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In the past two years, the growth rate of the LED lighting industry has continued to slow down, smashing the bubble brought by the extensive growth of the past few years. Many domestic LED manufacturers actively adjust their growth methods from technology, products or business models, and seek new transformation paths. The use of LED visible light to realize wireless communication (LiFi) has become a "magic weapon" for the transformation of many manufacturers.
LIFI (LightFidelity), a branch of visible light communication technology, by implanting a chip in an LED lamp, the LED light turns into a wireless hotspot, an alternative "WiFi". With its ultra-high speed, secure communication, and precise positioning, it is favored by LED lighting companies and communication companies, and has a broad market prospect.
It is understood that mainstream LED manufacturers including Qinshang Optoelectronics, Sanan Optoelectronics, Feile Audio, etc. have already carried out related research and development on LIFI technology. However, as of now, no one has achieved mass production, and most of them are still in the stage of trial, evaluation or small-scale trial production.
At the moment, LIFI is in its infancy in China. Due to the immature technology and the lack of a complete industrial chain, there are still uncertainties in the market and cost. Therefore, most LED manufacturers are in a close watch on the LIFI project.
The market potential is huge, and the application prospects are expected
"In the future, as long as there is light there will be a signal", this is the most popular understanding of LiFi, but also the imagination of the future world. Nakamura Shuji has boldly predicted: "The next killer application in the LED industry is visible light communication (LiFi). In the future, the home lighting will become the information transmission device that will open the last road because it can carry communication signals."
The news of several research and development breakthroughs has made LiFi technology seem to be a step closer, attracting investors and brokers. On November 13, 2015, certified by the Ministry of Industry and Information Technology, China's "Key Technology Research of Visible Light Communication System" achieved a major breakthrough, and the real-time communication rate was increased to 50 Gbps, which is equivalent to downloading a high-definition movie in only 0.2 seconds. On November 26th, British media reported that an Estonian experiment proved that the test result under the ideal conditions of the laboratory is that the maximum transmission speed can reach 224G per second.
At present, LED bulbs developed based on visible light communication technology have grown into intelligent lighting devices with multiple meanings and uses such as lighting, communication, and cross-border applications, and have ushered in a good opportunity for development. LiFi will expand the next-generation broadband communication spectrum, seize the blank spectrum, effectively use resources, deepen the connection with lighting and display industries, and increase communication advantages. In addition, LiFi will have a range of applications in the Internet of Things, health and other fields.
Zhang Tao, researcher and researcher at the Shanghai Institute of Technical Physics, Chinese Academy of Sciences, said that LiFi has a promising future. First, LiFi can achieve data fusion. The advent of the "big data" era has brought unprecedented pressure on communication "bandwidth", while visible light communication, which is 10,000 times higher than the bandwidth of wireless spectrum, can bring higher bandwidth. Second, LiFi can illuminate the dead corner of communication, realize the call on the plane, access the Internet, use the mobile phone in the hospital equipment area or mine, and smoothly talk in the tunnel and subway. Third, LiFi can expand the Internet of Things industry, causing a series of changes in smart home systems, museum exhibits explaining systems, indoor positioning systems, wearable devices, display screens for mobile phones to send information, advertising push, and mobile payments.
The subversion of LiFi in high-speed Internet has driven the optimism of the visible light communication industry. Some brokers expect that the global visible light communication market will reach $6 billion in 2018. After 2020, the market space for visible light communication technology will be more than 15 billion US dollars.
Today, visible light communication has become a must for international communications research in the United States, Japan and Europe. The Scottish startup PureLiFi, founded by Professor Harald Haas, hopes to use the light bulb to establish an Internet connection and has received £1.5 million ($2.2 million) in financing, valued at £14 million.
Scottish wireless optical communications manufacturer pureLiFi cooperated with French LED lighting supplier Lucibel to produce LED LiFi luminaires to further promote the commercialization of LiFi. The product applies pureLiFi technology to Lucibel's LED lighting fixtures to reduce the cost of integrating communications and lighting services into a single infrastructure, while improving security, positioning and overall performance of wireless communication systems, is expected to be available in the third quarter of this year. .
A number of leading companies compete for layout
With the development of smart cities, LEDs in the future will not only be limited to “lightingâ€, but also not only stay in the production and sales of lamps, but also have higher application value. "Intelligence" is an inevitable trend, and "visible light communication technology (VLC)" will become a key part of smart lighting. Based on this, domestic leading enterprises such as Qinshang Optoelectronics, Sanan Optoelectronics and Feile Audio are competing to deploy the visible light communication market.
