The K map is of no use whatsoever to your design problem ! If you need to directly drive the pins of multiple 7 seg display, you can do that with a couple of sinking/sourcing drivers, for example the ULN2803 is a sinking driver. COnnect all your segments to the pins of one port (via the driver) connect all the common lines to the pins of another port(vai the other driver)

Create a lookup table that describes, for every number you wish to display, the port bits that should be on.

The rest requires some timer work.

Alternatively, the MAX7219/MAX7221 does all you need in one simple package. You need to drive the chip from a simple SPI bus. It displays up to 8 digits.

Steve