PDLC (polymer dispersed liquid crystal) is a kind of polymer dispersed liquid crystal. As the name implies, dimming film is a kind of film that can adjust the light through the state. It mainly works between the scattering state and the transparent state. In other words, the film itself can change between transparent and non transparent state (the visual effect is close to frosted glass), and the transparency is regulated by voltage.
Functional characteristics and application fields of dimming film
Intelligent dimming film is widely used in modern building glass curtain wall, window glass, building internal partition, various vehicles and spacecraft side windows and other fields. In China, 2 billion m2 of new buildings and 40 billion m2 of existing buildings are built each year, and more than 80% of them are high energy consuming buildings. The exterior window and transparent glass curtain wall are the most active parts of heat conduction and heat diffusion and the most serious heat loss in the external enclosure structure.
The dimming film can be used as the sandwich or internal and external film of architectural glass. The solution of controlling the heat in and out through the window is realized by adjusting the light input and blocking the heat energy. It can automatically change color on demand, and no longer need to use indoor sunshade curtain or outdoor external sunshade grille for shading or heat insulation.
In the indoor space and outdoor light fusion connectivity, while controlling glare and heat, and effectively reduce energy consumption.
In order to achieve obvious energy-saving effect and improve visual comfort of dimming film, it depends on the accurate control system. Through the sensor and intermediate state controller connected with the intelligent dimming film, the light transmittance of the dimming film is adjusted according to the external light, which not only blocks the strong sunlight to reduce the refrigeration energy consumption, but also meets the requirements of visual comfort. At the same time, the sunlight is introduced as far as possible to reduce the lighting energy consumption, so as to achieve the optimization of energy efficiency and user experience.
In the past few years, the function of the first generation of commercialized intelligent dimming film is relatively single, which can only be controlled between on and off, and the cost is too high. Only when the production scale is expanded will the cost be greatly reduced.
At present, the value of intelligent dimming film products is not only reflected in reducing energy expenditure, but also in load management and user comfort, which is the key to attract early consumers.
The development direction of dimming film in the future is better performance and lower cost, which is embodied in the following aspects: the need for accurate controller, faster transmittance conversion speed, avoiding color in opaque state, wider dimming range and reducing production cost; designing more general and reliable lighting control algorithm to adapt to different users, different climatic conditions and different HVAC systems Develop product rating system and industry standards, develop design tools, etc.
If the product is flexible, its application range will be greatly expanded. It can not only deal with various shapes of surfaces, but also be integrated into wearable devices, such as color changing camouflage clothing.