What is the difference between crt and lcd monitors

A cathode-ray tube CRT is a large, sealed glass tube. While An LCD monitor is a desktop monitor that uses a liquid crystal display to produce images. These monitors produce sharp, flicker-free images. A CRT monitor is a desktop monitor that contains a cathode-ray tube.

The front of the tube is the screen. A inch monitor, for example, may have a viewable size of 20 inches. Complete mechanism of CRT Display is shown in the above figure. As one can look onto the figure that there is a cathode at the back of the tube. In front of the cathode there is an electron gun that emits electrons. Then a positively charged anode is present in front of the electron gun. Then there are horizontal and vertical plates called as X-plates and Y-plates respectively.

Then at the very front of the tube, there exists a fluorescent screen upon which the beam of the electron strikes. The electron gun emits electron beams. These electrons emitted from the electron gun are negatively charged while the anode following the electron gun is positively charged.

Hence negatively charged particles are attracted towards the anode that is positively charged. That electron beam passes through the vertical and horizontal plates to strike the fluorescent screen. The fluorescent screen has phosphors dots on it of three different colors; red, green and blue.

These are the primary colors while all the other secondary colors are made by combining these basic colors. When the electron beam emitted from the electron gun strikes the phosphors dots, these dots glow.

That glowing of colors makes the picture to be visible on the monitor screen. Usually CRTs are bulky, high weighted and have larger infrastructure as compared to LCDs which are not that much bulky. These monitors consume more power to operate.

A cathode-ray tube monitor is a display device used in television sets and computer monitors. It is a kind of vacuum tube which contains one or more electron guns, electrostatic deflection plates and a phosphor target which is located at the back of the glass screen. Here, a layer of liquid crystal is placed between 2 polarizing films.

When light emitted by an external source falls on the layer of liquid crystal then their combination generates a coloured visible image that is displayed on the screen. A backlight present at the back end of the screen emits light that after passing through the polarizing film gets polarized.

The light can be horizontally or vertically polarized that rely on the type of polarization filter. An external potential is provided to the liquid crystal.

This potential changes the orientation of the molecules. After this polarized light is passed to the crystal that generates bright and dark spots at the screen of the display. Despite LCD is more costly than CRT but due to its better image display and almost negligible flickering property, it is widely used.

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