CRT stands for cathode ray tube. CRT it is an elevated glass tube. An electron gun at one side of the tube produces a beam of electrons which is directed towards the front of the tube or towards the screen. The inner side of the screen is coated with Phosphorus substance which gives off the light when it stopped by electrons.
- Standard CRT:
In standard CRT the electron gun emits electron beams which fall on the phosphor coating due to which a glow occurs which display the text or a picture. afterglow the light gets filled for continuous viewing the image is therefore refreshed at regular intervals so frequently that the changing image appears as a continuous picture to the human eyes.
- Beam penetration CRT:
A normal CRT with phosphor coating generate images of only one colour a colour CRT for line drawing displays images on multilayer phosphor. Colours are achieved by controlling the beam accelerating potential. The screen is coated with a layer of green phosphor over which area of red phosphor is deposited.
When a low potential electron beam strikes the screen only the red phosphorus gets excited thus producing a red trace. A higher velocity beam will penetrate into the green phosphor increasing the green components of the light output by varying the beam potential different combinations of Red and Green lights can be produced.
- Shadow mask CRT:
The majority of colour television sets and computer monitors used Shadow mask colour CRT which has phosphor coated screen behind the screen there is a metal plate with small holes arranged in a specific pattern. It uses three electron guns for red green and blue components of the light output.
The guns are arranged in a triangular fashion the deflection system operates on the three electron beam simultaneously bringing them to the same point of focus on the shadow mask all the three beans pass through a single Hole in the Shadow mask and strikes the phosphor at the described point.
Figure – Colour CRT Shadow mask techniques
Attention reader! Don’t stop learning now. Get hold of all the important CS Theory concepts for SDE interviews with the CS Theory Course at a student-friendly price and become industry ready.
- Difference between Input and Output devices
- Peripherals Devices in Computer Organization
- DDA Line generation Algorithm in Computer Graphics
- Point Clipping Algorithm in Computer Graphics
- 2D Transformation in Computer Graphics | Set 1 (Scaling of Objects)
- Translation of objects in computer graphics
- Segments in Computer Graphics
- Computer Graphics | Cathode ray tube (video display device)
- Computer Graphics | Antialiasing
- Draw a moving car using computer graphics programming in C
- Computer Graphics | The RGB color model
- Applications of Computer Graphics
- Window to Viewport Transformation in Computer Graphics with Implementation
- Display Processor in Computer Graphics
- Introduction to Computer Graphics
- Difference between Parallel and Perspective Projection in Computer Graphics
- Interactive Graphical Techniques in Computer Graphics
- Painter's Algorithm in Computer Graphics
- Methods for Text Clipping in Computer Graphics
- Interpolation Methods in Computer Graphics
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.