LED light source is very widely used, not only in the lighting market, the development is very rapid, in the display area, is even the world of unified backlight, whether it is a TV or monitor, or mobile phones and tablet PCs, are the world of LED backlight, itself It can also be shown that outdoor LED color screen is the main application market for LED display. In addition, its simple text display capability is also very common. It can be said that LED is everywhere, it is a very practical and low-cost technology. Typical of new light sources. We also expect that this technology can continue to expand into new areas and exert its own unique power.
What is LED technology?
Nowadays, these three letters of LED often appear in people's lives. When you visit the TV market, the shopping guide will tell you that the TV you are focusing on is LED TV. When you are renovating, the construction staff will ask you if Willing to install LED light bulbs, when you are on the streets, watching a few hundred inches of big screen sighs when the display technology developed, in fact, this large screen is LED products, then what is the LED? Why does this technology appear in lighting, display, and backlighting?
LED is a light-emitting diode (English: Light-Emitting Diode, referred to as LED), which is a light-emitting device based on semiconductor technology, and the traditional light bulb using the filament light emitting principle is different, LED light-emitting diode is injected into the current directly into light The energy technology, when it is in the forward working state (ie, the forward voltage is applied at both ends), when the current flows from the LED anode to the cathode, the semiconductor crystal emits light of different colors from the ultraviolet to the infrared, and the intensity and current of the light. related.
LED light source structure
Therefore, LED is essentially a kind of lighting technology. The reason why it is used in the field of backlight and display is mainly because LED light sources can emit different colors of light, especially light of red, green and blue colors. Friends who are familiar with optical theory As we all know, these three colors are three primary colors. It can emit such light, which means that it can be used to display images. In theory, as long as the LED light emitting device is small enough,
The small size, which can emit different light is the two most obvious advantages of LED technology. In addition, LED has many advantages that can not be ignored, which accelerates the development of this technology. Next, we have a look at what advantages LED has.
What are the advantages of LED
Above we also talked about, LED technology does not have such a thing filament, although the semiconductor material itself is also a consumable, but its stability and durability are unmatched by the filament, the filament is very slender, not only difficult for a long time continuous Use, it can not withstand the unstable environment, and LED light source life is very long, generally can reach more than 20,000 hours, even in the wind and sun environment, but also longevity is not bad.
LED light source has many kinds of volume
Low operating voltage and small operating current are also major advantages of LED technology. Traditional light sources require large voltages and relatively large currents. This not only wastes more resources, but also limits the application of traditional light sources. In the equipment, the high voltage environment that the traditional light source can't be given, so LED occupies the portable light source market, it only needs tens of volts of voltage, the electric current pass rate is naturally lower, so not only very environmental protection, but also let portable light source market, With the new solution, this is why mobile phone backlighting is the root cause of LED.
LED light source can be very small
In addition, fast response, but also a big advantage of LED light source, the average user may not understand, what is the use of the light source response speed, in fact, this advantage is mainly used in backlight technology, because the liquid crystal itself can not emit light, so the LED as a backlight response With fast speed, it can cooperate with the rapid change of the screen, can quickly close and open and close, increase the contrast of the screen, especially the use of precise control technology, it can also reduce the energy consumption of the device as a whole.
These advantages of LED are very obvious, its application in different areas, but also bring these advantages into the corresponding market, then we look at the application of LED technology in different markets.
LED lighting applications
The first is the field of lighting. The biggest advantage of LED in this field is the long service life, which makes the maintenance cost of the LED light source very low in the later period. Its own brightness is also good, can meet the general lighting needs, due to the small energy consumption required, its Also very energy-saving, so many of the renovation projects, LED light source is a good choice.
First of all, LED can be used for atmosphere lighting. Atmosphere lighting is different from demand lighting. With energy saving features, it can be turned on for a long time. Its multi-color advantages can be used to render different occasions. For example, the rest area can use warm colors. The LED is also perfectly adaptable when it comes to lighting and requires cool lighting.
LED light source can be used for atmosphere lighting
Secondly, LEDs can be used for outdoor lighting. Because the outdoor environment is not controllable, traditional light sources require more protective measures, and LED light sources do not require too many protective measures. Their own energy-saving effect can also be turned on for a long time. , coupled with long life, LED is very suitable for outdoor lighting, many neon lights are made using LED light source
Neon lights are basically the world of LED light sources
Finally, there is work lighting. In many special work environments, the light source must be stable and stable, and no errors can occur. This is the stability of the LED light source. It can be turned on for a long time, and the light source will not be attenuated quickly. There will be no instant extinguishment, so for a special working environment, LED light sources are also very necessary.
Application of LED backlight
Let's take a look at the development of LED technology in the field of backlight. The development of LED in the field of backlighting is actually very smooth. At present, this market has basically been completely controlled. The traditional CCFL backlight has been hard to trace, and this LED backlight is small in size. There is an inseparable relationship between energy saving and durability.
Close up of LED backlight
The LED TVs that the shopping guides are talking about are actually LED-backlit TVs. They are still the material of the LCD panel. However, since the LCD itself does not emit light, it needs backlighting. In the past, it was a lamp-type backlight, but the lamp tube used a lot of space. , so the old-fashioned LCD TVs are relatively large, can not achieve the effect of ultra-thin, and now LED-backlit TVs are relatively thin, it is because of the small size of the LED backlight, and the use of the side-mounted way, great Reduce the thickness of the LCD TV.
The “membrane†in the backlight module helps even illumination of the LED backlight
　 In addition, the display area is basically the world of LED backlighting. Therefore, manufacturers basically no longer promote the configuration of LED backlights. Since everyone is the same, there is no advantage at all. It can be seen how widespread the popularity of LED backlights is. Extensive, in the field of mobile phones and tablets, but also all the world of LED backlight, you can say that you can display the screen in the hands of the device, as long as the need for backlight support, 99% of the LED light source is silent work.
LED display applications
Many friends couldn't figure out what a LED TV is. Above, we said that LED TVs in current stores are all LED-backlit TVs. Actually, LEDs themselves can also present images. In LED features, we talked about LEDs that can present different colors. Therefore, as long as the size of the LED light source is small enough, or the viewer's distance is far enough, LED display screens can be used. This is the LED screen that we often see when shopping.
Common outdoor LED display
The picture displayed by the LED itself is actually very rough, so the size of the LED light source can not be too small, but due to the viewer's distance is far enough, it looks more clear, this type of outdoor large screen is characterized by the life It is long enough to have the stability of LED light source, and it is not afraid of wind and sun. This is an advantage that LCD or projection display technology cannot have. Therefore, the LED outdoor large-screen market is still very stable.
LED text display mode
In addition, the LED can also use a simple drive to achieve a monochrome display. Although this design can not display a color screen, but the display text is very easy to use, we can see this at the airport or train station, or on the bus The application of LED screens has low cost, long service life, clear display text, and wide application.
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