Cree Inc. is currently recognized as a global leader and innovator in the LED lighting industry. Headquartered in Durham, North Carolina, USA, Cree Inc. is a global LED epitaxial, chip, package, LED lighting solution. A well-known manufacturer and industry leader in compound semiconductor materials, power devices and RF. It has a production base in Guangdong Province, China.
LED (Light Emitting Diode) is called the fourth generation illumination source or green light source. It has the characteristics of energy saving, environmental protection, long life and small size. It can be widely used in various indications, displays, decorations, backlights, general lighting and urban night scenes. And other fields. Under the background of global energy conservation and environmental protection, LED as a new type of green light source product is recognized as an important development trend in the future. For example, at the 2008 Beijing Olympics, the Water Cube used 496,000 Clarion LED lighting products for external lighting, while the Bird's Nest also used 258,000 energy-saving semiconductor energy-saving lamps.
It can be said that we have entered the era of LED lighting. LED lamps have a long service life and can last for decades, and consume only a fraction of the energy required for incandescent and fluorescent lamps. Although LED technology has existed for about 40 years, it has not been used in the past few years by manufacturers like Cree to apply it to lighting technology on a large scale to improve the quality of light. Cree is leading a revolution in replacing low-efficiency lighting with efficient, energy-efficient lighting technologies.
Cree's LED lighting range has now surpassed 150 lumens. "This is not the limit," said Ed Hutchins, ongoing engineering manager at Cree Materials. “This means our LED lights are brighter,†says Hutchins. “Reducing the use of LEDs in lighting can reduce costs. Of course our customers – the manufacturers of lighting equipment – ​​are aware of these LEDs. the benefits of.
The Hutchins team is responsible for the development of silicon carbide wafer substrates, which are the basis for all Cree products. His engineers have used JMP for data analysis, process control, experimental design, Six Sigma projects, and more for many years. "Data mining and data visualization are two very broad aspects of our use of JMP," Hutchins said.
The power of visualization
Hutchins's team cut a silicon carbide crystal into wafers, then polished and cleaned the surfaces of the wafers, making them smooth and flawless, preparing for the next epitaxial growth, so that the device was designed according to its function. Operation. The light of an LED lamp is produced by an epitaxial layer, and the quality and color of the light are determined by the quality, structure and composition of the layers. The consistently high quality wafers delivered by the Hutchins team are key to the final manufacture of high quality finished products. However, when a downstream customer detects a defect that has a significant impact on production, the defect needs to be traced.
“The first application of JMP was to visually study the frequency of defects discovered by downstream customers,†said Hutchins, which connects to a database that stores downstream customer information, retrieves the data, and uses JMP to analyze and generate deficiencies. Control chart for daily trends. "This is a good example of using JMP for visual analysis," Hutchins said. "There is a false signal and a real signal. The false signal indicates how fast the failure rate escalates. It is initially zero. Then jumped 20% to 30% in just a few days. But this is only a conclusion that has nothing to do with the facts." In fact, this is only because the review has been strengthened and the defects have appeared more frequently. It was therefore decided to analyze the data at a given time and under consistent conditions.
Hutchins and his team wrote a JMP script to query the data, including processing dates and times, batch processes, analyzing data and production process conditions. "If we collect the dataset ourselves by writing a piece of data access code," Hutchins said, "it takes a few hours to run. And doing this in JMP is much faster."
Team members then use JMP to build a model that includes only the most important factors. “The factors considered in the model are the steps of the process,†Hutchins explained. “And the value of each factor is also very important.†At this point, by comparing them to see their effects, and based on engineering judgment And JMP's predictive scribes, which focus on which step the survey should focus on, and then narrowed down to two potential steps. They were surprised to find that although the two tools were used for steps that were far apart in the process schedule and were physically separated on the factory's production line, there was an interaction between them. "With JMP's visual analysis tools, interactions can be seen very clearly in the model, and our primary consideration may be this interaction," Hutchins added. This interaction is the root of the problem, and a repair action plan starts immediately.
Choosing the real benefits of using JMP, Hutchins said, "It's not about finding the answer to the question, but about guiding you in the right direction, so you know where to find the problem. I can understand the difference between these tools, and these are the I didn't understand it before. By knowing where to find the problem and focusing on it, we can get the defect rate back to zero."
Visualization combined with statistical analysis
“I like JMP because it is so powerful in visual data analysis,†Hutchins said. “It allows you to generate various types of control charts, graphs and display results to help you understand the data. The most important thing is to get the right data; the second important thing is to know what the data tells you. To understand it, you The data must be linked together to see and understand. If there is only one data table, it can't be done. There are some other software that can generate charts and other results, but they don't have the statistical functions that JMP has. So if I want to Finding a significant statistical difference in these distributions, or trying to run a full-factor test and understanding the effects of all of these factors, I can't do it with other software; but it works in JMP. JMP visualizes excellent data and The combination of powerful statistical analysis capabilities makes it the best choice for us. It is widely used in our company."
In the days to come, we will need JMP for analysis. Demand for LEDs is erupting, and more and more cities, universities, businesses and consumers are deploying energy-efficient LED lighting. For example, the city of Anchorage, Alaska, has begun to use Cree's lighting to retrofit all street lights. Los Angeles has also promised to make the same changes in the next few years. “Imagine the LED street lights in the entire city of Los Angeles,†Hutchins said. “How spectacular this will be. There is no doubt that our success is due to our ability to innovate and improve,†Hutchins said. “With JMP, our innovation and improvement capabilities will be greatly enhanced.â€
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