Microstrip line configuration for phase-shift unit, antenna array, display panel and display device

A phase-shift unit, comprising:

• a first substrate and a second substrate assembled to each other;
• a liquid crystal layer provided between the first substrate and the second substrate;
• a microstrip line provided at a side of the second substrate facing towards the liquid crystal layer, and configured for receiving a voltage signal that controls deflection of liquid crystal molecules in the liquid crystal layer and for receiving or transmitting an electromagnetic wave signal;
• and
• a grounding layer provided on the first substrate and including a via hole corresponding to the microstrip line;
• wherein a first end of the microstrip line corresponds in position to the via hole, and a second end of the microstrip line is connected to a feeder interface configured for feeding an electromagnetic wave signal from an electrical cable into the microstrip line, or for feeding the electromagnetic wave signal from the microstrip line into the electrical cable;
• and
• wherein the grounding layer is provided at a side of the first substrate facing towards the liquid crystal layer.