The traditional light source is believed to be familiar to everyone, incandescent lamps, fluorescent lamps, and various lamps. However, the power consumption of these light sources can be quite large, and the new LED light source can solve this problem very well, its power consumption is quite small, and the brightness is not weak. Then let’s take a look at the led backlight LED.
What is led
It is a type of semiconductor diode that converts electrical energy into light energy. Like ordinary diodes, LEDs consist of a PN junction and also have unidirectional conductivity. When a forward voltage is applied to the light-emitting diode, holes injected from the P region into the N region and electrons injected into the P region from the N region are separated from the electrons of the N region and the P region by a few micrometers in the vicinity of the PN junction. The hole complexes to produce fluorescence of spontaneous radiation. The energy states of electrons and holes in different semiconductor materials are different. When the energy released by the recombination of electrons and holes is different, the more energy is released, the shorter the wavelength of the emitted light. Commonly used are diodes that emit red, green or yellow light. The reverse breakdown voltage of the LED is greater than 5 volts. Its forward volt-ampere characteristic curve is very steep, and a current limiting resistor must be connected in series to control the current through the diode.
The difference between led backlight and led light-emitting diode
The backlight is mainly composed of a light source, a light guide plate, an optical diaphragm, a plastic frame, and the like. The backlight has the characteristics of high brightness, long life and uniform illumination. At present, there are mainly three backlight types of EL, CCFL and LED, which are divided into side light type and direct type according to different light source distribution positions. As LCD modules continue to move toward brighter, lighter, and thinner, edge-lit CCFL backlights have become the mainstream of current backlight development. The development of backlights can be traced back to World War II. At that time, ultra-small tungsten lamps were used as backlights for aircraft instruments. This is the initial stage of backlight development. After half a century of development, the backlight has become an independent electronic discipline, and gradually formed a research and development hotspot.
Light-emitting diodes are simply referred to as LEDs. It is made of a compound containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), or the like. When electrons and holes recombine, they 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 gallium nitride diode emits blue light. Organic light-emitting diodes OLED and inorganic light-emitting diode LEDs are further classified by chemical properties.
Compared to various conventional light sources, LED light-emitting diodes have many advantages. The most prominent of course is that the power consumption is small, and the structure is relatively simple. The principle is not complicated, I believe many people have a certain understanding of him. It is also true that led LEDs are used in a variety of places, including new LED backlights.
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