Definition
A flat-panel electronic display that produces images by passing light through a layer of liquid crystals whose alignment is controlled by small electrical signals. In modern cockpits, LCD screens present flight, navigation, engine, and system information on glass-cockpit primary flight displays (PFDs) and multifunction displays (MFDs) in place of traditional mechanical instruments.
Plain English
A thin electronic screen that shows the pilot flight information, like the screens used in a laptop or modern television. In the cockpit, these screens replace the older round dial-type instruments.
Context Anchor
Seen in glass-panel cockpits, where flight instruments and navigation information are shown on electronic screens instead of only on round mechanical gauges.
Derivation
Liquid crystal refers to a substance that flows like a liquid but has molecules arranged in a regular pattern like a crystal. When a small voltage is applied, the molecules twist and either block or pass light, which is how the screen forms images.
Why Pilots Care
They give pilots clear, compact, and reliable information about attitude, navigation, and systems without the bulk or failure modes of analog gauges.
Intuition Check
Do not picture a screen full of loose liquid or hard crystals. In this term, liquid crystal means a special material inside the screen that changes how light passes through it when electricity is applied.
Example Sentence 1
The aircraft's panel had been upgraded from analog gauges to two large LCD screens showing flight and engine data.
Example Sentence 2
After engine start, the LCD screens illuminated and showed all engine parameters in real time.