LED,LCD,Seven segment display, basic, operation of various commonly, used types. please define to all..
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A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it.
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directly, instead using a backlight or reflector to produce images in color or monochrome
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