What is the full form of CRT
CRT: Cathode Ray Tube
CRT stands for Cathode Ray Tube. It is a vacuum tube containing one or more electron guns and a phosphorescent screen, which is used in traditional computer's display and in Television. It works by moving electrons from the back of the tube towards the display screen where it collides with the phosphorous. When the electrons hit the phosphorous, they light up and are projected on the screen.
The colour shown on the screen is produced by three lights Red, Green and Blue and often referred to as RGB.
When a speaker or other magnetic devices are kept close to a CRT monitor, interference is produced.
This is due to the Magnetic charges which guides the way of electrons. LCDs and flat screens don't face this problem as they don't use magnetic charges. Tube is also absent, due to which they look much thinner than CRT monitors. LCD display is almost matchable with the quality of CRT monitors which is why they are replacing them from both consumer as well as professional market.
- Physical size: CRT has a larger size and a heavy weight.
- Contrast: They have much better contrast ratio and give more visible details in dark images. While they lack to give brighter white levels in LCD display.
- Cost: CRT is getting vanished from market. Most manufacturers have stopped the production of CRT. It is quite inexpensive and is very difficult to find in the market.
- User Friendliness: CRT uses 4:3 ratio display screen. You must have seen in traditional televisions, a black bar on top and bottom of the screen. It means that it is not able to use all the screen space. Whereas, LCD screens are much wider which means they have either a small bar or no bars at all.
Basic Components of CRT
- Electron Gun: It generates the beam of electrons.
- Anodes: They accelerate the electrons.
- Horizontal and Vertical Deflection Plates: These plates produce the low frequency electromagnetic field required to adjust the direction of beam of electrons.
- Fluorescent Screen: It is made up of phosphor. It emits light when the electrons strike on it.
- Evacuated Glass Envelope: It assembles or holds the whole cathode ray tube.
Applications of CRT
- It is used in cathode ray oscilloscope
- It is used as a display device in radar
- It is used in televisions and monitors