LED technology has a variety of directions. Xiaobian today summarizes six new LED technologies and applications, including visible light that can transmit data in the dark. The initial process of plant blue light response is ascertained, and the color is increased by a factor of two. Color LED, first-class standard size 7070 high-power LED, fiber-optic drawing tower with UV LED light curing system.
1. Visible light that can transmit data in the dark
Researchers at Dartmouth College in the United States have given Visible Light Communication (VLC) a new feature by encoding the transmitted data into an ultrashort-frequency pulse that is invisible to the human eye but can be detected via a photodiode. This allows visible light to transmit data in dim or dark environments.
The researchers' idea is to make full use of visible light, even when the indoor lights are often turned off during the day. In addition, mobile users who rely on visible light know how much power is being transmitted from the source to the receiver. As a result, researchers have designed a novel data encoding and LED driving mechanism using off-the-shelf low-cost LEDs and photodiodes. Researchers face various challenges in the process. For example, they must design an effective driver circuit that achieves the lowest latency with fast response speed (only a few nanoseconds) and increases the gain of low-cost photodiodes (improved Communication distance).
In addition, there is an optimized lightweight modulation scheme that encodes the maximum number of bits possible during the duty cycle of ultra-low-power LEDs. At the same time, researchers have developed a robust demodulation scheme that is reliable. The ground picks up bits from the light pulse.
The researchers called this invisible VLC program 'DarkLight', which achieves a data rate of 1.6kbps, supports communication distances of up to 1.8m, and significantly reduces LED front-end power consumption from 19.8W to 104mW. . Moreover, the researchers used a 500ns light pulse and only 0.007% of the LED duty cycle, making the DarkLight LED almost no different from the "off" state of the LED.
The researchers pointed out that DarkLight extends the application of VLC because it is just a special mode in which VLC links may switch seamlessly. This mode allows the light-based communication path to always be turned on regardless of the actual brightness of the light. Interestingly, DarkLight also adjusts its LED duty cycle to ambient light, allowing it to operate at maximum cycles while maintaining unobtrusive brightness.
The researchers also looked at how the receiver simultaneously decodes bits from the light pulses emitted by multiple LEDs, and differentiates multiple synchronized bitstreams in different LEDs based on the time slot combination that each LED uses to encode the data. . Next, the researchers hope to increase the data rate and range of DarkLight and further explore higher-order LEDs and photodiodes to find the ultimate limit of DarkLight. Researchers have even considered more advanced drive circuit designs, such as pulse shaping, that can be used to produce shorter but higher light pulses. In addition, this new VLC coding mechanism is also applicable to IR, which reduces the IR energy for the safety of the human eye, and this is one of the research directions for researchers in the future.
2. The initial process of plant blue light reaction was identified
On October 21st, an international joint research group consisting of the Japan Institute of Physical Chemistry, the University of California, Los Angeles, and the South Korean University of South Korea announced that the initial process of plant blue light response was identified. It is said that the blue light receptor "cryptory pigment" present in the nucleus of plant cells is activated by "dimerization" after receiving blue light, and BIC1 protein hinders dimerization and regulates the activity of cryptochrome. For plants, light is not only an energy source for photosynthesis, but also a source of information for detecting the surrounding light environment, so that multiple photoreceptors continue to evolve. Among them, cryptochrome is an important photoreceptor that controls many blue light responses of plants, such as de-yellowing (the yellowing of cotyledons and plants that become bean sprouts), flower bud formation, and vaginal response ( Extend the stem, grow to a better light environment, etc.)
There are two kinds of cryptochromes, CRY1 and CRY2, which control the expression of various genes after being activated by blue light. However, the molecular mechanism by which blue light causes cryptochrome activation has not been ascertained. In addition, the mechanism of desensitization (the original reaction disappears under continuous light stimulation) is the same. Previously, only CRY2 was decomposed rapidly after activation, but the mechanism of desensitization common to CRY1 and CRY2 has not been ascertained. In this study, Arabidopsis thaliana full-length cDNA overexpression system "Thaliana FOX Line" was used to screen for variants with low blue light response. As a result, a "BIC1 (Blue light Inhibitor of Cryptochrome1) gene" which inhibits cryptochrome signaling was found. When BIC1 binds to cryptochrome, it completely blocks the cryptochrome phosphorylation and the cytochrome-controlled multiple gene expression control and other reactions related to cryptochrome signaling.
In addition, CRY2 will "dimerize" after receiving blue light. After phosphorylation, dimerized CRY2 binds to the signaling factors SPA1 and CIB1, controls the expression of multiple genes, and induces morphological changes (blue light response) corresponding to blue light. BIC1 hinders the formation of dimerization of CRY2. These results indicate that the formation of dimerization depending on blue light is an important process for the initial reaction of cryptochromes, and BIC1 inhibits the dimerization of cryptochrome pigments and then inhibits the phosphorylation of cryptochrome pigments. Reaction. The cryptochrome controls the importance of various crops, so this research is expected to contribute to the increase in biomass of crops in the future.
3, the color is improved by 2 times the high color LED
Citizen Electronics Co., Ltd. announced on October 20 that it has developed the second-generation CITILED Vivid series of high-color LED products for lighting LEDs, which has doubled the color of the first generation. They will be on October 27 The "2016 Hong Kong International Lighting Fair", which began at the beginning of the day, will be on display and is expected to be mass-produced in the spring of 2017.
With regard to the second generation of new products and the introduction of two series that pursue color, customers can choose according to their own purposes and needs.
CITILED Vivid Series Brilliant Type is more suitable for spotlights such as display areas, CITILED Vivid series Natural Type is more suitable for space lighting.
For the bright colors, the store lighting, the art gallery, and the studio are the first, and with the improvement of the chroma, the contrast between the light and the dark can be improved. Therefore, educational institutions such as libraries and schools are also very suitable. In the future, as a pioneer of COB LED, we will create new value for light.
The CITILED Vivid series Brilliant Type light has improved chroma, and the color of the object can be more vivid and beautiful. The Vivid series is compared with general LED lighting, and the chroma of all the colors is increased by C*ab*2, which makes the object appear more vivid than the original color. With regard to the Brilliant type developed this time, according to the adjustment of the ratio of the phosphor material, when the balance of the whole is maintained, the original red and green with low chroma are improved, so that the vividness is doubled. It can show meticulous beauty and is most suitable for spotlighting in store displays and art galleries.
CITILED Vivid series Natural Type, while maintaining the current Vivid series ⊿C*ab value (chroma), not only highlights the brightness of the subject, but also adjusts the balance of chroma, making the sensory natural product.
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