Definition
Flat-panel electronic screens that produce images by passing light through a layer of liquid crystal material whose alignment is controlled by small electrical currents. In modern cockpits, liquid crystal displays are used to present flight, engine, and navigation information in place of traditional mechanical instruments.
Plain English
Thin, flat screens — like the screen on a laptop or modern TV — that show flight information instead of using mechanical dials with needles.
Context Anchor
Seen on modern aircraft instrument panels, especially where flight instruments or engine information are shown on screens instead of separate round gauges.
Derivation
The name comes from the screen's working material — a substance that flows like a liquid but has an ordered internal structure like a crystal. Tiny electrical signals twist these crystals to let light through or block it, forming the image you see.
Why Pilots Care
Liquid crystal displays have replaced most analog instruments in modern aircraft. Pilots need to recognize that the information shown is generated electronically, which means it depends on electrical power and computer inputs — and can fail differently than a mechanical gauge.
Intuition Check
Do not picture a screen full of loose liquid. The liquid crystal material is held in a thin layer inside the screen and changes how light passes through it.
Example Sentence 1
The Cessna's glass cockpit uses two large liquid crystal displays to show flight and engine information.
Example Sentence 2
Maintenance checked the liquid crystal displays for any dead pixels before the next flight.