arduino - How to setup a 16x16 led ( 4x - 8x8 Leds) with 4 shift registers?

hey guys I'm confused on how to setup a 16x16 led ( 4x - 8x8 Leds) with 4 shift registers (hcf4094)?

because the one I learned is you use 2 shift registers in one 8x8 LED dot matrix. but how to do it with 4x - 8x8 Led matrix? 16x16 Basically.

Because when you setup 16x16 led matrix then you have to use 8 registers (2 shift Registers each), that's what ive understand.

But suddenly my professor said that you will only use 4 shift registers in the 16x16 led.

I am confused right now and searching on the net on how to setup but could find what I've need. Thank you!