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When our smartphones or laptops are running out of power, if there is no charging system around, we will be distressed by 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 embedded photovoltaic polarizers on the liquid crystal displays (LCDs) of these products, which can convert large amounts of sunlight and background light into current. Many electronic products now use LCDs, including smart phones, TV screens, computer monitors, and notebooks, which has increased the feasibility of this research.
The technology works primarily through polarizers, and by installing two polarizers to ensure 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 additional light sources, 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 LCD is constructed by placing liquid crystals in two parallel glasses. There are many small vertical and horizontal wires in the middle of the glass. By controlling whether the electricity is turned on or not, the rod crystal molecules can change direction and refract light to produce images.
It is also learned that the current research results have been published in the online version of "Advanced Materials" magazine. Yang Yang, a professor of materials science at the University of California Los Angeles School of Engineering and the project leader, said: “I believe that this invention will change the rules of the game because it can improve the energy efficiency of LCDs. In addition, by using indoor and outdoor light, These polarizers can also be used as ordinary solar cells. So 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 is simple to apply and it is expected to be applied in large scale in the future."
Yusuli Bertos, project director of the Intel Labs Academic Research Office, said: “The new device is able to absorb 75% of the backlight and convert it into a power source. We have worked closely with UCLA to create efficient batteries and high-efficiency energy. More likely. This creation is very interesting, and we can also use it for other projects."
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