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The principle of LED is composed of semiconductors with positive and negative charges. When powered on, the two semiconductors combine, and the energy generated from them is released as light energy. And what we usually refer to as an LED screen actually refers to an LCD display screen that uses LED as the background light source. Previously used CCFL (Cold Cathode Fluorescent Tube) had higher volume, heat generation, and brightness than LED, so new LCD displays began to switch to LED backlighting.

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