Datalogic JOYA X1 R2U User Manual page 96

Liquid Crystal Display (LCD)
A display that uses liquid crystal sealed between two glass plates. The crystals
are excited by precise electrical charges, causing them to reflect light outside
according to their bias. They use little electricity and react relatively quickly.
They require external light to reflect their information to the user.
Light Emitting Diode (LED)
A low power electronic light source commonly used as an indicator light. It uses
less power than an incandescent light bulb but more than a Liquid Crystal
Display (LCD).
RAM
Random Access Memory. Data in RAM can be accessed in random order, and
quickly written and read.
RF
Radio Frequency.
RTC
Real Time Clock.
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