What is the surface layer of a computer LCD screen?

The substance in the LCD screen is a polymer crystal that can flow. Solid-state crystals in general are directional, so many of their physical properties are also directional. Liquid crystals have the fluidity of liquids while having the directionality of general crystals.

Unlike a solid crystal, the entire crystal must be rotated if you want to change the direction of a solid crystal, which can be controlled by an electric or magnetic field. Both STN and TFT use a material called "nematic" liquid crystal, which is filamentous, and it is commonly used in applications to control the direction of the "filamentous" liquid crystal using an electric field. Components made of liquid crystals usually encapsulate the liquid crystals in two sheets of glass.

A substance called alignment agent is coated on the surface of glass, and the arrangement of liquid crystals in the absence of an external electric field can be controlled by the type and treatment method. The refractive index of the liquid crystal changes with the direction of the liquid crystal by using an electric field, and the polarity of the light changes after passing through the TN-type liquid crystal. As long as the appropriate thickness is selected so that the polarity of the light is changed by exactly 90°, two parallel polarizers can be used to prevent the light from passing through at all.

A sufficiently large voltage can make the direction of the liquid crystal parallel to the direction of the electric field, so that the polarity of the light does not change, and the light can pass through the second polarizer. As a result, you can control the brightness and darkness of the light. As mentioned earlier, the display principle of STN-type liquid crystal is the same as that of TN-type liquid crystal, except that it rotates the incident light by 180 270 degrees instead of 90 degrees.

In addition, a pure TN-type LCD display itself has only two variations: light and dark. STN liquid crystals, on the other hand, are mainly pale green and orange. However, if a color filter is added to the traditional monochrome STN liquid crystal display, and each pixel in the monochrome display matrix is divided into three sub-pixels, and the three primary colors of red, green, and blue are displayed through the color filter, the color can be displayed.

After the LCD screen is broken, the liquid crystal will flow out. However, if the shattering is not very severe, and there are only some fine lines, you may not see the liquid crystal outflow. In either case, even a fine-grained LCD will be scrapped.

It is a liquid crystal substance, with crystalline and amorphous characteristics, don't touch it, it will hurt the display, you can only use a special liquid crystal cleaner, and the monitor is far away from the subwoofer.

In 1888, Austrian scientists named Lenitzl synthesized a strange organic compound that had two melting points. When its solid crystals are heated to 145, they melt into a liquid, but they are cloudy, while all pure substances are transparent when they are melted. If it continues to be heated to 175, it seems to melt again, turning into a clear and transparent liquid.

Later, the German physicist Lehmann called the cloudy liquid in the "middle ground" a crystal. It is like a mule that is neither like a horse nor a donkey, so some people call it the mule of the organic world. Since the discovery of liquid crystals, people did not know what they were used for, and it was not until 1968 that people used it as a material for the electronics industry.

I worked hard to help you find a professional answer, so as not to mistake you.

Hehe! Inside are tens of millions of light-emitting diode transistors, the same principle as the three primary colors of light. It won't flow out!

Ask for a picture! Trouble, ** send it!