The Testing Of Reliability And Application For Led Product

By Author: Rihey
Total Articles: 115
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The technology of LED in recent years, with continuous improvement and process capability, product quality and service life of high-brightness increase, gradually expanding the application fields to the source as the indoor and outdoor lighting, LCD backlight module products, automotive lighting sets and other higher-end products. Furthermore, LED product generally small in size, power, non-toxic, with a directional light source, the advantages of low maintenance costs, and thus by the world attention once again, industry has therefore become an important development.

LED part structure can be divided into surface mount (SMD) and plug-in type (DIP) two broad categories. LED IC packaging components and materials used generally different, but similar and relatively simple structure. LED part of the main reliability test can be divided into: pre-process reliability testing, environmental life test, solder, heat resistance, static electricity (ESD) and other projects, and before and after the experiment to measure the optical properties of optical properties calculated recession as a benchmark to judge the case. By use of ...
... the environment and regional differences, to select the appropriate pilot projects to verify.

Pretreatment process for SMD-type LED, the purpose of simulation of LED assembly plant parts in the system, and use of more stringent conditions, forcing the parts after heat stress absorption test is the implementation of LED Component Reliability Testing of pre-treatment processes . 5cycle purpose is to simulate the temperature cycling test before use, including transport or filter any possible risk of premature deaths, after high temperature baking (Baking) then parts into moisture environment, the general moisture conditions on the SMD-type LED is usually Level 3 as the validation criteria, for outdoor use and high reliability requirements of the LED components are taken as a Level 1 certification standards. That shown in Fig.

The life of LED test environment is a major part reliability test items. By temperature, humidity, current portfolio of products such as life expectancy accelerated failure simulation, common projects and works as follows:

LED heat problem ,because the parts themselves for prolonged light stress model is adopted to accelerate the simulation of actual usage, and observe the brightness decay rate to estimate the life of the product value. High temperature accelerated life test is the most typical life ㄧ empirical methods to equation (Arrhenius' Law) to estimate the product in order to calculate the activation energy of high temperature acceleration factor. The following basic equation for the , Figure II was estimated activation energy Ea of the method.

Temperature cycling test is for the regular switch or the environment day and night temperature variation in the place (especially for outdoor use products) to high temperature and low temperature cycle accelerated testing, the aim of using part of thermal expansion coefficient mismatch, on the part structure of fatigue effect. The other power can use the temperature cycle test (PTC), is the dynamic simulation, in addition to temperature stress of things, adding the power points off factor (solar powered led lights), the reliability of the LED part authentication considerable benefits (china led lights), but the implementation of the pilot test circuit boards to be designed. from: led bulb light