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Liquid crystals, called liquid crystals, are related to their physical properties: their molecular crystals, but liquid rather than solid. Most liquid crystals belong to organic complexes. The characteristics of liquid crystal molecular makes it has two very useful features: if you let the current through the liquid crystal layer, these molecules will be arranged in the direction of current flow, if there is no current, they will be parallel to each other. If you provide the outer layer with fine grooves, will pour into liquid crystal, liquid crystal molecules will be arranged along the groove, and the inner layer and the outer layer are arranged in liquid crystal third characters in the same way it is amazing: the liquid crystal layer can make the light twist. The liquid crystal layer acts somewhat like a polarizer, which means that it can filter out all the light except from the special direction. In addition, if the liquid crystal layer is reversed, the light will reverse and shoot in different directions from the other.
These characteristics of liquid crystals enable it to be used as a switch that can block light or allow light to pass through. The bottom layer of the liquid crystal unit is made up of tiny ridges that allow molecules to be arranged in parallel. So it is on the surface, the molecules in this between the two sides are arranged in parallel, but when a certain angle between the two upper and lower surface, the surface with liquid crystal into two different directions of the arrangement, will be distorted. As a result, this twisted spiral layer distorts the passing rays. If the current passes through the liquid crystal, all molecules will be arranged in accordance with the direction of the current, which will eliminate the twisting of the light. If a polarization filter is placed on the upper surface of the liquid crystal layer, the twisting light passes through, and no twisting light will be obstructed. Therefore, the arrangement of the liquid crystal in the LCD can be changed by switching the current, so that the light is ejected when the power is added, and is not interrupted when the power is added. There are also some design requirements for electricity saving. When there is an electric current, the light can not pass, and when there is no current, the light passes.
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