I am thinking about buying an arduino, but before I buy anything i would just like to know whether this LED array I designed would be any good.
The 4022 is a counter that outputs 5v at 8 pins, one at a time, changing the outputed pin every clock signal. This means the arduino can update the array one line at a time, taking advantage of persistence of vision to display an image. While i know the result is almost identical to using a MAX7219, the advantage is that by adding a larger counter, or an array of counters the matrix could easily be expanded.
What I would like to know is whether or not this display would be able to update fast enough for it to not look flickery. How many modules of 8x8 could i have controlled by the same system before it would begin to look flickery? I am not 100% sure but i think at least 20hz refresh rates are required for decent persistence of vision.