CRT is a symbol for Cathode Ray Tube while the acronym LCD symbolizes Liquid Crystal Display. Both CRT display screen and LCD screen are kind of desktop or monitor which are used to display images or videos on their screens. CRT display and LCD both have many differences between each other. CRT displays have a cathode rays emitting tube inside of them that emit rays and when those rays strike with the fluorescent screen, it emits light and hence displays the pictures.
Comparison Chart between LCD and CRT monitors
|Abbreviations||LCD is a symbol for Liquid Crystal Displays.||CRT is a symbol for Cathode Ray Tubes.|
|Structure||LCDs have a crystal like liquid inside of it that directs the light to the screen from the bottom of the monitor.||CRTs have an electron gun at the end of the monitor tube. This electron gun emits electron beams that strikes the phosphors dots on the monitor screen.|
|Weights||LCDs have lesser weights as compared to CRT monitors. This is the reason that LCDs are preferred over CRT monitors.||CRT monitors are heavy-weighted.|
|Display Quality||LCD screens provide a better display quality. Images do not flicker on the screens of LCDs.||Display quality of CRT monitors is not as good as LCDs. Images sometimes flicker on CRT monitor screens and that is the reason of less good image quality.|
|Power usage:||LCDs use less electric power than CRT.||CRT requires more electric power for its working.|
|Core mechanism||The core task of forming image is done by the crystals.||Image is formed by striking of electron beam from the electron gun placed inside the CRT monitors.|
|Cost||LCDs are more costly as compared to CRT.||CRT monitors are less costly than LCDs.|
|Responsiveness||Response of LCDs is faster as compared to CRT monitors.||CRT monitors work slower on the other respect.
Complete definitions and explanation of both LCD and CRT is given below:
CRTs are the type of displays or monitors which have a cathode tubes at their back and a fluorescent screen. Screen contains tiny dots of three primary colors; Green, yellow and blue. All the other secondary colors are made by combining these primary colors. The proper mechanism of CRT is shown in the figure below:
Fig 1: Internal mechanism of CRT display
Structure of the CR Tube:
Complete mechanism of CRT Display is shown in the above figure. As one can look onto the figure that there is a cathode at the back of the tube. In front of the cathode there is an electron gun that emits electrons. Then a positively charged anode is present in front of the electron gun. Then there are horizontal and vertical plates called as X-plates and Y-plates respectively. Then at the very front of the tube, there exists a fluorescent screen upon which the beam of the electron strikes.
Working of CR Tube:
The electron gun emits electron beams. These electrons emitted from the electron gun are negatively charged while the anode following the electron gun is positively charged. Hence negatively charged particles are attracted towards the anode that is positively charged. That electron beam passes through the vertical and horizontal plates to strike the fluorescent screen. The fluorescent screen has phosphors dots on it of three different colors; red, green and blue. These are the primary colors while all the other secondary colors are made by combining these basic colors. When the electron beam emitted from the electron gun strikes the phosphors dots, these dots glow. That glowing of colors makes the picture to be visible on the monitor screen.
Cons of CRT monitors:
There are many cons of CRT monitors due to which it is not preferred over LCD screens. Usually CRTs are bulky, high weighted and have larger infrastructure as compared to LCDs which are not that much bulky. CRT screens do not give as much better display results as the LCD screens do. The images shown by the CRT monitors are not as sharp as the LCD screens are. These monitors consume more power to operate.
Liquid crystal displays, also known as LCD’s are a kind of hardware that are used in many electronic devices such as calculators, Apple iPad and computer monitors. LCD is a kind of display monitor that is thinner than CRT monitors. It has a crystal like looking liquid present inside of it. LCDs have less weight as compared to CRT monitors and they give a more appealing display of pictures/videos etc. This is the reason due to which LCDs are usually preferred over CRT monitors.
Structure and working of LCD
To understand the complete working of LCD, we need to look at its internal structure. The back lights are generated at the bottom of the computer monitor. Then at the above side, there exists an element with several layers. Because of that element and its several layers, the light is evenly spread over the whole LCD and it starts glowing. The secret however is the glass panel at the top of that element. That glass panel has two layers that are aligned perpendicular to each other. The light passes vertically through that panel. To display the colors/picture on the screen it is necessary to let the light pass vertically. Glass panel layers cannot align the direction of light. Therefore a crystal liquid is present between the two layers of glass panel. That liquid makes it sure to let the light pass only vertically when it reaches the screen. The liquid is provided the voltage/current for its working.
Just like CRT monitors, three kinds of colored glass panels are used in LCD. Those colors are red, green and blue. These are primary colors while the rest of all the colors are made by combining these three colors.
Fig 2: Internal working mechanism of LCD
Concluding the difference of the two types of screen, we can say that LCD screens perform better than CRT monitors for displaying images on screens. LCDs have many benefits over CRT. LCDs are lightly weighted and thinner and it is easy to move LCD monitors because of their less weight. On the other hand, CRT monitors are heavy and bulky. In older times, CRT monitors were used in television and some computer systems as well. LCDs are used in calculators, iPad and computer screens as well. LCDs consume less power as compared to that of CRTs. Response of LCDs is faster as compared to CRT monitors. CRT monitors work slower on the other respect. Internal mechanism of LCDs use a crystal liquid for its working. CRTs work with electrons that are emitted from an electron gun. Because of the better features of LCDs, they are more expensive. CRT monitors are more costly on the other hand.
People now-a-days prefer LCDs over CRT monitors because of the benefits it provides over CRT monitors. It is used in computer systems widely. CRT monitors are seen very less now-a-days anywhere because they have mostly been replaced by LCDs.