Plain English Meaning
It's the type of screen used in glass cockpits and many cockpit instruments. A thin layer of special liquid behind the glass changes how it lets light through, which is what creates the picture you see.
Full Definition
A flat-panel display technology used in modern cockpit instruments and flight displays, in which a layer of liquid crystal material is sandwiched between two polarized glass panels. When voltage is applied to specific areas of the crystal layer, the crystals align to either block or allow light from a backlight to pass through, forming the images, numbers, and symbols seen on the screen.
Context Anchor
Seen in discussions of electronic flight instrument systems, glass cockpit displays, and modern panels.