With the popularity of flip-chip LED light sources in the market, more and more people know about flip-chip light sources, but many people still don't know what the so-called flip-up is all about. Don't worry, listen to me and give you a slow path. Come.
Positive LED chip structure Because the p, n electrodes are on the same side of the LED, current crowding is easy to occur, and the thermal resistance is high, and the flip-chip structure can solve these two problems well, and can achieve high current density and uniformity. degree. In addition to the cost of materials, the stability of the lamp and the light efficiency are particularly important in the future. The flip-chip structure can well meet such needs. This is also the field of LED applications where the flip-chip structure can take all kinds of power, and the dressing technology is generally applied to small and medium power LEDs. Flip-chip technology can also be subdivided into two categories, one is flip-chip based on sapphire chip, the sapphire substrate is reserved for heat dissipation, but the current density is not obvious; the other type of flip-chip structure strips the substrate material. Can greatly increase the current density.
The reason why flip chip is called "flip-chip" is relative to the traditional gold wire bonding method. Conventionally, the chip electrode connected to the substrate by gold wire bonding faces upward, and the electrode surface of the flip chip faces downward, which is equivalent to turning the former over, so it is called "flip chip".
As the maturity of LED products is getting higher and higher, the technology is becoming more and more difficult. The flip-chip LED technology has been gradually sought after by the industry in recent years. Because of its good gold-free heat dissipation, but the cost is high, COB has become the best stepping stone to the market.
Nowadays, flip-chip COB has gradually entered the production line of major packaging companies. It is an inevitable trend that the industry will frequently sing up and replace the formal dress, but why is it still dominated by formal wear? Can flipping really replace it and see what the makers say?
Flip the COB to replace the formal dress is the general trend for the narrow marketAt present, the flip-chip is not much better than the formal dress, the price is almost the same, and the market recognition is not enough. Moreover, the secondary optics of the flip-chip is still not well-fitted, and the brightness is 10-12% lower than that of the formal wear. Although the same side photoelectric can currently achieve less than 8%, it still faces these problems.
Regarding the current lack of brightness of the flip chip, Huang Wenping, the director of the same party photoelectric technology, said that at the same price, the flip chip size is going down, so the brightness is reduced. But the same size, the flip-chip brightness is too high, after all, it has less light absorption on the front. In short, the current price/performance ratio of flip-chip COB does not have much advantage. For the time being, it is only a narrow market. However, flipping is a trend, and it will definitely replace the formal dress, and it will definitely be brighter than the formal dress, because it is simplified in both process and structure.
Zheng Haibin, deputy general manager and marketing director of Jiangxi Zhaochi Optoelectronics Co., Ltd. also said that some COB products are relatively mature and the cost is relatively low. The flip-chip COB fully utilizes the chip to withstand higher current and no gold wire production as material cost optimization, production management cost. Lowering the conditions provided, flipping COB is only a matter of time for market validation.
In this regard, Hongli Optoelectronics general manager Lei Lining believes that the current market for such products is still staring at both ends, one is a low-priced product that does not require high light efficiency. The other end is a high-end product in the dedicated field, such as limited space for luminaire design, but requires high power and high luminous flux output, special requirements for reliability and high power output of small illuminating surface, etc. It has its own unique field.
In this regard, Xia Xuesong, general manager of silicon energy lighting, also said that in the medium and long term, it is an inevitable trend that the market for flip-chips has an absolute large share. In this regard, Zou Yiming, general manager of Shenzhen Xinyueguang also said that with the light effect of flip chip, the price is continuously optimized and upgraded, and the market space in the future is huge.
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