How the monitor works

The system unit is necessary for storing and processing information. The monitor allows you to visualize all the work, receive information about its progress and results. It is also used to enter data and control processes occurring in the system unit.

Main parts inside the monitor

Today there are several display options. And, although CRT screens have almost become a thing of the past, they can still be found in some places. Compact LCD panels have replaced bulky monitors. How are they structurally different?

CRT - screens

The main part of this screen is a kinescope, called a cathode ray tube. It is made of a glass tube with a vacuum inside. The screen is the flat and wide part of this tube. The narrow part is the neck. The back of the device is coated with a special substance, phosphor. It also has an electron gun.

This gun releases electrons that pass through a grid made of metal. The back surface of the display is covered with phosphor dots of several colors. Passing through the detaching system, the rays hit it behind the back of the kinescope.

Liquid crystal panels

Despite the fact that liquid crystal technology was learned back in the 19th century, it began to be used only in the second half of the 20th century.It was these monitors that displaced CRT screens from the electrical appliances market.

The most important element here is the matrix. It consists of:

• Halogen-filled backlight;
• Reflective system and LEDs. They are necessary so that the illumination is uniform;
• All contacts are placed on a glass substrate. There are two substrates here, one is located in front of the matrix, the second is behind;
• The liquid crystals themselves;
• Polarizers;

How does a monitor work?

Since the design of monitors is different, the image formation is carried out through different actions.

CRT - screen. A special gun responds to the formation of the image. Using an electromagnetic field, it releases a dense stream of charged particles. They pass through a metal grill and end up on the back of the kinescope. Charged particles fall on the phosphor, which begins to glow.

LCD display. The operating principle is based on a property of a light beam called polarization. In its normal state, light is not polarized. This can be achieved using special substances that can transmit a beam of light in one plane. They are called polarizers. There are two such polarizers in the matrix and they are installed opposite each other. When one of them rotates, the polarization axis changes. This is how the screen brightness is adjusted.

The matrix is ​​a kind of sandwich, the main parts of which are two glass panels, between which there are crystals. There are recesses on the surface of the panels; they regulate the movement of the crystals. The image is formed by electrodes that create an electromagnetic field. And to make it visible, the matrix is ​​illuminated using diodes.

REFERENCE! Forming an image is a rather difficult process from a technical point of view, and each type of screen has its own process. Technologies do not stand still and devices are constantly being modernized, including the principle of image formation.