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LCD (Liquid Crystal Display) LCD. The LCD is constructed by placing a liquid crystal cell between two parallel glass substrates, a TFT (thin film transistor) on the lower substrate glass, and a color filter on the upper substrate glass to control the liquid crystal molecules through the signal and voltage change on the TFT. The direction of rotation is achieved so as to achieve the purpose of controlling whether the polarized light of each pixel is emitted or not. Now that LCD has replaced the CRT as the mainstream, the price has dropped a lot and it has been fully popularized.
working principle
We have known for a long time that there are three types of solid, liquid, and gaseous materials. Although the arrangement of the centroids of liquid molecules does not have any regularity, if these molecules are elongated (or flat), their molecular orientation may be regular. So we can subdivide the liquid into many types. The liquid with no regular molecular orientation is called liquid directly, and the liquid with molecular orientation is called "liquid crystal", or "liquid crystal" for short. In fact, LCD products are not unfamiliar to us. The mobile phones and calculators we commonly find are LCD products. The liquid crystal was discovered in 1888 by Austrian botanist Reinitzer, an organic compound with a regular molecular arrangement between solid and liquid. The most commonly used liquid crystal type is a nematic liquid crystal, and its molecular shape is an elongated rod shape with a length and width of about 1 nm to 10 nm. Under the action of different current electric fields, the liquid crystal molecules will be regularly rotated by 90 degrees to produce a light transmittance. The difference is that the difference between light and dark is generated when the power is turned on/off. According to this principle, each pixel is controlled and a desired image can be formed.
advantage
1. Because the CRT display is controlled by the electromagnetic field generated by the deflection coil to control the electron beam, and because the electron beam can not be absolutely positioned on the screen, the CRT display often has different degrees of geometric distortion, linear distortion. The LCD will not suffer any geometric distortion or linear distortion due to its principle problem, which is also a great advantage.
2. Compared with the traditional CRT, the liquid crystal also performs well in environmental protection. This is because there is no high-voltage component like the CRT inside the LCD, so it will not cause the x-ray emission exceeding the high voltage, so its radiation index It is generally lower than CRT.
3. The biggest advantage of LCD compared with traditional CRT is power consumption and volume. For traditional 17-inch CRT, its power consumption is almost 80W or more, and most of the power consumption of 17-inch LCD is about 40W. In this way, liquid crystal can be described as an obvious advantage in energy saving.
working principle
We have known for a long time that there are three types of solid, liquid, and gaseous materials. Although the arrangement of the centroids of liquid molecules does not have any regularity, if these molecules are elongated (or flat), their molecular orientation may be regular. So we can subdivide the liquid into many types. The liquid with no regular molecular orientation is called liquid directly, and the liquid with molecular orientation is called "liquid crystal", or "liquid crystal" for short. In fact, LCD products are not unfamiliar to us. The mobile phones and calculators we commonly find are LCD products. The liquid crystal was discovered in 1888 by Austrian botanist Reinitzer, an organic compound with a regular molecular arrangement between solid and liquid. The most commonly used liquid crystal type is a nematic liquid crystal, and its molecular shape is an elongated rod shape with a length and width of about 1 nm to 10 nm. Under the action of different current electric fields, the liquid crystal molecules will be regularly rotated by 90 degrees to produce a light transmittance. The difference is that the difference between light and dark is generated when the power is turned on/off. According to this principle, each pixel is controlled and a desired image can be formed.
advantage
1. Because the CRT display is controlled by the electromagnetic field generated by the deflection coil to control the electron beam, and because the electron beam can not be absolutely positioned on the screen, the CRT display often has different degrees of geometric distortion, linear distortion. The LCD will not suffer any geometric distortion or linear distortion due to its principle problem, which is also a great advantage.
2. Compared with the traditional CRT, the liquid crystal also performs well in environmental protection. This is because there is no high-voltage component like the CRT inside the LCD, so it will not cause the x-ray emission exceeding the high voltage, so its radiation index It is generally lower than CRT.
3. The biggest advantage of LCD compared with traditional CRT is power consumption and volume. For traditional 17-inch CRT, its power consumption is almost 80W or more, and most of the power consumption of 17-inch LCD is about 40W. In this way, liquid crystal can be described as an obvious advantage in energy saving.
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