LED, light emitting diode (short for light emitting diode). It is a diode made of a compound of gallium (Ga) and arsenic (As), phosphorus (P), nitrogen (N), indium (In) by controlling the display mode of a semiconductor light-emitting diode, when electrons and holes When combined, it can radiate visible light and thus can be used to make light-emitting diodes. Used as an indicator light in circuits and instruments, or as a text or digital display. The gallium arsenide diode emits red light, the gallium phosphide diode emits green light, the silicon carbide diode emits yellow light, and the indium gallium nitride diode emits blue light. LED display screens are generally used to display various information such as text, images, video, and video signals.
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