The principle of LCD screen optical rotation, the display principle of LCD?

Just imagine, for a TN-type LCD screen, the upper and lower polarizers.

It is placed perpendicular to each other, when there is no voltage, the liquid crystal molecule is distorted by 90 °, all the light enters the liquid crystal from the lower polarizer, the polarization state changes by 90 °, which just matches the polarizer, so when the voltage is not added, the screen is bright, this kind of screen is mostly used in notebook computers, the reason is very simple, notebooks are generally white background, black is the information pattern;

For the VA-type LCD screen, when the voltage is not added, the liquid crystal molecules are not distorted, so after the light enters the liquid crystal from the lower polarizer, the polarization state does not change, and it is still perpendicular to the upper polarizer, so the light cannot pass through the upper polarizer, so the VA screen is black when the voltage is not added, but if the voltage is added at both ends of the liquid crystal, the arrangement of the liquid crystal will change, and the light can be transmitted at this time. Is that understandable?

For TN LCD screen, the upper and lower polarizers are placed perpendicular to each other, when there is no voltage, the liquid crystal molecules are distorted by 90 °, and all the light enters the liquid crystal from the lower polarizer, the polarization state changes by 90 °, which is just matched with the polarizer, so when the voltage is not added, the screen is bright, this kind of screen is mostly used in notebook computers, the reason is very simple, notebooks are generally white background, black is the information pattern;

For the VA-type LCD screen, when the voltage is not added, the liquid crystal molecules are not distorted, so after the light enters the liquid crystal from the lower polarizer, the polarization state does not change, and it is still perpendicular to the upper polarizer, so the light cannot pass through the upper polarizer, so the VA screen is black when the voltage is not added, but if the voltage is added at both ends of the liquid crystal, the arrangement of the liquid crystal will change, and the light can be transmitted at this time.

Introduction to the internal structure and principle of LCD monitor,It is the basis for learning LCD TV,It is recommended to take a look。

From the perspective of the structure of the liquid crystal display, whether it is a laptop or a desktop system, the LCD display used is a hierarchical structure composed of different parts. The LCD consists of two glass plates, about 1 mm thick, separated by 5 m evenly spaced containing liquid crystal (LC) material. Because the liquid crystal material itself does not emit light, there are lamps as light sources on both sides of the display, and there is a backlight plate (or homogenizing plate) and reflective film on the back of the liquid crystal display, the backlight plate is composed of fluorescent substances that can emit light, and its role is mainly to provide a uniform background light source.

The light emitted by the backlight panel passes through the first polarization filter layer and enters the liquid crystal layer containing thousands of crystal droplets. The crystal droplets in the liquid crystal layer are all contained in a tiny cell structure, one or more cells that make up a pixel on the screen. Between the glass plate and the liquid crystal material is a transparent electrode, the electrode is divided into rows and columns, at the intersection of the row and column, by changing the voltage and changing the optical rotation state of the liquid crystal, the liquid crystal material acts like a small light valve.

Around the liquid crystal material are the control circuit part and the drive circuit part. When an electric field is generated by the electrodes in the LCD, the liquid crystal molecules are distorted, so that the light rays passing through it are regularly refracted and then displayed on the screen through a second filter layer.

The working principle of liquid crystal display is as follows: under the action of electric field, the arrangement direction of liquid crystal molecules is used to change the transmittance of the external light source (modulation), and the electric light conversion is completed, and then the different excitations of R, G and B primary color signals are used to complete the color reproduction in the time domain and space domain through the red, green and blue primary color filter films.

The LCD display is characterized by a thin body, space-saving, compared with the bulky CRT display, the LCD only needs one-third of the former's space; It is a low-power consumption product, and it can be completely free of heat compared to CRT displays; No radiation, which is conducive to physical health, and the LCD display is completely radiation-free; The picture is soft and does not hurt the eyes.

Look at some ** I can't post it.

The working principle of the liquid crystal display is to put the liquid crystal screen in the middle of two pieces of glass that can conduct electricity, so that the electric field reaction occurs between the two electrodes, and the liquid crystal molecules are distorted to produce electromagnetic effects, so as to control the effect of light source projection and shading, and the light and dark phenomenon is generated through the control button of the power supply, so that the display screen can show the effect of the image, if we install a color filter, the image will be displayed in color.

When we want to install two pieces of glass on the alignment film, then the liquid crystal will be aligned according to the direction of the groove, because the groove of the alignment film of the glass substrate is too high to 90 degrees, so the liquid crystal molecules will form a torsion form, if the electric field is not installed on the glass substrate, the liquid crystal molecules will undergo a transformation of the alignment, and the light will maintain its original direction due to the gap of the liquid crystal molecules, which is blocked by the polarizer below, and the light will be absorbed and impossible to transmit. The LCD panel will turn black, and the LCD monitor is based on whether there is a voltage or not, so that the panel can achieve the effect of display.

How does an LCD monitor work? Scientists will take you to reveal how LCD monitors work!

Learn how LCD monitors work.

The working principle of liquid crystal (LCD-liquidcrystaldisplay) display is:

1.Under the action of the electric field, the arrangement direction of the liquid crystal molecules is changed to change the transmittance of the external light source (modulation), and the electric-light conversion is completed, and then the different excitations of the R, G, and B primary color signals are used. 2.

Through the red, green and blue primary color filter films, the color reproduction of the time and space domains is completed. Unlike the CRT color picture tube, it uses digital addressing and digital signal excitation to reproduce the image.

The basic principle of an optical instrument used to determine the concentration of a chiral molecular solution is to use the optical rotation of chiral molecules.