Fully understand the LED light source problem of LED lighting

The most critical parts of an LED lighting product are heat dissipation, drive power, and light source. At the same time, heat dissipation is particularly important. The heat dissipation effect directly affects the life quality of lighting products, and the life of the drive power itself. And the stability of the output current and voltage also has a great impact on the overall life quality of the product. The light source is the core part of the entire product. Next, the LED light source will be analyzed and explained.

For LED light sources to enter the field of lighting, the performance is only the premise, and the cost is the real determinant. In the early stage of the development of semiconductor lighting, it is necessary to focus on the pursuit of performance; in the development of semiconductor lighting to a certain stage, we should turn our attention to how to significantly reduce costs while ensuring performance. Because what we want to do is not only the artworks appreciated by the petty bourgeoisie, but also commodities acceptable to the general public. The level of the finished product determines the level of penetration of the LED as a light source into the lighting field.

There are generally the following ways to reduce the cost of commodities:

Material cost reduction-It is the most direct and effective to press the supplier's material price, reduce the material grade or select alternative materials on the original product plan, but the scope is limited, and there are certain quality risks;

Technology cost reduction-adopt a new technology route, change the original product program, reduce the use of materials and manufacturing links, the scope is objective; efficiency cost reduction-depends on the progress of technology, equipment and management.

To reduce the cost of LED light sources, the above approaches must be considered, but the first consideration is how to respond to the characteristics of semiconductor lighting, break the constraints of traditional packaging concepts, and reduce the packaging cost of LEDs with new technical solutions.

For traditional lighting, the "light source + lamp" mode is generally adopted, and the manufacture of the light source is relatively independent of the lamp. Because the LED light source has the characteristics of small size, strong light and easy control, etc., it can generally make flexible changes and choices according to the requirements of the lighting effect in the application. For semiconductor lighting, there is no obvious boundary between the manufacture of LED light sources and lamps. The cost reduction of LED light sources should be considered as a whole with the requirements of the lighting system. Therefore, the packaging scheme of the LED light source should be made according to the requirements of the driving circuit, thermal management, optical design and structural design of the lighting system. The purpose is to develop a new LED light source packaging form, which greatly reduces the packaging while ensuring the overall performance. And application costs.

1. Chip integrated COB light source module personalized packaging may become the mainstream packaging form of semiconductor lighting in the future

LEDs are available in discrete and integrated packages. LED discrete devices are traditional packages and are widely used in various related fields. After more than 40 years of development, a series of mainstream product forms have been formed. The chip integrated COB module is currently a personalized package, which is mainly designed and produced for some individual application products, and has not yet formed a mainstream product form.

The traditional LED lamp practice is: LED discrete source device → MCPCB light source module → LED lamp, mainly because there is no suitable core light source component, and the method is not only time-consuming, but also costly. In fact, we can combine the "LED light source discrete device → MCPCB light source module" into one, directly integrate the LED chip on the MCPCB (or other substrate) to make a COB light source module, and go to "COB light source module → LED lamp" The route not only saves labor and time, but also saves the cost of device packaging.

Compared with discrete LED devices, COB light source modules can save LED primary packaging costs, light engine module manufacturing costs and secondary light distribution costs in lighting applications. In the lighting system of the same function, the actual calculation can reduce the cost of the light source by about 30%, which is of great significance for the application and promotion of semiconductor lighting. In terms of performance, through reasonable design and micro-lens molding, the COB light source module can effectively avoid the disadvantages of spot light and glare in the combination of discrete light source devices; it can also reduce the light source efficiency and significantly by adding an appropriate red chip combination Under the premise of longevity, it can effectively improve the color rendering of the light source (at present it can achieve more than 90). In terms of application, the COB light source module can make the installation and production of the lighting fixture factory more simple and convenient, and effectively reduce the application cost. In production, the existing process technology and equipment can fully support the mass production of high-yield COB light source modules. With the expansion of the LED lighting market, the demand for lamps is growing rapidly. We can form a series of mainstream products of COB light source modules according to the needs of different lamp applications for large-scale production.

2. Miniaturized SMD LED will also be another major product of LED light source

In addition to the integrated chip COB light source module may become the mainstream packaging form of semiconductor lighting in the future, high-performance, low-cost, convenient for mass production and installation and application of miniaturized SMD LED will also be another LED light source Mainstream products. Personally, the main manifestations of semiconductor lighting in the future are:

Flat lighting-office premises or backlighting;

Strip lighting-decorative lighting;

Lamp lighting-replace traditional lighting.

In flat lighting products, the application of chip-integrated COB light source modules and chip-type LEDs will coexist; in strip lighting products, chip-type LEDs will lead the way; in lamp lighting products, chip-integrated COB light source modules Application will become mainstream.

In short, the LED light source toward lighting will form two mainstream forms-functionalized chip integrated COB light source module and miniaturized LED devices. Low cost will be the eternal theme. Who can take the lead in breaking the constraints of traditional packaging and develop LED light sources that meet the needs of semiconductor lighting, who can take the lead in the product; who can maximize the cost under the premise of ensuring performance, who can grasp the future LED light source Market.

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