That is why a typical single color 8×8 dot matrix unit has 16 pins, ... Connecting the MAX7219 single module is a little bit difficult because you need to connect the dout pin of a module to the Din ...

The TiM is an 8 x 16 matrix of the ubiquitous WS2811/Smart Pixel/NeoPixel RGB LEDs with built-in controller. We’re seeing more and more of these serial LEDs as they drop in price.