What is Cathode Ray Tube (CRT) - How It Work's Ultimate Guide

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What is Cathode Ray Tube



What is Cathode Ray Tube (CRT)?


Before understanding the cathode ray tube technology, it is very important to understand what CRT is, in fact, the cathode ray tube is a special type of vacuum tube in which the image is generated by striking the electron beam on the aphorosat (the non-light surface). Most desktop computer and monitor screens use CRT, CRT in computer screen is the same as picture tube in TV.

Friends, you have come to know what is Cathode Ray Tube (CRT). Now further you will know about its components.

 

Components of Cathode Ray Tube?


A cathode ray tube has many important components, such as an electron gun, anode, coil etc. The electron guns act as an insulator of electros, and increase the speed of the anode electrons, generating a depleting electrical current in the cathode ray tube.

 

What is a CRT monitor?

What is CRT Monitor: In the early days of computers only monitors based on CRT technology were used. These monitors made of glass picture tube were heavy and used a lot of electricity. 

It actually consists of a glass vacuum tube and electron beams are released through the electron gun assembly. The surface of this tube with which the beams collide is coated with phosphorus. The rays emanating from the gun are of three colors - this color is RGB

Here R means Red, G means Green and B means Blue. All the colors we see on the monitor are all a combination or combination of red, green and blue colors. 


CRT technology has been improved over time and where curv picture tubes were being used earlier, now flat picture tubes Experimentation has started. In these, the view is more clear than the curve.
 

Invention of cathode ray tube


The cathode ray tube was invented in 1897 by Ferdinand Braun, named "Braun tube," which was the first CRT to use a code-cathode diode with a screen coated with phosphorus. John B. Johnson and Harry Weiner Weinhart created the first cathode ray tube using hot cathode and this is it. 


Used as a commercial product in 1922. The first CRT television was built in 1934 by the German company Telefunken. By this time, coffee had improved in CRT technology and they were also being used in computer monitors.

In the early computer era, analog signals were used for displays. But now due to the change in technology, digital signal is used. 


This technique is also called DVI interface. In the early stages of computers, analog signal was used for the display. But now due to the change in technology, digital signal is used. This technique is also called DVI interface.


how CRT Monitor works?


The antenna on your roof catches the radio waves (waves) generated by the transmitter. If you use a satellite umbrella on your wall or ceiling, these signals come to your satellite TV. If you have cable TV, then with the help of underground fiber-optic cable, these signals would come to your cable TV.    

The incoming radio signals are collected in the antenna socket on the back of your TV. 

The electron gun on the TV divides the circuit video part into three types of signals - red, blue and green, allowing the three electron gun to operate.      

These three electron beam go down into the cathode ray tube. 

Electro-magnets move the electron beam in such a way that the beam travels from one line to another on the screen, moving back and forth. 

This audio circuit, it ejects the sound from the loudspeaker in such a way that its timing matches perfectly with the screen movie. 

 

CRT Digital Analog Monitor


It is a traditional color display screen, which has been used in television for many years. In fact, all monitors based on CRT technology are analog. 


Some monitors are called digital monitors because they receive digital signals from video adapters. EGA monitors, for example, must be digital, as the EGA standard specifies the digital signal. 

However, before the image is displayed to digital monitors, it is necessary to convert the signal into analog form.

Some monitors can accept both digital and analog signals. Some analog monitors are also called digital. 


Because they resort to digital control to adjust the display. Many analog monitors are multifrequency monitors, which means that these monitors can accept signals of two or more preset frequency levels.

 

What is dot pitch in monitor


A term called dot pitch is used to refer to monitors made with CRT technology. This affects the display quality of the monitor. Let's understand it. The CRT monitor has a special plate on which the shadow mask is made. 


This plate is followed by a layer of chemical called phosphorus. There are several thousand holes in this layer. With these holes, the focus of each beam of the electron gun is correct. 

The dot pitch technique prevents the wrong dots being thrown by the electron gun from appearing. The distance between two dot pitches is in millimeters.

Because of this, the space between them remains the same and it produces a good quality display. 


When the company named IBM created the first color monitor, the distance between dot pitches was .43 millimeters. Which is said to be very poor. In fact, the lower the dot pitch value, the better we will see the image. 

Nowadays .25 millimeter dot pitch is used. Also the monitors have switches available to determine the brightness and contrast from which we can correct the image to a great extent.

 

CRT monitor resolution


Everything we see on the monitor consists of pixels or dots. The higher the number of pixels in an inch, the higher the resolution of the monitor. 


This number of pixels depends on the memory in the video adapter card. If you want 1280 x 1024 or more pixels in one inch, then you will also have to take a 21 inch monitor. You can set a resolution lower than that for 15-inch and 17-inch monitors.
 

CRT monitor refresh rate


Technically, refresh rate can also be called vertical scan frequency. Because of this, we see another image after an image disappears on the screen. 


It is measured in Hertz. Currently, monitors with a 72 Hz refresh rate are in practice. This monitor can show us 72 photos one after another on the screen. 

If the monitor's refresh rate is low then you will have a lot of discomfort while working. So while buying a monitor, keep in mind that the refresh rate should be maximum.


What is Cathode Ray Tube (CRT) - How It Work's Ultimate Guide


CRT monitor radiation


You must have heard about the monitor that it is a low radiation monitor. The electromagnetic field is actually emitted by the monitor and is harmful to our health. 


Scientists have used VLF technology in monitors to prevent this emission. This means very low frequency. This will produce a very small amount of radiation. 

Nowadays, monitors with ELF technology have also come into vogue. They produce a very small amount of electro-magnetic radiation.

 

CRT monitor related precautions


Set your computer to DPMS when the monitor is not to be used for a long time. If using a screen saver, set the computer to active screen mode. Never use a damaged or loose plug.

There is a possibility of electric shock or fire. Never pull the plug from its wire and never touch the plug with wet hands. 


There is a possibility of electric shock or fire. Always use properly grounded plugs and other utensils only. Improper inadequate ground is likely to cause an electric shock or may cause damage to the equipment. 

Tighten the power plug in the outlet in such a way that there is no loosening there.

There is a possibility of fire due to incorrect connection. Do not bend the plug and wire too much, nor place any heavy material on it. 


This can make them worse. Due to this there is a possibility of electric shock or fire. There is a possibility of electrical shock or fire due to dirty connector. 

Remove the monitor's mains wire (power cord) from the plug before cleaning the monitor.

 

Difference between CRT and LCD


CRT and LCD are the types of Display Device where CRT is used as a traditional Display Device while LCD is the more recent technology. 


These are mainly constructed from construction and function mechanisms, however, both of which perform the same function of providing a visual form of electronic media. 

Here, the important operational difference is that CRT integrates the two processes light generation and light modulation and is also managed by a single set of components. 

In contrast, LCD separates the two processes from each other which is light generation and modulation.

The primary component used in the CRT is the vacuum tube while in the LCD it is a liquid crystal. 


The LCD uses the shutter effect On the other hand, CRT employs beam penetration and shadow masking methods.

 

The main difference between CRT and LCD

➤Because of the popularity of LCDs the cost of CRT is low, the use of CRT was greatly reduced whereas LCD can be purchased at a higher price than CRT. 
The CRT consumes more power than an LCD. 
The device used in CRT to create images is electron beam. In contrast, LCD is a major component in the creation of liquid crystal images. 
The CRT provides a good response rate of less than 1 microsecond while the LCD provides a high response rate of 1-8 milliseconds. 
LCD's resolution and image retention are higher relative to CRT. 
LCDs are available in compact sizes. In contrast, CRT is larger in size and has wider space.

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