LED(Light Emitting Diode)

LED  = Light Emitting Diode, Emitting Diode,is a kind of can convert electric power into the visible solid-state semiconductor device, it can directly put DianZhuan into Light. LED = about Electronic put, Large Electronic Display, LED disseminatus, spread erythematosus = showed sexual Lupus erythematosus, a chronic, idiopathic autoimmune disease, Leds are organization past tense and past participle, meaning "leadership, lead."

ED products and little common sense

Leds (Light Emitting Diode) - - is an able to convert electric power into the visible semiconductor, it has changed the incandescent lamp glow and tungsten energy-saving sanki pigments glowing principle, and use electric field to shine. According to the analysis, the LED characteristics very prominent, long service life, high efficiency and low consumption, no radiation. LED spectral almost exclusively focused on visible spectrum, the luminous efficiency can be over 150lm/W (2010). Will LED with ordinary incandescent lamp, spiral energy-saving lamps and T5 three colors fluorescent lamp, comparing the result shows: the normal bulb efficiency for 12lm/W, life is less than 2000 hours spiral energy-saving efficiency for 60lm/W, life is less than 8000 hours, T5 fluorescent is 96lm/W, life span is about 10,000 hours and the diameter of 5 millimeter of white LED lights can exceed 150lm/W, life can be more than 100,000 hours. Someone also predict that future LED life cap will be infinite.

High power, refers to shine in power, generally refers to 0.5 W, 1W leds 3W 5W or higher. Light intensity lumens is better than small power, but also heat is very big also, now high-power are single application, add big heat sink. Small power is usually about 0.06 W. The plugin and man-eating fish etc. Now LED flashlight is commonly used in small power, light scatter not scattered, depends on the LED light emitting Angle, have large Angle of small Angle of points, small Angle scattered, large Angle only scattered. The flashlight on market is usually use straw hat head. The effect is very good. Now worry some manufacturer is not heavy quality, take the defective LED flashlight do, can't use how long is the death lamp.

With the brightness leds is LED light emitting Angle has inevitable relation, LED the Angle of the smaller its brightness is taller, no ultra bright not ultra bright, that is, if it is tricked child good quality LED whether that LED manufacturers almost everyone's brightness, only production process is different, the service life is slightly different, because everyone to use all is that several foreign LED chips. If it is LED180 5MM of the Angle of white brightness, if only a few hundred MCD is 15 degrees Angle will go to the brightness of more than 10,000 20,000 MCD brightness, brightness difference dozens of times, if it is used for lighting, outdoor preferably by high power LED, brightness is higher, a single power have 1W leds, 3W, 5W, still have a plenty of use multiple high-power combined into one large power, the power to LED to several hundred.

Color and brightness is ok, mild brightness and lumen. Value relevant

See several concepts:

Flux (lm)

Due to different wavelength of eye electromagnetic wave with different sensitivity, we cannot directly with light radiated power or radiation fluxes to measure the light energy, must adopt the feeling of human eye optical capacity of the benchmark units - flux to measure. Flux Φ said, the unit use symbols for lumen (lm).

The luminous intensity (CD)

Flux is to specify a light around to the total space emit light energy. Different source of flux issued in space distribution is different. The luminous intensity units for high-security, symbol for CD, it said in a unit QiuMianDu LiTiJiao light (the surfaces of point light form the Angle) within the flux emitted. 1 CD = 1 lm / 1 sr (sr: the LiTiJiao QiuMianDu unit).

Luminance (CD/m 2.)

Brightness is said eyes in a certain direction see objects launching light intensity. The unit is high-security/m2 [CD/m2], symbol for L, show in a particular direction LiTiJiao emanations units per unit area of the flux, it is equal to one square metre surface out on 1 high-security the luminous intensity.

Colour Temperature (Co1or Temperature)

When light source the light color and blackbody radiation in a certain temperature under the color photograph of temperature is bold, meanwhile, is called the illuminant colour temperature and in absolute temperature K said. When light source the light color and blackbody radiation at a temperature of color approached, the bold temperature is called the light of relevant colour temperature.

Basic information

Surface Emitting Diode (LED), Light Emitting Diode, is a kind of solid semiconductor devices, it can directly put DianZhuan into Light. The LED hearts is a semiconductor chip, wafer attached at the end of a stent. The other is negative, another end connection power the anode, make whole wafer by epoxy resin bundle. Semiconductor wafer consists of two parts, one part is P type semiconductor, within it the cavitation dominant, the other side is n-type semiconductor, in this major is electronic. But these two kinds of semiconductor connected between, they form a "P - N tie". When electricity flows through a wire in the role of the chip, electron would be to P area, in P zone with compound cavity electronic, then as photons form emit energy, this is LED principle. And the wavelength of light light color, is decided by forming P - N "material decision.

LED application

In view of the LED on their own advantages, which are mainly used in the following several aspects:

(1) screen, traffic signals shows light application LED lamps and lanterns seismic impact resistance, light, fast response time, save electricity and long life and other characteristics, widely used in all kinds of indoor and outdoor full-color display, divided, three colors and monochrome screen, the national total more than 100 units in the development of production. Traffic lights mainly using ultra bright red, green, yellow LED, because using LED lights already energy-saving, reliability and tall, so in the national scope, traffic lights are gradually being replaced, and promote speed, market demand is very big, is a very good market opportunities.

