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Classification of LED display screens

Thursday, November 19, 2015 10:57:29 PM America/Los_Angeles

LED electronic display screen is an electronic display, which is combined with computer technology, information processing technology, electronic technology, phonology, chromatics and other high and new technologies. The LED display screen can be divided into monochrome screen, double color screen and full color display.
Full color display of LED screen can be divided into indoor and outdoor screens. In general, there are two driving methods, one is the change of current LED whose operating current had better be set below 20mA, and the other one is that using human visual inert, gray control can be realized with pulse modulation. People’s feeling about the average brightness of pixel depends on its duty ratio, which can change periodically. As long as the cycle is short enough, human eyes will not feel its duty ratio.
With the improvement of green chip brightness and the drop in price, the full color display is being popularized and promoted at unprecedented speed. Especially, the appeal of Beijing "Green Olympics" makes market prospects of the full color LED display more and more attractive. With the development of more than ten years, the progress of domestic display manufacturers is very fast. However, compared with the developed countries of Europe, America and Japan, there is still a certain gap, especially in the packaging technology of LED display devices and design level.

 

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Application status of semiconductor lasers

Friday, October 9, 2015 1:06:25 AM America/Los_Angeles

As semiconductor laser has the advantages of small size, simple structure, high electro-optical efficiency, long service life, easy modulation and low price, so it has a wide range of applications.

In optical fiber communications, which have become the mainstream of modern communications, semiconductor laser is the only practical light source. Now, it is the fastest growing and the most important light source in the optical communication field.

In laser ranging, semiconductor laser range finder has the characteristics of light weight, small volume, and its error is only hundredth or fifth that of other Optical rangefinders.

In the processing of precision instruments, using high energy ultra short optical pulse generated by Q switch semiconductor laser, the integrated circuit can be cut and drilled. And in general mechanical processing, the high power semiconductor laser also began to be used in soldering, transformation hardening of material surface, material surface cladding, material connection, materials, Titanium alloy surface treatment, laser cleaning, auxiliary machinery processing aspects etc.

In the information storage applications of optical integration, people use short wavelength to readout optical content and use blue and green laser to increase the storage density.

In the application of information processing, two-dimensional array of surface emitting semiconductor laser is the ideal light source of optical parallel processing system, which can be used in optical computing and neural network.

In the military application, semiconductor laser is mainly used for the laser radar, laser ranging, laser fuze, laser guidance and tracking, laser sights and laser gyro.

In addition, the semiconductor laser is also used in environmental monitoring and medical treatment. In environmental detection, people monitor air pollution and automobile exhaust by using the analysis of spectrum to analyze ambient gas. In medicine, semiconductor laser is not only used for soft tissue excision, tissue engaging, coagulation and vaporization, also used in photodynamic therapy.

 

Keywords: laser, semiconductor laser, laser application

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Application prospect of thermoelectric cooling technology in temperature control of composite materials

In practical application, the thermoelectric modules are often placed inside of devices, and even they can be directly combined with devices needing refrigeration into a whole. For example, in optical application, the thermoelectric module can be a part of a detector or diode; in a semiconductor device, it can become a whole with the ceramic package. This lays the foundation for developing composite materials with temperature control-structure integration or even intelligent temperature control composite materials.

Especially with the further miniaturization of the refrigeration module structure, the adverse effects of internal contact layer resistance, heat conduction and thermal radiation will be more significant. Therefore, the thin film integrated structure with strong compatibility will become the mainstream development direction of microelectronic cooling technology.

Thus, thermoelectric cooler (TEC) with the integrated design and integration technology of aerospace vehicles in the aspects of function and structure satisfies the future development trend of thermoelectric cooling technology, especially in the application of aerospace. Based on composite materials of TEC temperature control and intelligent temperature control, the organic combination of TECs, structural materials and functional materials is a major development direction of future application of thermoelectric cooling technology.

If you have any questions and suggestions about TECs, please feel free to contact us. We will be very happy to receive your feedback.

