CRT monitors

Before the advent of LCD technology, personal computers were equipped with CRT monitors. They are distinguished by their large dimensions and large mass.

IMPORTANT. Using CRT monitors is not energy efficient. In particular, the electricity consumption of such displays is comparable to high-power incandescent lamps.

The quality of the resulting image is characterized by high clarity. Therefore, this type of monitor is in demand for the graphic design of raster images.

CRT monitors - what are they?

A CRT monitor is equipped with a glass vacuum tube. The inner part of this element facing the user is coated from the inside with a special composition - Luminofor. This special coating emits light when bombarded with electrons. The composition of this layer in color CRT devices includes complex elements based on rare earth metals. The brightness and period of glow created by the phosphor depends on the percentage and properties of the components used.

Principle of operation

The formation of a picture on such a display occurs using an electron beam gun. ABOUTIt emits a stream of electrons that pass through a specialized metal mask and are directed to the inside of the glass surface of the display.

The flow of charged electric particles on the way to the front surface of the screen is converted in an intensity modulator, which accelerates the system. The operation is based on the principle of potential difference.Due to the passage through the modulator, charged particles receive a lot of energy, which is spent on illuminating the pixels. Electrons enter the luminofor, then the energy of the electrons contributes to the glow of certain areas of the screen. Activation of pixels ensures the formation of a picture.

REFERENCE. Conventional CRT color monitors use the RGB color palette.

The housing contains three electronic emitters. They generate one of 3 basic shades and transmit a beam of electric particles to certain areas of the phosphor layer. The intensity of the glow of each tone from the palette is different. This parameter is varied in such a way that by increasing the power of each of the three beams to the maximum, white light will be formed. By combining all three basic tones at a minimum level, a gray or black pixel will be obtained. A mask is a design element that ensures precise illumination of the required area of ​​the screen with an electron beam. The design features of the mask are determined by the type of kinescope and the brand. The quality of this element affects the clarity of the picture (rasterization).