </> button in the upper left), and a schematic (not fritzing, we hate fritzing here).
Well that'd do it.
I find it very hard to get switch/case statements right.
Also, next time you have to post code here, use code tags as I said above - it makes it much easier for people to read your code and keeps the forum from mangling it.