As a new type of light source, led has received extensive attention due to its energy saving, long life and no pollution. Especially during the Beijing Olympic Games, the successful application of a large number of LED technologies has achieved unexpected results. In recent years, various local governments have supported the LED industry, which has led to a large number of companies involved in this field. 2010 is the first year of the domestic LED light source industry to become popular: more than half of the world's LED lighting projects are completed by Chinese enterprises. The penetration rate of LED flashlights to the traditional flashlight market is over 80%, and the total market size of LED display products is increased. The innovation is high, and at the same time, the cost of LED light source products has dropped by more than 50% compared with a few years ago... This has brought us new understanding and thinking about LED products.
First, the LED light source overview
LED (Light Emitting Diode) LED is a solid-state semiconductor device that directly converts electricity into light. The heart of the LED is a semiconductor wafer with one end attached to a holder, one end is the negative pole, the other end is connected to the positive pole of the power supply, and the entire wafer is encapsulated by epoxy.
It is an LED energy-saving lamp applied to the light source. It uses high-brightness white light-emitting diode as the light source. It has the advantages of high luminous efficiency, low power consumption, long life, easy control, maintenance-free, safety and environmental protection. It is a new generation of solid cold light source. It is more energy-saving, brighter, farther, and better in light-emitting performance than tubular energy-saving lamps.
Second, LED light source characteristics and advantages
1. Efficient and energy-saving: It only consumes a few kWh in a thousand hours (the ordinary 60W incandescent lamp consumes 1 kWh for 17 hours, and the ordinary 10W energy-saving lamp consumes 1 kWh for 100 hours).
2, long life: semiconductor chip light, no filament, no glass bubble, not afraid of vibration, not easy to break, the service life can reach 50,000 hours (the average incandescent lamp life is only one thousand hours, the average energy-saving lamp life is only eight In hours.).
3, can work in the high-speed state, if the energy-saving lamps are frequently turned on or off, the filament will quickly turn black and break.
4, solid state packaging: belongs to the type of cold light source. Therefore, it is very convenient to transport and install, can be installed in any miniature and closed equipment, is not afraid of vibration, basically does not need to consider heat dissipation.
5, LED technology is advancing with each passing day, its luminous efficiency is making amazing breakthroughs, and prices are constantly decreasing.
6, is conducive to human health: the light does not contain ultraviolet and infrared rays, no radiation (normal light lines contain ultraviolet and infrared).
7. Green and environmental protection: It does not contain harmful elements such as mercury and antimony, which is good for recycling and disassembly, and does not cause electromagnetic interference. (Ordinary lamps contain elements such as mercury and lead, and electronic ballasts in energy-saving lamps generate electromagnetic interference. ).
8. Light distribution technology expands the LED point light source into a surface light source, increases the luminous surface, eliminates glare, sublimates the visual effect, and eliminates visual fatigue.
9. Integrated design of lens and lampshade: The lens has the function of concentrating and protecting at the same time, avoiding the repeated waste of light, and making the product more simple and beautiful.
10. The high-power LED planar cluster package and the integrated design of the heat sink and the lamp holder fully guarantee the heat dissipation requirements and service life of the LED, and fundamentally satisfy the arbitrary design of the structure and shape of the LED lamp, and have the distinctive features of the LED lamp. .
11, protection of vision: DC drive, no stroboscopic (normal light is AC drive, it will inevitably produce stroboscopic).
12, high light efficiency: low heat, 90% of electrical energy is converted into visible light (80% of ordinary incandescent energy is converted into heat, only 20% of electrical energy is converted into light).
13, impact resistance, strong anti-light: no filament and glass shell, no traditional lamp tube fragmentation problem, no harm to the human body.
14. High safety factor: The required voltage and current are small, the heat is small, and there is no safety hazard. It is suitable for high-risk places such as mines.
15. Strong environmental adaptability and great market potential: low voltage, DC power supply, battery and solar power supply, suitable for remote and mountainous areas and outdoor lighting, such as lack of electricity and less electricity.
16, work under low thermal voltage, safe and reliable: surface temperature ≤ 60 ° C (ambient temperature Ta = 25 ° C).
17, wide voltage range, global common: 85V ~ 264VAC full voltage range constant current, to ensure that life and brightness are not affected by voltage fluctuations.
18, using PWM (pulse width modulation) constant current technology, high efficiency, low heat, high constant current accuracy.
19, reduce line loss, no pollution to the power grid: power factor ≥ 0.9, harmonic distortion ≤ 20%, EMI meets global indicators, reducing the power loss of the power supply line and avoiding high-frequency interference pollution to the power grid.
