What should be applied across Liquid Crystal Display material to alter its alignment and light polarizing properties?

The correct answer is voltage because applying a voltage across the Liquid Crystal Display (LCD) material alters the orientation of the liquid crystal molecules. This change in alignment directly affects how light passes through the display, thereby altering its light polarizing properties.

LCDs utilize liquid crystals that respond to electric fields, and the application of voltage enables control over the crystal alignment. By changing the orientation of the molecules in the liquid crystal layer, the device can modulate light effectively, allowing for the creation of images on the screen. The manipulation of voltage permits precise control over the brightness and color of the display.

In contrast, while current might also flow as a byproduct when voltage is applied, it is the voltage itself that is critical for modifying the liquid crystal alignment. Resistance relates to how components oppose electrical flow but does not play a direct role in altering the properties of the LCD material. Inductance involves magnetic fields and alternating current, which are not relevant to how LCD technology operates.