LED Controller + LED Panel with common cathode
You'll need to connect a MOSFET in this way for every output in your driver. This means that a lot of transistors are needed!:



I could recommend you to buy the correct driver for the LED panel, because for you to implement this circuit, a MOSFET with high current capacity is needed. A TO-220 package (not so expensive) won't stand more than 2W in most cases, and because in a MOSFET, RDS(on) has a positive temperature coefficient, so the warmer it gets, the higher the resistance and gets even hotter, and if you add them a dissipator, the price for this gets even higher.