As the first LED listed company in the industry to get involved in LiFi optical communication, the LiFi project of Qinshang Optoelectronics has become an important step in its competitive strategy of developing smart lighting and connecting smart cities. To this end, Qinshang Optoelectronics has been in the layout for a long time. As early as May 2013, it signed a cooperation agreement with Tsinghua University in the field of visible light communication and positioning. In the second year, it signed an LED wireless optical communication project with the Chinese Academy of Sciences, and subsequently officially launched the LiFi engineering prototype. The 2014 annual report shows that its two subsidiaries are involved in the visible light communication business.
At the same time, Sanan Optoelectronics disclosed in the 2015 semi-annual report that the company signed a Strategic Cooperation Agreement with Shanghai Aerospace Electronic Communication Equipment Research Institute on July 11, 2015, and the two parties jointly developed and promoted indoor and outdoor LED intelligent lighting communication ( LiFi) products, etc., the strategic cooperation period is 10 years.
In addition, Leng Ping, deputy general manager of Feile Beijing Base, revealed that Fei Le has already had a layout in visible light communication, and has already joined the team of Professor Song Jian from Tsinghua University and Nan Rui Zhixin in the Beijing Municipal Science and Technology Commission Brand Operation Center and Changping District. Demonstration projects were built in the underground garage of the UHV building of the power grid. “Fei Le has set up a team to develop visible light communicationâ€.
Because LiFi's main applications focus on control, communication, and positioning, communication and lighting are combined to provide lighting and secure, reliable broadband data access at lower power consumption and lower cost. Therefore, in addition to LED lighting companies, there are communication companies in the LIFI industry chain. It is understood that large communication companies such as ZTE and Huawei have been working on this technology. In June last year, Huace Optical Communications launched the first indoor precision positioning APP in China. The indoor positioning accuracy reached 1 meter and was trial run in Changzhou Luqiao Small Commodity Market.
Industrialization has a long way to go
At this stage, visible light communication is one of the hot technical fields in which economic powers such as Europe, the United States, Japan and South Korea compete for investment and research and development. As of the end of November 2015, there have been more than 4,400 published patent applications related to visible light communication technology, and they are increasing year by year. Domestic research on optical communication technology has come to the forefront. Today, the number of related patent applications in China is the first in the world, reaching more than 1,700.
In sharp contrast to the burst of patent applications, the industrialization process of visible light communication, especially LiFi technology, is very slow. At present, it is still in the laboratory stage. It is the laboratory samples, demonstrations, and mass-produced products. Did not appear.
It is understood that the application of visible light communication is divided into low speed and high speed, and the low speed transmission rate is several tens of Kbps to several Mbps, and the maximum is not more than 10 Mbps. Low-speed visible light communication technology has been applied. For example, the front car can use LED lights to transmit distance signals to the rear car; LED street lights can help the car to locate. The high-speed mode of visible light communication has not yet reached the "critical point of research and development to application conversion", only some experimental applications, is also the focus of current industry research.
Dr. Xu Ran, a researcher of Zhigu Ruituo, who has been studying visible light communication for a long time, said that at present, the industrialization of visible light communication is still in its infancy. From a technical point of view, the current downlink transmission rate can already exceed WiFi, but compared with WiFi, there is a lack of effective support for mobility, non-line-of-sight transmission and uplink high-speed data transmission, and it is necessary to solve the technical problem of bandwidth and signal uplink and downlink.
Some professionals said: "The chips of visible light communication products are specially designed. There is still no company in China that has become one of the constraints of LiFi industrialization. At the same time, there is no unified technical standard for the LIFI industry at this stage. Forming alliances, formulating specific industry standards, and leading the giant enterprises, it is possible to industrialize."
In the process of industrialization, the problem does not stop there. "The experimental circuit is far from the real commercial. The transmitting and receiving equipment for processing signals is as big and bulky as the box. It has no practical value." A person involved in the industrialization of visible light said that the experimental equipment should be miniaturized. Mature, and finally industrialized.
Many domestic experts engaged in visible light communication told reporters that if they do not consider funds, this technology will take 3-5 years to precipitate before it can be erupted and even popularized. There is no industrial linkage, and the bottleneck of LiFi technology itself, wants to be large-scale. Industrialization is still far away.
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