Wireless charging for mobile phones is no longer a "legend"

According to the US "Science Journal" report, when our smart phone or notebook computer is running out of power, if there is no charging system around, we will be worried about the shutdown of electronic products. Now, this distress is expected to be resolved. The University of California, Los Angeles (UCLA) School of Applied Sciences brings solutions.

UCLA engineers invented a new concept for charging electronic products by installing an embedded photovoltaic polarizer on the liquid crystal display (LCD) of these products, which can convert large amounts of sunlight and background lighting into current. Many electronic products now use LCDs, including smart phones, television screens, computer monitors, and notebooks, which has increased the feasibility of the study.

The technology works primarily through polarizers, and the installation of two polarizers ensures that only a certain amount of backlight passes through the device. The two polarizers are separated by a spacer of liquid crystal material. Since the liquid crystal material itself does not emit light, the technician equips the display with an extra light source, and the light guide plate and reflective film on the back of the LCD play this role. The light guide plate can convert a point light source or a line light source into a surface light source that is perpendicular to the display plane. The light from the backlight enters the liquid crystal layer after passing through the first polarisation filter layer. Around the liquid crystal material are the control circuit portion and the driver circuit portion. When the electrodes in the LCD generate an electric field, the liquid crystal molecules will be deformed, and then the light passing through them will be refracted regularly and then pass through the second filter layer and then on the screen. The team called this new type of energy harvesting polarizer polarized organic photovoltaics. The device can be used as a polarizer, a photovoltaic power generation device, and a photovoltaic panel in addition to the enhancement of the function of the liquid crystal display.

It is reported that from the perspective of energy efficiency, the existing LCD polarizer is not ideal. At present, 80% to 90% of an electronic device's energy is consumed by the backlight, and 75% of the light is lost due to the polarizer and has not been effectively used. The new polarized organic photovoltaic electronic display can regain most of the energy. The structure of the LCD is to place liquid crystals in two parallel glasses. There are many vertical and horizontal small wires between the two glasses. By energizing or not, the rod crystal molecules are controlled to change their direction and the light is refracted to produce images.

It is also learned that the current research results have been published in the online version of "Advanced Materials" magazine. “I believe that this invention will change the rules of the game because it can improve the energy efficiency of LCDs,” said Yang Yang, a professor of materials science at the University of California Los Angeles School of Engineering and a lead scientist in the project. In addition, by using indoor and outdoor light These polarizers can also be used as ordinary solar cells. Therefore, the next time you go to the beach, you can let the sun recharge your iPhone."

Yang Yang said: “In the near future, we are expected to further improve the energy efficiency of organic solar cells. In the end, we hope to integrate the technology with the products and realize commercial production. I hope that this new type of technology will become the mainstream of display technology in the future. "Rui Zhu, a postdoctoral researcher at the University of California, Los Angeles, said:" The technology has a simple coating method and is expected to be used in large scale in the future."

Yusori, Program Director, Intel Labs Academic Research Office Bertos said: "The new device can absorb 75% of the backlight and then convert it into a power supply. Our close cooperation with UCLA has created more possibilities for efficient batteries and high-efficiency energy. This creation is very interesting, and we also It can be used for Other projects."

According to foreign media reports, Japanese scientists have developed a new type of Wireless charger that successfully completed the demonstration of wireless charging. It is reported that this wireless Charger increases the wireless charging distance to 1 meter for the first time.

In the field of wireless charging, the wireless charging realized by Japanese scientists this time is not new. In fact, charging processes such as electric toothbrushes, electric razors, etc. have achieved zero contact with the charger. In the mobile wireless charging field, Palm is the leading company. The Palm Pre first applied wireless charging to the mobile phone. Unfortunately, the wireless charging distance is not yet unsatisfactory, and it only supports short-range wireless charging.

It is reported that a new type of wireless charging device developed by Japanese scientists consists of a transmitting coil and a receiving coil. The transmitter and receiver can detect each other and the charging does not need to be limited by the position. Japanese scientists say that the charging device can reach a high 95% charge efficiency when the transmission distance is 40 cm.

If long-distance wireless charging technology is widely used in mobile phone charging, the mobile phone will be more freely used. If you are a user envious of the Palm Pre wireless charging function, you can now expect that wireless charging will certainly be used in a large number of applications on mobile phones at some time in the near future.

The scientific basis of this technology is actually the well-known principle of electromagnetic induction, which can be traced back more than a century ago. In the 1930s, scientist Michael? Faraday first discovered the principle of electromagnetic induction - changes in the surrounding magnetic field will produce current in the wire. In the 1890s, an assistant to the Edison Spectral Radiative Energy Research Project and later scientist Nikolai? Nikola Tesla confirmed the possibility of transmitting radio waves wirelessly and applied for the first patent. Inductive charging has also been applied before, such as Philips launched a wireless toothbrush that can be wirelessly charged, and the Palm Pre recently - it requires a special charger, there are many coils inside, and it generates a magnetic field when energized - toothbrush There is also a receiver coil inside, which can receive the charge generated by the charger's internal magnetic field when placed near the charger and transfer the charge to the internal battery. But similar wireless chargers can only charge specific devices.

Amir Ben Shalom, chief technology officer and chief scientist at Powermat, said that quite a few electronic devices can be powered or charged in this way. "We used physical copper coils that Tesla had used many years ago, but we can control and monitor it and make it more efficient than before," he said. Place the phone on the surface of the mat and it can be identified by the internal radio chip, Poliakine said. The charging board can accurately determine the amount of power needed by the phone.

According to engadget, a company based in Penn State, USA, currently relying on this Powercast technology has signed cooperation agreements with over 100 major electronics companies, including some “relatively low” electronic power consumption. Products, such as mobile phones, MP3 players, automobile parts, temperature sensors, hearing aids, and even medical equipment manufacturers.

Basically the entire system contains two things, one is the sender plugged into the socket, and the other is the receiver (technical core) of the same size as the coin, as long as it is within a certain range (currently at 90 Within centimeters of the distance, the power supply can spontaneously transmit to the corresponding receiver.

The reason why this technology will be favored by such a number of manufacturers, because in his unique radio wave receiver can be adjusted according to the different load, electric field strength, while maintaining a stable DC voltage, which is also expressed in Airborne electromagnetic wave power can be minimized. (It is said that this stuff has been approved by the FCC)

The most amazing thing is that the cost of manufacturing this receiver is as little as five dollars. In addition, the notebook users who are often on the move are not in a hurry. When the power consumption of your laptop/UMPC is reduced to the single digit (the current limit), you will need to bring the charger when you go online. , But in the future, Internet fees may have to be tied with electricity bills.

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