LCD needs backlight. Many people know that the mainstream backlight is LED, which replaces the past CCFL backlight. This is an inevitable trend, just like LCD instead of CRT, IC instead of vacuum tube electronic circuit, the era of solid devices Already, LED is undoubtedly a solid device. Its essence is semiconductor. The use of molecular excitation luminescence is a relatively advanced illumination method currently mastered by humans. 
When it comes to the mechanism of luminescence, in addition to molecular excitation luminescence, there are several types of heating luminescence, discharge luminescence, reaction luminescence and chemiluminescence. These illuminating modes are also common in daily life, such as candle burning is heating illuminating, lightning It belongs to discharge luminescence, explosives belong to reactive luminescence, LEDs (ie, light-emitting diodes), lasers, etc. all belong to molecular excitation luminescence.
Lightning is the representative of discharge luminescence
From the daily experience, we can know that in addition to the excitation light, several other illumination modes are difficult to maintain for a long time, because they are all in the process of illuminating, there is always a consumable, such as a filament or gas that discharges light. After a period of use, the filament will break, the gas may overflow, causing the light to be interrupted, but the LED does not have such a concern, its structure is simple, and the molecular excitation light is used, theoretically it has a luminescence lifetime of 50,000 hours. As long as the semiconductors that make up the LED are not damaged, they can work all the time.
LED backlight in LCD
Long life and durability are the advantages of LED backlight, which is one of the important reasons for its application in the backlight field of liquid crystal display. However, due to the special application and environment, the life of LED in backlight field is not as long as theoretical time. With a service life of 15,000 hours, even in this case, it still has an advantage in terms of time of use.
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