The classification of LED
甲基丙烯酸烯丙酯 We call the LED knowledge is a general term, actually with LED in the 60 years after the import business, after several years of development has been the development of many types, types of the mainstream.
(1) LED (Light emitting diode)
We call it the LAMP LED product, called P2 products, also called LED plug-in,anyway as long as it is to an in-line. And there are many kinds of LED type:
1) in colloidal form: 3mm, 4mm, 5mm, 8mm, 10mm, 12mm, square, oval,tombstone, and some special shape etc..
2) by colloid color: colorless transparent, colored transparent, colorless and colored scatt
ering, scattering.
3) according to the color: red (red), orange (Orange), yellow (yellow), yellow green (green yellow), green (green), blue and green (blue green), blue (blue),purple (pink), ultraviolet (UV), white (white), infrared and so on.
(2) SMD (Surface mount device)
Surface mount diode or surface mount components is his name, the inside also has many categories:
1) according to the shape size: 0603, 0805, 1210, 5060, 1010 and so on, the general SMD is rhombic, so its name is according to the length * width size to call,industry use are inches, not mm, useful also mm called, as 1608 (1.6*0.8mm).
2) emitting light colors and colloidal species and LED products, only the product shape changed greatly.
(3) the fish (Flux LED)
This is because the LED luminous efficiency can not meet the requirement of automobile use, so we developed this product, is a small power products, and the drive current in general 50MA, general LED 20MA, the highest current can reach 70mA, because of its heat dissipation is better, in general used car taillight.
His classification is based on colloidal shape different points: there are 3mm,5mm, flat, and according to the top of the beads to meet different customer requirements of different angle etc.. You"re like 30, 50, 70, 120 etc..
(4) and high power (power LED)
This you may be familiar with, is now the industry with the most heat. All fall over each other also
replace the existing lighting products. Don"t know what it"s like to have a look:
1) according to power: 1W, 3W, 5W, etc..
2) according to a top emitting lens: flat, the shape of glass, etc..
3) according to the process and the aluminum substrate and anti luminous.
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(5) the digital tube (Display)
This is the earliest you in to display and digital display.
1) according to the shape: 1, 2, 3, 4 etc..
2) surface color: gray black gum, also has the black glue etc..
3) polarity: Yin, yang.
4) color also like LED can do many kinds of.
(6) lattice (LED Dot Matrix)
We can know from the luminescence mechanism of LED device, the forward current to the LED device by a positive voltage when passing through the device makes the light. Therefore LED drive is to make it in the positively biased PN junction, and in order to cont
rol the luminous intensity, but also solve the problem of adjustment of the positive current. Driving mode specific DC drive, constant current drive, pulse drive and a scan driving, driving the LED device for DC drive mode
The characteristics of LED
LED through the PN node and the optical electrical conversion, its features are as follows.
(1).Energy saving.
LED has the characteristics of low voltage, low current, high pightness. The luminous efficiency than traditional 80%~90% energy-saving light source. Expected a few years later, the luminous efficiency of white LED could reach 150~200 LM now far exceeded other lighting luminous efficiency.
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(2). Environmental protection .
点钞机电机 LED cold light, glare, no radiation, does not produce harmful substances in use. LED environmental protection, no ultraviolet and infrared spectrum, and waste Recyclable, do not contain mercury, safe touch, belongs to the typical green lighting source. (3). Long life
LED mono tube lifetime is 100000 hours, the light source life of 20000 hours or more, according to the daily work in 12h computing, life in 5years. While the ordinary incandescent lamp life is about 1000h, fluorescent lamp, metal halide lamp life is no more than 10000H.
服务器部署 (4) firm structure.
LED using solid semiconductor chip will be converted to electrical energy, and epoxy resin
package, body and no loose parts, there is no filament burn ability, thermal deposition, depreciation and other shortcomings, can withstand high strength mechanical shock.
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