LCD liquid crystal display knowledge

Liquid crystal display, or LCD (Liquid Crystal Display), is a flat and ultra-thin display device, which consists of a certain number of color or black and white pixels, placed in front of a light source or reflector. Liquid crystal displays have very low power consumption, so they are highly favored by engineers and are suitable for electronic devices that use batteries. Its main principle is to stimulate the liquid crystal molecules to produce dots, lines, and surfaces with the back light tube to form a picture.

Classification of LCD liquid crystal display Advantages and disadvantages of LCD liquid crystal display

Although the product purchase and display principles are different, the common purpose of liquid crystal display (LCD) and traditional display (CRT) is to achieve excellent display effects. Now we compare CRT and TFT liquid crystal displays.

Structure and product volume: The traditional CRT display must emit electron beams to the screen through an electron gun, so the tube of the picture tube must not be too short. When the screen is enlarged, the volume must be enlarged. TFT is changed by the electronic board on the display. Molecular state, in order to achieve the purpose of display, even if the screen is enlarged, it only needs to increase the horizontal area, but the volume will not increase greatly, and it is much lighter than the CRT display. At the same time, TFT is only used for power consumption. Electric board and driver IC, so the power consumption is small.

Radiation and electromagnetic interference: The traditional display uses an electron gun to emit an electron beam to hit the screen to generate a radiation source. Although there are some advanced technologies that can minimize radiation, they still cannot be completely eradicated. TFT liquid crystal displays don't have to worry about this. As for electromagnetic interference, TFT liquid crystal displays have only a small amount of electromagnetic waves from the drive circuit. As long as the housing is tightly sealed, electromagnetic waves can be prevented from leaking. CRT displays have to make heat dissipation holes in the body for heat dissipation, so electromagnetic interference is bound to occur.

Screen flatness and resolution: TFT LCD used a pure flat glass plate from the beginning, so the flatness is much better than most CRT displays. Of course, there is now a pure flat CRT color display. In terms of resolution, TFT touch screen is far inferior to CRT monitors. Although in theory it can provide higher resolution, it is not the case.

Display effect: The traditional CRT monitor uses the electron gun to strike the phosphor, so the brightness of the display is much better than the transparent display of the liquid crystal. In the viewing angle, CRT is also better than TFT. In terms of display reflection speed, CRT and TFT are different Few.