So this is my first project that isn't a tutorial and I may have gotten a bit ahead of myself. I've built an LED matrix ( 15 x 8 ) with the hopes of making a 3-letter display. I've connected all of the anodes into 8 rows and all the cathodes into 15 columns. What I have right now is very similar to the example in this video (though slightly different dimensions) https://www.youtube.com/watch?v=VG59l29Kksc
I'm looking for guidance as to how I should best control such a thing. At first I was thinking I'd just be multiplexing through the 8 rows and have a transistor for each column of cathodes, but now I'm realizing that the same voltage powering anywhere from 1 to 15 LEDs will result in either dimming the lights to nothingness or destroying them (I think).
So have I completely doomed myself? I see others that have made their own grids in similar ways but they all seem to use drivers to control them.
If I'm not doomed, what basic concepts do I need to understand or seek out to make this work?
Thank you for your time.