[Text / high-tech LED Yue Mengdi] GGII research data shows that by 2017, COB will account for about 15% of the output value of LED lighting packaging, and has a large market in the commercial lighting field. After nearly 6 years of development, the advantages of COB in the field of LED lighting are undoubted.
Hongchao COB “Headman†and engineering technology research and development manager Shi Chao believes that COB development has encountered some bottlenecks. There are some controversial topics about COB, and some “non-public secrets†hidden in it are also unveiled.
Engineering Technology R&D Manager - Shi Chao
LED development has been moving forward, from the initial functional requirements to the current pursuit of light quality and aesthetic design, COB came into being. However, COB faces the problems of diversified size, no power, and high requirements for driving power. This series of standards is difficult to determine, which affects the automation of COB. The popularity of automation directly restricts the development of COB.
In fact, after nearly six years of development, the advantages of COB in the field of LED lighting are undoubted. The development of COB of Hongli Optoelectronics has always been around emerging materials. It is also due to the early layout. At present, Hongli Optoelectronics has 4 fully automated production lines in COB packaging. In 2015, it will expand to 8 and the monthly production capacity will reach 3000k. .
COB has a wide range of applications, and the color rendering index of light is getting higher and higher. The light engine and chip-level CSP are two special types derived from COB, which can achieve more cost performance, higher reliability and higher optical density. . "Hongli Optoelectronics has also studied (in the field of CSP) for a long time, not so much COB, maybe DOB is more suitable." Shi Chao believes that flip-chip is concentrated on two extremes - low-end and high-end.
In fact, from home lighting to office lighting, from commercial lighting to industrial lighting, COB can be tried and provide relevant intelligent support. The application of COB is so imaginative, and there should be some details in the application. “For example, the thickness of thermal grease coating, the application of the snap kit, the inability of the light-emitting components to touch, etc., all need engineering and technical personnel to communicate carefully with the customer.†Shi Chao summarizes the process of daily contact with customers. Need to pay attention to the problem during the COB application process.
High-quality lighting creates a comfortable and pleasant environment while displaying products. COB lighting solutions are used to maximize the application characteristics of COB technology, which can fully meet the diversified needs of different applications such as Shangchao, office lighting, restaurants and hotels. Jiao Li, senior product manager of Hongli Optoelectronics (300219.SZ), believes that there are five major factors affecting COB light quality: Rf&Rg dual index, standard color, reference light source, colorimetry and color distortion icon.
However, a good luminaire is not only the quality of the light source, but also the matching reflector and driving power supply will affect the lighting and life of the lamp.
Dalkco General Manager Xiong Dazhang
The choice of secondary optics is important in order for COB to achieve better lighting. Xiong Dazhang, general manager of Zhongshan Dalco, pointed out that the effect of the lens is that there is no sub-light class, and the light shape is more beautiful. If the TIR design is adopted, the light-emitting efficiency is relatively high. Different applications have different choices and requirements for secondary optics. "For example, wall washers will use reflectors more." Xiong Dazhang said that secondary optics also need to meet the designer's requirements and reach them. Like the effect. He believes that "no secondary optics must be the best, the right is the best."
Technical problems are solved, optical components are solved, and light effects are guaranteed. The next problem to be solved is reliability, stability and longevity.
Delip Product Director Pu Cheng
Nowadays, the requirements for LED lighting are getting higher and higher, and no stroboscopic is a word with high frequency. How to achieve no stroboscopic? Shenzhen Delipu product director Pu Cheng proposed that there are several solutions that can be solved: passive PFC+ valley filling circuit; two-stage scheme, active PFC correction + DC-DC constant current circuit; no PFC correction BUCK circuit; LED power supply DC end series de-ripple (no stroboscopic) dedicated IC; LED power supply DC end series linear constant current circuit. "At the same time, when doing foreign markets, we must pay special attention to the different voltage requirements of different countries' markets." Pu Cheng said.
Due to the imaginary space of the application of COB, there are many problems to be noticed in the application. “For example, the thickness of the thermal grease coating, the application of the snap kit, the inability of the light-emitting components to touch, etc.â€, in the case of Shi Chao, the engineering development manager of Hongli Optoelectronics, these details require R&D engineers and applications. Customers communicate more.
LED development all the way forward, from the initial functional requirements to the current pursuit of light quality and aesthetic design, not only the requirements of the light source, but the overall layout of the light source, secondary optics, drive power line.
From this point of view, the outbreak of COB has been on the line.
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