I used P channel mosfet transistors in a super sot-3 package (same as sot-23). You could also use standard pnp bipolar transistors, remember to include a base resistor. The exact transistor is not important, the only thing to watch for is that it can handle an entire column of current, for example 7 * 25ma.

The circuit for the scrolling sign is the same as seen here - it’s just better software in the mcu which does the scrolling. the materials are simple, a mcu, an led matrix and some transistors.