This article mainly introduces the related applications of thermal imager in LED, an electronic industry with unlimited development prospects. In the production and use of LED, the actual life of LED is inversely proportional to its operating temperature. It is mainly attributed to the extremely poor photoelectric conversion efficiency of LED. Only about 15% to 20% of the electric energy is converted into light output, while the rest is converted into heat energy. Therefore, when a large number of high-power LEDS are used in a module for high-brightness during operation, these extremely poor conversion efficiency will cause a big problem in heat dissipation.
In terms of product heat dissipation and quality testing, thermal imager plays a huge role. It can not only be used in the research and development process of LED, but also can be used in product quality management. So it's important to find a good and affordable thermal imager.
Generally, it mainly focuses on LED module drive circuit (including power supply), light source semiconductor heat distribution analysis, and light decay testing.
1. LED module drive circuit
In the development of LED products, engineers are required to design a part of the drive circuit, such as a rectifier circuit module. Using a thermal imager, engineers can quickly and easily find the temperature abnormality on the circuit, which is convenient for perfecting the circuit design.
2. LED light source semiconductor chip heating
Using a thermal imager, engineers can analyze the temperature of the chip during operation and the temperature distribution based on the obtained infrared heat map of the semiconductor chip of the light source. On this basis, the purpose of improving the life of the LED product can be achieved.
3. Light decay test
The light attenuation of LED products is the weakening of the signal during transmission. At this stage, the LED products made by major LED manufacturers around the world have different degrees of light attenuation. The high-power LEDS also have light attenuation problems. Light attenuation is directly related to humidity, which is mainly determined by the product, phosphor and packaging technology. At present, the light decay of white LEDS on the market may be one of the most important issues in the march to civil lighting.
Quality management of thermal imager
1. Semiconductor lighting: uniformity of blown bulbs
The thermal imager captures the process of glass blowing on the production line, corrects the parameters and improves the pinch process, which can effectively increase the product yield and reduce costs.
2. Temperature management of LED inspection chip packaging
Detecting the temperature before the LED chip is packaged can avoid the abnormal temperature of the chip after the package and reduce the rejection rate.