Our web site is http://www.analogtechnologies.com/

Keywords: TEC, thermoelectric cooler, thermoelectric module

 

0 Comments | Posted in News By Fang Liu

Analysis of LED market prospects

Monday, September 14, 2015 2:13:36 AM America/Los_Angeles

LED is the abbreviation of light emitting diode, which is a solid light emitting device of semiconductor. Using light emitting materials of solid semiconductor chips, carriers in semiconductor will composite, cause photon emission and produce light, when the two ends of LED are with forward voltage. LED can directly emit red, yellow, blue, green, green, orange, purple and white light.

Our country has huge lighting market of LED and also has strong industrial foundation of lighting. With the development of semiconductor lighting technology, performance improvement of LED lighting and the reducing of cost, China's LED lighting market outlook will gradually appear.

(1)   The huge demand of lighting.

In our country, lighting market is very huge because traditional lighting sources have disadvantages of big energy consumption, low brightness and unsafe. LED lighting will replace the traditional light source and lamp.

(2)   A good lighting industrial base.

As lighting industry foundation is very strong, our country is the world's largest producer of lighting sauce and light lamps. According to statistics of China Lighting Electric Appliance Association, in 2010, the outputs of national incandescent lamps are 3.8 billion and fluorescent lamp production are 6.69 billion, of which the yields of fluorescent lamps of straight tube are 1.83 billion, the yields of ring-shaped fluorescent lamps are 1.8 billion and the yields of CFL are 4.43 billion. In 2010, the national production of HID lamp is 174 million, of which high pressure mercury lamp production is 56 million, high pressure sodium lamp production is 54 million, and metal halide lamp production is 63 million. At the same time, China's lighting consumption is mainly provided by the domestic production enterprises, andthe imported products accounted for less than 5% in the domestic consumer market. Nearly 70% of domestic production is for export. A good lighting industrial basewill not only provide a reliable supply of products in domestic market of LED lighting, but also provides a very good support of promoting cost performance of LED through scale effect.

(3)   Government support policies

From a policy perspective, the State supports the LED lighting industry development through establishing the engineering research of national semiconductor lightingand industry alliance, introduce related financial support measures, policies and regulations and other means. Through fiscal subsidy way, the yields of efficient lighting products will be more than 150 million. In order to make the policy benefit more residents in rural areas, it is clearly demanded that the promotion proportion is not less than 30% of the total in this year. In addition, China will also produce hold the LED street lamps, landscape lighting and large billboard projects, which are needed in large-scale activities. These will have a great inspiration for LED industry prospects.

With the development of economy and technology, it is believed that LED will be more and more popular.

0 Comments | Posted in News By Fang Liu

The advantages and disadvantages of TEC and its development status (I)

Sunday, September 6, 2015 7:47:37 PM America/Los_Angeles

Thermoelectric cooler (TEC) is an ancient technology. As early as in the 1950’s, TEC has once set off a boom. When it is connected to a power supply, it can become cold, which is very popular among home appliance manufacturers. However, because of the poor performance of components, it failed to be applied in actual life. The key, which determines the rise of decline of materials and process of TEC, is to improve figure of merit and the cooling effect of the hot and cold end.

In order to meet the cooling requirement, TEC materials not only need N and P type semiconductor properties, but also need thermoelectric potential, electric conductivity and heat conduction rate of semiconductor added impurity. Production of traditional TEC materials mainly use zone-melting method and powder metallurgy method, but the production cost is very high and the equipment process is also very complicated. At home, the common used materials are on the basis of Bi2Te3, P type is Bi2Te3-Sb2Te3 and N type is Bi2Te3-Bi2Te3. The vertical zone melting method is used for extracting crystal materials. The optimization coefficient of thermoelectric elements produced in this way is only 3×103K-1, which can result in low cooling efficiency. When the temperature difference is 50℃, the cooling coefficient is only 0.06. Only if the optimization coefficient is up to l3×103K-1, the cooling efficiency can be the same with the compression refrigeration efficiency.

Therefore, because of early technology and process constraints, the TEC efficiency is too low, so TEC haven’t received enough attention and application.

If you want to know more, please feel free to contact us.

Our web site is http://www.analogtechnologies.com/

Keywords: TEC, TECs, thermoelectric cooler

 

0 Comments | Posted in News By Fang Liu