Liquid crystal materials are found in1888; 1968, the first LCD product was made in the United States; Liquid crystal is a substance between solid and liquid, and it is an organic compound with regular molecular arrangement. If heated, it will appear as a transparent liquid, and when cooled, it will appear as a turbid solid of crystal particles. It is precisely because of this characteristic that it is called liquid crystal. The molecular structure of liquid crystal used in liquid crystal display is similar to that of thin matchsticks, and the liquid crystal display made of this liquid crystal is also called LCD. In LCD TV, a voltage is applied to the liquid crystal between two pieces of glass, and the picture is reproduced through the changes of molecular arrangement and twists and turns. The screen creates a picture through the collision of electron groups, and forms a picture through the perspective reflection of external light. Because the traditional display uses CRT, the electron beam must be emitted to the screen through the electron gun, so the neck of the CRT cannot be made very short, and the volume of the whole display will inevitably increase when the screen increases. Liquid crystal display controls the state of liquid crystal molecules through electrodes on the display screen to achieve the purpose of display. Even if the screen is enlarged, its volume will not increase directly, which is much lighter than the traditional display with the same display area. The weight of LCD TV is about 1/3 of that of traditional TV. The color of LCD TV is16.7 million, and the picture is clear and the color is gorgeous and true.