The cathode ray tube (CRT) is a vacuum tube used to display images. It has three main parts--the screen, the electron gun and the accelerator. The screen, as the name suggests, displays images. The electron gun produces a beam of electrons aimed at the screen. The accelerator controls the speed and direction of the electron beam. Slight variation in CRT monitors has led to their classification in different categories.
The standard CRT monitors were of size 15, 17, 19 and 21 inches. The problem with these monitors was their bulky size. They were hard to carry and occupied a lot of space on computer desk. A standard rule of such monitors was that the larger the screen area, the heavier the monitor.
To tackle the shortcoming of standard CRT monitors, "short neck" CRT monitors came into being in 1998. Though there was a considerable decrease in the size of the monitor, the picture quality was compromised. Manufacturers addressed this problem consequently one year after its launch.
The spherical CRT monitor was the oldest of the CRT models. As the name suggests, this monitor was like a section of a sphere. The image was generally blurred and rounded at the edges.
Cylindrical monitors did not have the bad structural defects of spherical CRT monitors. The image display of this type of monitor was quite clear. The monitor's screen was relatively flat and displayed better quality images compared to that of spherical CRT monitors.
Flat-screen CRT monitors had little or no curvature of screen. The images displayed on such monitors were of very good quality, employing techniques like dynamic image focusing to form clear images on the flat screen. Due to its better picture quality, flat screen CRT monitors became very popular.
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