CRT Components Quiz and Flashcards: Cathode Ray Tube Parts

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Questions and Answers

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?

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?

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?

Modulator Signup and view all the answers

How is the intensity of the electron beam controlled in a Cathode Ray Tube (CRT)?

By variation of the potential of the cylindrical control grid Signup and view all the answers

What does a refresh buffer in a raster scan display technology control?

Brightness of each pixel Signup and view all the answers

In a CRT, what is used to control the intensity of the electron beam?

Phosphor screen Signup and view all the answers

What is the function of the focusing system in a Cathode Ray Tube (CRT)?

To concentrate the electron beam to a small spot Signup and view all the answers

Which part of a CRT allows passage of the electron beam?

Control grid Signup and view all the answers

What improvement did the Direct View Storage Tube (DVST) bring to display technology?

Ability to draw complex images easily Signup and view all the answers

What is the purpose of the phosphor screen in a CRT?

To emit light when struck by the electron beam Signup and view all the answers

How does an electron gun control the intensity of the electron beam in a Cathode Ray Tube (CRT)?

By varying the negative potential at the control grid Signup and view all the answers

What is the purpose of the deflection system in a Cathode Ray Tube (CRT)?

To deflect/direct the electron beam horizontally and/or vertically to any point on the screen Signup and view all the answers

What type of fields are used to deflect the electron beam in a CRT?

Both magnetic and electrostatic fields Signup and view all the answers

What happens when a high negative voltage is applied to the control grid of a Cathode Ray Tube (CRT)?

Electron passage is stopped Signup and view all the answers

How are the different color shades produced in a color CRT?

By using three different phosphors, one for each primary color Signup and view all the answers

What is the purpose of the focusing system in a CRT?

To focus the electron beam to the smallest possible spot on the screen Signup and view all the answers

How is the intensity of the electron beam controlled in a CRT?

By adjusting the voltage applied to the accelerating anode Signup and view all the answers

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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Description

Explore the components of a Cathode Ray Tube (CRT), including the accelerating anode, focusing system, deflection system, phosphor screen, and electron gun. Learn about how high-velocity electrons are used to create a visible display on the screen.