I am going to matrix then and use 9 595 shift registers to control them. I'm played around with 2 595s and understand how they work. I have a power question.
I assume that the vcc pin on the 595 is the power is sends to the output pins. Now, how does the power/resistor combo work if I want to light them all at once and then turn them all off but 1.
If I use a resistor at the end of each row and rate it for 1 led being on, won't they all be dim when I turn them all on? And if I rate it for all of them at once, won't 1 led blow up when I only turn 1 on?