The working principle of lcd screen is to make use of the physical characteristics of liquid crystal to turn on when it is powered on, so that the liquid crystal arrangement becomes orderly and light can easily pass through;When there is no electricity, the arrangement becomes chaotic, preventing light from passing through. The following is about the characteristics of lcd:A very common display now. It has the advantages of small size, light weight, power saving, low radiation and easy to carry. The principle of liquid crystal display (LCD)It is very different from cathode ray tube display (CRT). LCD is a display device based on electro-optic effect of liquid crystal. A character segment display device including a segment display mode;Character, graphic and image display devices in matrix display mode; Matrix display mode of large screen LCD projection TV LCD screen, etc.