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The CRT Computer monitorTel: 0870 3000 905 email: sales@computerdisplays.co.uk Based Near: Ely, Cambridgeshire |
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 P+P costs for a TFT computer monitor is only £13.95 |
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Pay securely through our online payment system. We accept all major credit and debit cards. Click here for details. We provide our new flat panel tft monitors with a minimum of 1 years Manufacturer warranty |
The Cathode Ray Tube Computer Monitor
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Many computer monitors in use today rely on a device known as the cathode ray tube, or CRT, to display their images. LCD computer screens are in common use, but they are still rare when compared to CRT computer monitors, particularly in the home. It is even possible to make a television screen out of thousands of ordinary 60-watt light bulbs! You may have seen something like this at an outdoor event like a football game. Let's start with the CRT, however, because CRT technology is the most common way of displaying images today.
The terms anode and cathode are used in electronics as synonyms for positive and negative terminals. For example, you could refer to the positive terminal of a battery as the anode and the negative terminal as the cathode. In a cathode ray tube, the "cathode" is a heated filament (not unlike the filament in a normal light bulb). The heated filament is in a vacuum created inside a glass "tube." The "ray" is a stream of electrons that naturally pour off a heated cathode into the vacuum. Electrons are negative. The anode is positive, so it attracts the electrons pouring off the cathode. In a TV's cathode ray tube, the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode. This tight, high-speed beam of electrons flies through the vacuum in the tube and hits the flat screen at the other end of the tube. This screen is coated with phosphor, which glows when struck by the beam, thus giving off the picture that you can see on your computer monitor. |
