Friday, June 24, 2011

About Cathode Ray Tube Monitors

These days, one can find massive change in technological advancement. Still there are several people who prefer buying traditional gadgets. One such traditional device is the Cathode Ray Tube (CRT) monitors. These monitors illustrate magnificent picture quality and are available at reasonable prices. With the moving electron beam of cathode tube back and forth, CRT monitors automatically create images.

Furthermore, to enhance the sharpness of the monitor display and to obtain correct images on screen, you can use three ways to filter the electronic beam such as:

  • Shadow mask: It is a thin metal screen packed with small holes through which electron beam will pass at right intensity, focusing on CRT display. It will for sure create preferred images and colors on the display.
  • Aperture grill: It consists of tiny vertical wires, to light up the phosphor on the faceplate. With its flat faceplate it shows less distorted images on the display of the CRT.
  • Slot mask: A slot-mark tube is a combination of aperture grill and shadow-mask technologies that produce brightness through phosphor dots.
Most computers now available now come with the built in sound card which is coupled with the mother board and installed in the PCI slot. But if a use s not satisfied with the quality of the built in sound card then he can disable it and install his own separate external sound card if you want to perform major tasks like audio editing and audio mixing.

There are even USB sound card available which an be just plugged into the compute and brought to use

How cathode ray tube works

Working of cathode ray tube initiates by moving an electron beam back and forth across the back of the screen. As soon as beam passes across the screen, visible image is created. Thereby, inside the glass tube, phosphor dots lights up the active portion of the screen.

By drawing many such lines from top to the bottom of the screen, it creates a screen full of images which is achieved in three-color combinations including Red/Green/Blue, which is considered as RGB mode.

By drawing many such lines from top to the bottom of the screen, it creates a screen full of images which is achieved in three-color combinations including Red/Green/Blue, which is considered as RGB mode.

In this, the terms anode (positive) and cathode (negative) are used in electronics. Here a cathode ray tube is a heated filament in a vacuum, which is created inside a glass "tube". An electron gun will generate “ray” that pours off a heated cathode into the vacuum whereas, the anode attracts the electrons pouring off the cathode because of its positive characteristic. With the use of Phosphor, the screen is coated, which is considered as an organic material that glows when struck by the electron beam.

History Of CRT computer
The German physicist Ferdinand Braun invented the earliest version of the CRT in 1897, which is further recognized as the Braun tube. It is a great modification of the Crookes tube and a phosphor-coated screen that is known as a cold-cathode diode.
Later on in 1907, an experimental video signal was used to form a picture in CRT. For the first time, CRT technology left a remarkable impact and it managed to display simple geometric shapes onto the screen. In 1922, with the use of hot cathode by Harry Weiner Weinhart and John B. Johnson, CRT monitor became a commercial product.

Pros And Cons Of Cathode Ray Tube Monitor
CRT monitors comprise of several advantages that include finest image quality, better contrast or brightness ratios, near zero color that will let you experience excellent viewing angle, easily scaling to various resolutions and availability at pocket soothing rates.
Apart from these advantages, some drawbacks of CRT include large size and weight, geometric distortion caused by variable beam travel distances and huge electricity consumption that generates immense heat while working.

Pros And Cons Of Cathode Ray Tube Monitor
If you are looking forward to buy a CRT computer monitor, it is essential to decide, how much resolution you require for your monitor. The size of monitor depends on resolution thus, higher the resolution; the bigger the monitor required. These days, one can easily avail the CRT monitor in varied sizes including 14", 15", 17" and 21" etc. The monitor resolution is measured in pixels and different monitors have different resolution such as
  • VGA: 640 x 480 pixels
  • SVGA: 800 x 600 pixels and
  • XGA: 1024 x 768, 1280 x 1024, 1600 x 1200, 1600 x 1280 and 1800 x 1440 pixels

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