(2) auto industrial application of the car with the lamp contains automobile internal dashboards, acoustics indicator and switch back light, reading lamp and external brake light, tail light, side lights and head lamp, etc. Car USES incandescent lamp will not endure the vibration impact, easy attaint, short life, need often replaced. In 1987, our country begins in the car setup high brake light. Due to the fast response, can LED early remind driver brake, reduce rear-end accident, in developed countries, use LED manufacturing central rearmounted high brake light has become automobile fasteners, American HP company in 1996

Launched LED automobile tail light module can optional combination into various automobile tail lights. In addition, in auto dashboards, and other various lighting part of the source of the light, high brightness LED all available to bear, and so are in gradually using LED display. Automobile industry in our country is in great development period, is promotes brightness LED extremely good timing. In recent years the form annual output value of 10 million yuan, in 5 years will form the annual output value of 30 million yuan.

(3) LED back light to efficient lateral glowing back light most conspicuous, LED as LCD back light application has long life, high luminous efficiency, without interference and high performance-cost ratio, has been widely used in electronic watches, mobile phones, BP machine, electronic calculators and the inductor, along with the portable electronic product increasingly miniaturization, LED back light more advantages, therefore back light manufacturing technology will provide more light-weight, low power dissipation and uniform aspect development. Leds are key components, an ordinary mobile phones or small quick need about only use 10 LED device and a colour screens and with photographic function of mobile phones are need to use about 20 only LED devices. Present mobile phone back light dosage is very large, with 35 million a year to LED chips. At present our country mobile phone production is very big, and most of them LED back light or imported for domestic LED products, it was a very good market opportunities.

(4) LED lighting source early products luminous efficiency is low, the light intensity normally only reach several to dozens of MCD, suitable for indoor occasion, in the home appliance, instrumentation, communication equipment, computer application and toys. The direct target is LED lights replace incandescent and fluorescent, the substitution trend has from local application fields began to grow. Japan for saving energy, is planning to replace incandescent light emitting diode (called "project light Japan"), the first five years of budget for 50 million yen, if LED alternative half of the incandescent light bulb and fluorescent, equivalent to 60 billion every year and can save the energy equivalent liters of crude oil, five 106kW nuclear power plant capacity 1.35 x, and can reduce carbon dioxide and other greenhouse gas emissions, improving people's living environment. China also in 2004 investment of 50 million vigorously develop energy-saving semiconductor lighting scheme.

(5) other applications such as a children's welcome by the flash shoes when walking, built-in LED shine luminescence, wenzhou region only want to use 5 million a year light-emitting diodes (leds), Using light-emitting diodes as electric toothbrush power indicator light, according to domestic production manufacturers are introduced, the company has little care toothbrush listed, is expected to batch production needs every year to 3 million luminous lights, The being popular Christmas lights, LED because modelling novel, rich color, non-friable broken and low-pressure use security, recently in Hong Kong and other southeast Asia craft strong, by people generally welcomed, are threats and replace existing electricity bubble of Christmas market.

(6) household indoor lighting of LED products and more popular, LED canister light, LED days lanterns, LED fluorescent lamp, LED lamp has crept into the optical fiber family!

LED advantages

LED the inherent characteristics of determines that it has many advantages, such as:

A, small volume

Leds is basically a small chips being sealed in the epoxy resin inside, so it is very small, very light.

Second, low power consumption

LED power consumption is quite low, the dc drives, low power consumption (single pipe 0.03-0.06 watts), and fired power conversion close to 100%. Generally speaking the LED working voltage is 2-3.6 V, working current is 0.02-0.03 A; This means that it consumes electricity not more than 0.1 W, same illume effect than traditional light energy saving more than 80%.

Three, long service life

Some called LED source for longevity lamp. It for solid cold light, epoxy encapsulation, light body also without loosing part, there is no filament burn, thermal luminescence yi sedimentary, light failure in the appropriate shortcomings of current and voltage, by the use of life can reach 6 million to 10 million hours than the traditional illuminant long life up to 10 times.

Four, high brightness, low in calories

Leds luminous technology using cold, heat much lower than normal illumination luminaries.

Five, environmental protection

Leds are made by non-toxic materials, not as fluorescent aqueous silver can cause pollution, at the same time LED also can recycle. No ultraviolet and infrared spectra, already no heat, no radiation, the glare of small, cold light, can touch, belong to safety typical green lighting source

Six, durable

LED by completely sealed in the epoxy resin inside, than light bulb and fluorescent tubes are strong. Lamp also without loosing body parts, the LED is not easy to damage.

LED lamp

Seven, more irregular change

LED light-source available red, green and blue three colors principle, in computer technology under control make three colors with 256 level gray and arbitrary mixed, can produce 256 x 256 x 256 = 16777216 colors, formation of different light color change multiterminal, realize the combination of rich and colorful dynamic change effects and various images.

Eight, advanced technology

With traditional illuminant drab glow effect is compared, LED light-source low-pressure microelectronics products. It successfully blend computer technology, network communication technology, image processing technology, embedded control technology, so also is digital informatization product, is the semiconductor photoelectric device "high technology, has pointed" online programming, infinite upgrades, flexible characteristics.