LCD liquid crystal display is widely used

by:Genyu     2019-11-28
The liquid crystal display is a flat ultra-thin display device, which consists of a certain number of color or black and white pixels and is placed in front of the light source or reflecting surface. The power consumption of liquid crystal displays is very low, so they are favored by engineers and are suitable for electronic equipment using batteries. Its main principle is to use current to stimulate liquid crystal molecules to generate points, lines and surfaces to form a picture with back lamps. The working principle of Liquid Crystal Display: Liquid crystal is a special substance between solid and liquid. It is an organic compound that is normally liquid, however, its molecular arrangement is as regular as that of solid crystals, so it is named liquid crystal. Another special property of it is that if an electric field is applied to the liquid crystal, its molecular arrangement will be changed, if you give it a polarized light, it has the effect of preventing light from passing through ( Light can pass smoothly without applying an electric field) If you match the color filter and change the voltage applied to the liquid crystal, you can change the amount of light transmitted by a certain color, it can also be said that changing the voltage across the liquid crystal can change its transparency (But in practice this must be matched with the polarizer). However, on the other hand, the digital interface of LCD is not popular and is far from being applied. Theoretically speaking, liquid crystal display is a pure digital device, and the connection with the computer host should also adopt a digital interface. The advantage of adopting a digital interface is self-evident. Firstly, the signal loss and interference in the analog-to-digital conversion process can be reduced; Reduce the corresponding conversion circuits and components; Secondly, there is no need to adjust the clock frequency and vector. Most of the interfaces of liquid crystal displays in the market are analog interfaces, which have problems such as easy interference of transmission signals, need to add analog-to-digital conversion circuits inside the displays, and inability to upgrade to digital interfaces. Moreover, in order to avoid the occurrence of pixel flicker, the clock frequency, vector and analog signal must be completely consistent. In addition, the digital interface of liquid crystal display has not yet formed a unified standard, and display cards with digital output are rare in the market. As a result, the key advantages of liquid crystal displays are difficult to give full play. This problem may not be well understood. Let's give an example to illustrate it. People who have used liquid crystal displays know that liquid crystal displays are prone to image tailing. Response time is a special indicator of LCD. The response time of the liquid crystal display refers to the response speed of each pixel point of the display to the input signal. If the response time is short, the phenomenon of image tailing will not occur when the moving picture is displayed. This is very important when playing games and watching fast moving images. The response time is fast enough to ensure the coherence of the picture. The response time of ordinary liquid crystal displays on the market has made a great breakthrough compared with the past, generally about 40 ms. However, with the development of technology, the gap between LCD and CRT is gradually being made up, and the response time of a liquid crystal display has been shortened to 5 ms.
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