LED, It Is Where We Are
Along with the development of semiconductor technology, LED Street light, LED display, LED back light and other new affairs have been shown on people’s perspective.
The LED application in city lighting
The function of the city lighting is the indispensable conditions to ensure the people’s work life; The urban landscape lighting can beautify the city, bringing the city life and vigor, and improving the image of the city, providing the convenience to people’s work and life.
At present the existing public lighting equipments are mainly sodium lamp, metal halide lamp and mercury lamp, while the photoelectric conversion efficiency is not high, and power consumption is very large. In today’s global energy shortage environment, saving energy has become the general trend. Green, high efficiency, long life LED street lamp have come into people’s field of vision. The LED as street lamp basically has the following advantages: high luminous efficiency, low reflected energy loss which can save 70% energy; Cooperate with digital control brightness function which can save more power; Don’t need high voltage, thus to have high safety; Cooperate with software, the brightness can be made by the automatic control; in accidents, foggy and rainy day special cases, it provides high brightness and show color of high lighting light source; simple installation and maintenance; Module installation, no extra wiring; it won’t cause light pollution or waste; The long life means that it doesn’t need to be often replaced, reducing the potential of traffic interruption, thus reduced the pay of the cost of maintenance.
The application in automobile LED lighting
Car light source occupies an extremely important position in the field of lighting, and its production accounts for about 10% of the total output lighting source. The LED brake lights, compared with the traditional incandescent lamp, can work in smaller drive current, low power can reduce automobile internal line system bulk and weight. The LED brake lights have short response time, if the car in front brakes, the car behind can see the signal 0.7 s ~ 1 s earlier than traditional incandescent lamp brake light , and then give the driver more reaction time, and improve the driving safety guarantee.
At present, the car-used LED can be divided into automobile external use and the internal use two types, the internal parts include instrument panels, air conditioning, acoustics indicator light and internal reading lamp; External use includes the brake lights, tail light, turn signal, side lamp, etc. With optical performance has improved, LED package design is more specific and practical, it will provide larger development space for the more personalized, integration design. With the rapid development of technology, the price of LED has been constantly lower; the magnitude of reduction in the future will also increase, so it will be more widespread in the car use.
The LED application in house lighting
Household lighting has become the highlight of a modern life which can beautify the environment and improve the life quality. Household lighting requires source to achieve the comfortable environment and good lighting intensity of illumination standard quality in work, study and life condition, to objectively present the objects’ shade degree and color, thus to get direct observation of human eye external scenery reality effect. With high luminous efficiency, enough brightness, we should have the high color developing index close to natural light.
The application in LED back light
Back light is provided to be the light source of LCD panel, and mainly consist of LGP and plastic box etc. The display back light, as the most widely used LED field, accounted for about 40% of the LED application, such as cell phones, laptops back light etc. At present, the LED back light has marched to LCD TV.
First of all, compared with cold cathode fluorescent tubes, the traditional display device, using LED as a back light of LCD TV; it can improve picture quality, especially color saturation. Second, because of the plane light source characteristics, LED back light can achieve dividing-area color and chromaticity adjustment function that cold cathode fluorescent tubes could not be compared with. Again, in the shine life, LED backlighting technology is beyond the cold cathode fluorescent tubes. The common cold cathode fluorescent tubes backlight life is in 30000 h ~ 40000 h basically, but now the white LED back light life has up to 100000 h.
LED display applications
With the modern information display technology development, it formed the CRT, LCD, plasma displays, and so on series of information display products. With LED material technology and process level improved, using computer control, large screen LED display integrated with the light, electricity has been applied to many fields.