20, universal standard lamp holder, can directly replace the existing halogen lamp, incandescent lamp, fluorescent lamp.
21, luminous efficiency can be as high as 80lm / W, a variety of color temperature optional, high color rendering index, good color rendering.
Third, the application of LED light source in the film and television industry
(1) Application of LED light source in video display industry
The rapid maturity of the LED light source industry and the expanding application range have also affected the display industry. In the IT industry, LEDs are mainly used in display devices, such as notebook screens, LCD TVs for LED light sources, DLP videowalls for LED light source back projection, micro projectors for LED light sources, business and home projectors, etc. The application of the market has developed rapidly.
With the acceleration of the entertainment and digitization of the projector, some LED projectors with a brightness of about 200 lm have also come out, and the price is relatively reasonable. Experts in the industry believe that LED light source, whether it is general lighting or LCD TV, projector and other systems as a display light source, its positioning must be "a comprehensive replacement of the original technology", is a product that will certainly be fully popularized. Moreover, this process of popularization should be very rapid. The LED light source industry belongs to the traditional semiconductor industry, and is very similar to the industrial process and pattern of semiconductor devices such as memory and CPU. At the same time, the concentration of the LED industry, especially the concentration of upstream and midstream technology is not high, from the semiconductor material growth, chip, epitaxy, packaging, etc., more companies are involved. It can also be seen from the speed and degree of improvement in the luminous performance and price drop of LED light source products in recent years, which is an emerging product that can be rapidly popularized.
(II) Application of LED light source in movie screen
As a novel electronic dynamic graphic dot matrix display, LED movie screen is an information publishing medium that can be automatically and continuously operated in the public. It is a wonderful embellishment that can set off the atmosphere and decorate the environment. It is a kind of The most cutting-edge advertising attracts thousands of eyeballs. Individuals from merchants to big brands can use LED electronic scrolling displays to attract customers, introduce products, highlight the spleen and decorate the environment! Create greater wealth for merchants.
LED displays have evolved into many types.
(1) LED display can be divided into: single primary color display, double primary color display, full color display according to color base color.
(2) LED display screen can be divided into: LED digital display, LED dot matrix graphic display, LED video display.
(3) LED display screen can be divided into: indoor display, outdoor display, LED bar screen, bar curtain wall, all kinds of special-shaped screen, cylindrical LED display, blind LED display, inkjet LED display.
Fourth, the application of LED light source in stage lighting art
As a form of visual art expression, LED stage lighting art has been widely used in foreign countries, but it has only appeared on the stage since 2007 in China. It was fully applied and displayed in the opening and closing ceremonies of the 2008 Beijing Olympic Games. Compared with traditional stage lights, LEDs are very expressive and have a strong artistic tension; they can simulate real scenes, reproduce nature and display effect images. It has the flexibility that traditional sets can't match, and has lighting system. With some of the characteristics of the light source, the amount of information obtained by the viewer from the image is much larger than that of the physical carrier of the traditional stage art scene and lighting. The virtual image created by it gives us the space to imagine. The perfect combination of light and shadow and art. The microcomputer-controlled LED stage light products can make the fastest combination of light effects according to the requirements of the erection venue and program to achieve the most perfect lighting atmosphere. This is a new feeling for the audience. LED technology has provided a new way of displaying lighting for film and television performances and TV studios.
At the previous Beijing International Radio, Film and Television Equipment Exhibition (BIRTV), well-known foreign companies such as Barco, Mitsubishi, and Association Media have also demonstrated the latest equipment such as LED display screens and background walls. The application of LED has expanded from the initial signal indication to a vast space - film and television stage lighting. The addition of LED technology has injected new vitality into the stage lighting of film and television.
According to industry insiders, the initial installation cost of LED stage lights at the venue is still much more expensive than traditional lighting, but the maintenance and usage costs are much lower than traditional stage lights, saving on electricity consumption and lamp equipment costs. The cost cannot be ignored. In addition, since the LED is a cold light source, heat generation is small, and the cost of the air conditioner is also reduced, which saves a small amount of expenditure. While the whole society vigorously advocates low-carbon life, the use of LED stage lighting is of great significance for energy conservation and environmental protection.
Of course, as a new light source technology, the current large-scale replacement of traditional stage lighting for LED stage lighting also needs to solve some technical problems, such as improper use and glare in front of the camera, the optical angle is not adjustable. However, these problems will not hinder the large-scale application of LED stage lamps, because these problems will be continuously improved in design, manufacturing, application, etc., and the artistic effect of LED stage lighting will be more perfect and will be widely applied more quickly.
Editor: Li Jie
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