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Questions and Answers
What is a pixel in the context of a raster scan display technology?
What is a pixel in the context of a raster scan display technology?
- A collection of parallel lines forming an image
- A set of horizontal raster lines
- A dot or picture element of the raster (correct)
- A row of pixels on a display screen
Which type of device was the Direct View Storage Tube (DVST) from Tektronix?
Which type of device was the Direct View Storage Tube (DVST) from Tektronix?
- Refresh CRT
- Point-plotting device
- Raster scan device
- Line-drawing device (correct)
What is the limitation of raster scan display technology mentioned in the text?
What is the limitation of raster scan display technology mentioned in the text?
- High screen density
- Low cost
- Limited color capability (correct)
- Ability to draw complex images easily
What component of a Cathode Ray Tube (CRT) produces a narrow beam of high-velocity electrons?
What component of a Cathode Ray Tube (CRT) produces a narrow beam of high-velocity electrons?
How is the intensity of the electron beam controlled in a Cathode Ray Tube (CRT)?
How is the intensity of the electron beam controlled in a Cathode Ray Tube (CRT)?
What does a refresh buffer in a raster scan display technology control?
What does a refresh buffer in a raster scan display technology control?
In a CRT, what is used to control the intensity of the electron beam?
In a CRT, what is used to control the intensity of the electron beam?
What is the function of the focusing system in a Cathode Ray Tube (CRT)?
What is the function of the focusing system in a Cathode Ray Tube (CRT)?
Which part of a CRT allows passage of the electron beam?
Which part of a CRT allows passage of the electron beam?
What improvement did the Direct View Storage Tube (DVST) bring to display technology?
What improvement did the Direct View Storage Tube (DVST) bring to display technology?
What is the purpose of the phosphor screen in a CRT?
What is the purpose of the phosphor screen in a CRT?
How does an electron gun control the intensity of the electron beam in a Cathode Ray Tube (CRT)?
How does an electron gun control the intensity of the electron beam in a Cathode Ray Tube (CRT)?
What is the purpose of the deflection system in a Cathode Ray Tube (CRT)?
What is the purpose of the deflection system in a Cathode Ray Tube (CRT)?
What type of fields are used to deflect the electron beam in a CRT?
What type of fields are used to deflect the electron beam in a CRT?
What happens when a high negative voltage is applied to the control grid of a Cathode Ray Tube (CRT)?
What happens when a high negative voltage is applied to the control grid of a Cathode Ray Tube (CRT)?
How are the different color shades produced in a color CRT?
How are the different color shades produced in a color CRT?
What is the purpose of the focusing system in a CRT?
What is the purpose of the focusing system in a CRT?
How is the intensity of the electron beam controlled in a CRT?
How is the intensity of the electron beam controlled in a CRT?
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Study Notes
Raster Scan Display Technology
- A pixel is the smallest unit of a raster scan display technology, which can be turned on or off to create images on the screen.
Cathode Ray Tube (CRT)
- The Direct View Storage Tube (DVST) from Tektronix is a type of CRT device.
- The limitation of raster scan display technology is that it can display a fixed number of pixels, resulting in a limited resolution.
- The electron gun produces a narrow beam of high-velocity electrons in a CRT.
- The intensity of the electron beam is controlled by the electron gun, which regulates the number of electrons emitted.
- The intensity of the electron beam can also be controlled by applying a voltage to the control grid.
- A high negative voltage applied to the control grid reduces the number of electrons emitted, decreasing the beam's intensity.
- The focusing system in a CRT is used to focus the electron beam into a sharp point.
- The phosphor screen in a CRT converts the energy of the electron beam into visible light, creating images on the screen.
- The deflection system in a CRT is used to deflect the electron beam horizontally and vertically to create images on the screen.
- The deflection system uses electric or magnetic fields to deflect the electron beam.
Color CRT
- Different color shades are produced in a color CRT by using a combination of red, green, and blue phosphors, which emit light of different colors when excited by the electron beam.
Direct View Storage Tube (DVST)
- The DVST brought the improvement of being able to store and display images for a long time without fading.
Refresh Buffer
- A refresh buffer in a raster scan display technology controls the rate at which the image is refreshed on the screen.
Electron Gun
- The electron gun controls the intensity of the electron beam by regulating the number of electrons emitted.
CRT Components
- The electron beam passes through the aperture grille in a CRT.
- The intensity of the electron beam is controlled by the electron gun and the control grid in a CRT.
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