Segment display

A segment display forms characters or symbols by selectively illuminating a fixed set of discrete elements. Common designs use light-emitting diodes or liquid crystals.

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Seven-segment display: A display that uses seven independently controlled bars to form decimal digits and some letters. Its familiar bar pattern is the standard example of a segment display.
Light-emitting diode: A semiconductor device that emits light when current flows through it in the forward direction. LED segments produce light directly and switch rapidly.
Digital clock: A timekeeping device that presents the time in numerical form. Seven-segment digits became a standard way to show time at a glance.
Dot-matrix display: A display that forms characters and images from a two-dimensional grid of individually controlled dots. A dot grid offers more flexible shapes than a fixed segment arrangement.
Fourteen-segment display: A display with fourteen independently controlled segments, allowing a wider range of letters than seven-segment designs. Its added diagonal and central segments expand the character set.
Liquid-crystal display: A display that controls light transmission using electrically responsive liquid crystals. Many segment displays use shaped liquid-crystal regions instead of self-luminous elements.
Calculator: An electronic device that performs arithmetic and displays numerical results. Compact segment displays suit calculators' emphasis on numerals and symbols.
Alphanumeric display: An electronic display designed to show letters and numbers, often using a character grid or segmented elements. This broader display class includes segment-based and matrix-based implementations.
Sixteen-segment display: A display with sixteen independently controlled segments, commonly used to show alphanumeric characters. Its finer segmentation makes more letters legible than simpler layouts.
Electroluminescence: The emission of light from a material in response to an electric field or current. It is the physical basis of some non-LED segment display technologies.