I think you are referring to 'elastomeric' connectors (zebra stripes) used on LCD screens here.
They just act as a high density ribbon cable between the conductive pads on the LCD panel and the conductive pads on the PCB containing the display drive electronics.
dougw used an elastomeric connector in one of his micro:bit projects for PCB to PCB (rather than PCB to LCD) which may be of interest:
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