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COB will become the mainstream? The yesterday, today and tomorrow of the White LED packaging industry< br>today, yesterday, past, present, tomorrow, tcob, cob, mcob, t8, t5, t10, t12, led, tubes, bulbs, lamps, fluorescent, lights, lighting, replacement, retrofit, white, technology, reviews, introduction: In the past decade, with the development of white LED packaging technology and markets evolve gradually, the international mainstream LED devices experienced the ceramic package, represented by high-power (high-brightness) HB-LED (1W, 350mA Standard drive current) to the support structure to PLCC represented in power (mid-power) MPLED (0.2-0.8W, 60-260mA drive current) of the center of gravity shifted. This trend is mainly driven original< br>????Over the past decade, with the development of white LED packaging technology and markets evolve gradually, the international mainstream LED devices experienced the ceramic package, represented by high-power (high-brightness) HB-LED (1W, 350mA drive current standard ) to the support structure to PLCC represented in power (mid-power) MPLED (0.2-0.8W, 60-260mA drive current) of the center of gravity shifted. The main reason driving this trend briefly summarized in the following points:< br>????First, with the power of maturity and industrialization, large-scale effects and optimization technology targeted at the application of the performance of the TV backlight power LED chips in the rapid increases in the cost of the package to improve the breakthrough, making it both light efficiency (lm W) or price (lm $) are superior to the ceramic high-power package. In the trend of LED to the general lighting market penetration, the power package to fully tap the energy-efficient LED light source, and a step closer to the price of traditional light sources, the market will soon be recognized and accepted.< br>????The second, from the application point of view, in the past few years, LED lighting is mainly used in replacement lamps, particularly in the A-Lamp Bulb T8 tubes and the fastest growing, the biggest increase in the market. From the power supply configuration, the cooling structure, and optical effect, the medium-power LED bulb is more suitable than the high-power ceramic lamps and LED, and the cost of power to enable it to be used in a large number of the bulb. If you use the high-power lamp T8 tube or flat spot is the most difficult problem to overcome, and the use of more stars is not only small and medium-power LED light-efficient, but also effectively prevent the emergence of spot problems.< br>????Rising power package, forcing the ceramic high power gradually by high wattage lamps and directional application requirements to find a way out. Currently ceramic high power in a small emitting angle MR spotlights, downlights part, high-bay lamps have an advantage. Because of its good thermal performance and high reliability in harsh environments, high-power ceramic packages still occupy the major market for outdoor lighting applications, including street lights, tunnel lights.< br>????However, with import and other EMC and SMC thermoset material PLCC holder, with its over traditional thermoplastic PPA or PCT on the high temperature resistance, yellowing performance has greatly improved, PLCC package also gradually from the stent the previous low-power to high-power expansion. 1W-1.5W currently uses EMC bracket LED has been widely used and the reliability can be verified in the market.< br>????At the same time, another gradually COB package in the compact light emitting surface, high-density applications in the applications and demonstrate its advantages. COB is a multi-chip array package is fixed in the form of a metal or ceramic substrate, eliminating the need for single LED package directly to the blue-chip solid crystal is then coated with phosphor, it can be more flexibility to choose various power or the size of the chip, intensive series and parallel to the substrate, then solder wire or connector will drive power is introduced.< br>????COB penetration MR16, PARReflector and other commercial lighting applications rapidly, with better spatial light pattern and color uniformity. With the flip chip maturity, flexibility, no gold design brings, as well as to enhance heat dissipation substrate material and the reflectivity of the dozens of stars or even hundreds of pieces of blue LED integrated on the same substrate has become possible. Thus further Super-highPower (SP-LED) COB package. COB high optical density can be expected and will replace metal halide high-wattage lighting applications in a place.
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