Application introduction of super bright LED
Car signal indicator
The indicator lights of the car are mainly the direction lights, tail lights and brake lights on the outside of the car; the lighting and display of various instruments are mainly on the inside of the car. Ultra-high-brightness LEDs are used in automotive indicator lights. Compared with traditional incandescent lamps, they have many advantages and have a wide market in the automotive industry. LED can withstand strong mechanical shock and vibration. The average working life (MTBF) is several orders of magnitude higher than that of incandescent light bulbs, far higher than the working life of the car itself, so the LED brake lights can be packaged as a whole without having to consider maintenance. Transparent substrates AlGaAs and AlInGaPLED have a relatively high lumen efficiency compared to incandescent light bulbs with filters, so that LED brake lights and direction lights can work at a lower driving current, the typical driving current is only incandescent 1/4.
The lower power can also reduce the volume and weight of the internal wiring system of the car, while also reducing the internal temperature rise of the integrated LED signal lamp, allowing the lens and the cover to use plastics with lower temperature resistance. The response time of the LED brake light is 100ns, which is shorter than the response time of the incandescent lamp, which leaves more reaction time for the driver, thereby improving the safety of driving. The illuminance and color of the external indicator light of the car are clearly defined. Although the internal lighting display of the car is not controlled by the relevant government departments like the external signal light, the manufacturer of the car has requirements for the color and illumination of the LED.
GaPLED has long been used in cars, and ultra-high brightness AlGaInP and InGaNLED can meet the requirements of manufacturers in terms of color and illuminance, so they will replace incandescent lamps in cars more. From the perspective of price, although LED lamps are still more expensive than incandescent lamps, from the perspective of the entire system, there is no obvious difference between the prices of the two. With the practical development of ultra-high brightness TSAlGaAs and AlGaInPLED, prices have been continuously reduced in recent years, and the reduction will be even greater in the future.
Traffic signal indicator
Replacing incandescent lamps with ultra-high-brightness LEDs for traffic lights, warning lights, and signage lamps has now spread all over the world, the market is broad, and demand is growing rapidly. According to the statistics of the US Department of Transportation in 1994, there are 260,000 intersections with traffic lights installed in the United States, and there must be at least 12 red, yellow, and blue-green signal lights at each intersection. Many intersections also have additional transition signs and pedestrian crossing warning lights that cross the road. In this way, there may be 20 signal lights at each intersection, and they must emit light at the same time. It can be inferred that there are about 135 million traffic lights in the United States. At present, using ultra-high brightness LEDs to replace traditional incandescent lamps to reduce power consumption has achieved significant results. Japan consumes about 1 million kilowatts of traffic lights each year. After replacing incandescent lamps with ultra-high brightness LEDs, its power consumption is only 12% of the original.
For traffic lights, the competent authority of each country must formulate corresponding specifications, specifying the color of the signal, the minimum illumination intensity, the pattern of the spatial distribution of the light beam, and the requirements for the installation environment. Although these requirements are written for incandescent lamps, they are basically applicable to the ultra-high brightness LED traffic lights currently used.
Large screen display
Large-screen displays are another huge market for ultra-high-brightness LED applications, including monochrome, dual-color, and full-color displays of graphics, text, and numbers. Traditional large-screen active displays generally use incandescent lamps, optical fibers, cathode ray tubes, etc .; passive displays generally use the flop method. LED display has always been limited by the performance and color of the LED itself. Today, ultra-high brightness AlGaInP, TS-AlGaAs, InGaNLED can provide bright red, yellow, green, and blue colors, which can fully meet the requirements of full-color large-screen display. The LED display can be assembled into various structures according to the pixel size. The diameter of the small pixels is generally less than 5mm. Each pixel of the monochrome display uses a T-1 (3/4) LED lamp. T-1 (3/4) LED lights, full-color display requires 3 T-1 red, green, and blue lights, or a multi-chip T-1 (3/4) LED light as a pixel .
Large pixels are formed by combining many T-1 (3/4) red, green, and blue LED lights together. Use InGaN (480nm) blue, InGaN (515nm) green and AsAlGaAs (637nm) red LED lights as the three primary colors of LED display, can provide realistic full-color performance, and has a larger color range, including blue green, green red, etc. , Basically consistent with the TV color range specified by the International Television System Committee (NTSC).
The practicality and commercialization of solid-color lighting full-color ultra-high-brightness LEDs have made lighting technology face a new revolution. Solid-state lighting made of multiple ultra-high-brightness red, blue, and green LEDs can not only emit wavelengths Continuously adjustable light of various colors, and it can also emit white light with a brightness of tens of candles to 100 candles, becoming a lighting source. Recently, Japan's Nichia Company used its InGaN blue LED and fluorescent technology to launch a white solid-state light-emitting device with a color temperature of 6500K and an efficiency of 7.5 lumens per watt.
For incandescent lamps and LED solid lighting lamps of the same brightness, the power consumption of the latter accounts for only 10% to 20% of the former, the life of incandescent lamps generally does not exceed 2000 hours, and the life of LED lamps is up to tens of thousands of hours . This solid light source with small size, light weight, good directivity, energy saving, long life, and resistance to various harsh conditions will definitely have an impact on the traditional light source market. Although the cost of this new type of solid-state lighting source is still relatively high, it can be applied to special occasions, such as mining, diving, emergency rescue, and military device lighting. In the long run, if the production scale of ultra-high brightness LEDs is further expanded and costs are further reduced, the advantages of energy saving and long life are enough to make up for the disadvantage of high prices. Ultra-high-brightness LEDs may become a very competitive new type of electric light source.
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