In the ancient Greek mythology, God created the human Prometheus in order to enable people to obtain eternal light, at the highest angered God Zeus, to drive away the dark, bring warmth and light of the fire secretly brought to mankind, But they have been cruel punishment. This story not only illustrates the importance of light to mankind but also reflects the misery that mankind has to pay to pursue the path of light.

Before Edison invented the electric lamp in the 19th century, mankind realized the way of lighting is very simple, direct direct light with various fire sources, such as candles, oil lamp and so on. Although these light-emitting devices have ignited a long time in the long history of mankind, they can only be dust-sealed in historical museums due to their extremely low luminous efficiency and luminous quality. After the 20th century, with the outbreak of the new industrial revolution in human beings, Edison invented the new incandescent lighting as the representative of the official became the mainstream of human production and lighting equipment.

After the appearance of incandescent lamps, the human society's electric lighting basically went through three important stages of development. The representative light sources in these three stages are fluorescent lamps, high-intensity discharge lamps and LED light sources. Among them, high-intensity gas discharge lamp due to strict requirements on the use of the environment, high cost, is not currently the mainstream of civil lighting, so closely related to our daily life of light equipment, only incandescent, fluorescent and led light source of these three Category.

Among these three categories of light sources, LED lighting technology is the latest and most advantageous lighting technology. Therefore, since the emergence of the 1960s, with the development of modern semiconductor technology, it has been widely used, Especially into the 21st century, led by the LED lighting technology derived LED display technology and LED-assisted display technology, has shown more and more strong momentum of development.

In addition to the LED light source that is being popularized in the field of daily electric lighting, there are mainly two kinds of devices related to LED currently in the display field: one is to directly use the LED display screen of the LED imaging, and the other is to utilize the excellent light emitting characteristics of the LED, A new type of LCD TV used as a TV back light. Another high-visibility OLED display technology, although only one more letter than the LED, but due to the larger technical gap, can be seen as a new class of display technology, it is not within the scope of this article.

So what is the principle of LED technology? What are the advantages of LED technology compared to incandescent and fluorescent lamps? LED display equipment and LED-assisted display equipment and what is it? This is the three aspects to be elaborated in this article.

LED lighting technology principles

LED is English abbreviation of light emitting diode, namely: light excitation diode, belonging to a kind of semiconductor component. The core of the LED is a wafer of p-type and n-type semiconductors, with a transition layer between the p-type and n-type semiconductors called the pn junction. In some PN junctions of semiconducting materials, injected minority carriers, in combination with majority carriers, release excess energy in the form of light, converting the electrical energy directly into light energy. PN junction plus the reverse voltage, a minority of carriers is difficult to inject, it does not light. The use of this principle of injection electroluminescent diodes called light-emitting diodes, commonly known as LED.

When it is in the forward working state (that is, both ends plus forward voltage), current flows from LED anode to cathode, the semiconductor crystal emits light of different colors from ultraviolet to infrared. The intensity of light is related to the current. For example, LED is like a burger, the shiny material is the "patties" in the mezzanine, and the electrodes on the top and bottom are the breads that clamp the meat. Through the study of luminescent materials, people gradually developed various light colors, LED components with higher and higher luminous efficiency, but no matter how the LED's overall luminescence principle and structure have not changed much.

LED light source advantages

As a kind of lighting technology with the latest appearance time, the advantages of LED are not only reflected in the luminous quality, but also greatly surpass traditional light sources such as incandescent lamp and fluorescent lamp in its production, manufacture and usability. Since its birth in the 1960s, Got a great development and application. As opposed to incandescent, fluorescent and other older generation of light-emitting devices, LED's advantages are mainly reflected in the following aspects:

1.LED structure in the absence of glass shell, do not need to incandescent or fluorescent lamps in the vacuum tube or into a specific gas, so the earthquake, impact resistance is good, to the production, transportation, use of all aspects of convenience.

2.LED components can do very small volume, more convenient for a variety of equipment layout and design.

3.LED light emitted by the high concentration of energy concentrated in the smaller wavelength window, high purity.

4.LED components of the life is very long, generally between 50,000 -10 million hours, even if the switch is frequent, it will not affect the service life.

5.LED response time is very fast, in the microsecond level.

6.LED's luminous point is very strong, the brightness attenuation is much lower than traditional light sources.

7.LED in the production process do not add "mercury", very environmentally friendly.

8.LED low-voltage direct current can be driven, the use of the environment less demanding.

These advantages of LED luminaire not only lay a solid foundation for its extensive application in daily lighting field, but also create a promising road for LED into display field.

However, LED is not from the very beginning has so many advantages, but also after a long period of development, let's look at the LED from birth to now have undergone the development and changes in the road.

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