This category contains multiplexed LCDs without integrated display controller. To control such LCDs you need a microcontroller with integrated LCD controller, or you need to generate the required waveforms in software.
The number of backplanes of a multiplexed LCD determines the multiplex factor and how many LCD segments can be controlled via a single I/O line. For example a 4-way mux LCD has 4 backplanes and a single segment pin controls 4 segments of the LCD. To control n segments of a m-way multiplexed LCD, you will need n/m+m signal lines. For example to control a 40 segment 4-way multiplexed LCD, you need 40/4 + 4 = 14 I/O lines.