What is a CRT Monitor

Cathode Ray Tube or CRT monitors are the oldest form of display for PC computer systems. These monitors are high resolution monitors and continue to be the technology of user’s choice today also. Most monitors use Cathode ray tubes, which are glass vacuum tubes into which an electron gun emits a flow of electrons. The electron gun is made up of cathode (negatively charged) and one anode (positively charged). The operation of a CRT monitor is basically very simple. A heating element in CRT heats the cathode and the cathode emits electrons. An image is displayed by scanning the electron beam across the screen and this image needs to be refreshed continually. In order to avoid any kind of fluctuation or flicker of screen, most monitors refresh the screen at a 60 Hz rate.

Besides its bulky shape, weight and high voltage requirements, the CRT offers many advantages over its competitors. The CRT monitors requires a single driver to drive the tube’s cathode or three drivers for a color display whereas the other display systems requires a driver for each picture element or each pixel. Cathode Ray Tube monitors also offer excellent contrast, luminance and better display resolution than its competitors.

All CRT monitors are sold depending on their screen size which is based on the diagonal measurements of the screen from lower corner to the opposite side upper corner in inches. The tube of the monitor is partially covered by case of the screen which is external and the tube cannot project an image to the edges of the full size tube. The viewable or visible area of the monitor is approximately .9 to 1.2 inches smaller than the tube diagonal.

The customers normally overlook the size of the cabinet when purchasing a CRT. As these are very bulky in size so the user wants the monitor to be fitted in the space which he or she is available with. Main thing to be considered is the depth of this monitor which consumes a lot of space. One more disadvantage is that these large monitors can force the display of monitor extremely close to the user or restrict the keyboard usage which is uncomfortable for the user. That’s the reason the users have shifted towards LCD or even LED display which allows them to save a lot of space and is day by day depreciating in the prices as well.

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