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Working Principle of the Cathode Ray Tube

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    Cathode ray tube is used for producing images, when an electron beam hits the surface made out of a phosphorescent, and the cathode ray tube is basically a vacuum tube. An example of a cathode ray tube is a computer desktop and the picture tubes in television are similar to the cathode ray tube in television. There are numerous components of cathode ray tube, which are the Electron gun, Anodes, Coil, Phosphor-coated screen, electronic beam and the spot through which the beam passes through.

    In a cathode ray tube, the electronic gun has to A nodes, two coils in the centre, which is known as the ELF field, as the electronic beam passes from the A nodes to the spot in the phosphor coated screen which has a spot in between. The spot is produced by the light which strikes the phosphor coated screen. Anode and Cathode are used as synonyms, where anode is the positive side of a battery and cathode is the negative side of the battery. There is a glass tube in which a vacuum is created, in which there is the cathode, in shaped of a heated filament.

    Since anode is positive and electrons are negative, this makes the anode attract electrons which are spilling out of the cathode. For example, in a television, to focus on the spreading of electron, tight beam is used and accelerated by an anode which increases its speed. Cathode ray tube was one of the initial tools to form color displays by coating phosphors and forming pictures containing different colors. The main problem which occurs with graphics is that a picture must be produced which has the same color characteristics input at run time.

    The part which requires a picture to be produced is simple. To integrate colored displays, one must know about the basic colors used for pictures, which are red, blue and green. These three colors are primary colors and can produce any other color; different ratios of the three primary colors need to be chosen to accomplish this and a person can form million different colors. The color display also involves basic phosphors, which in turn can form the three primary colors.

    Technology needs to be available if an individual wants to combine the three primary colors in different combinations. The two methods through which color displays can be produced, by the assistance of cathode ray tube are beam-penetration method and shadow-mask method. Beam penetration methods Beam penetration method is a technique of producing colors, as is used along with the Random Scan System, which is for displaying color. The colors used in the beam penetration methods are red, green, yellow and orange.

    The color dependency means that few colors are available in the beam penetration method because the electron beam determines the speed of the beam penetration. The cost of this method is low as compared to the second technique, which is shadow mask. The picture quality through the beam penetration method is not appealing as compared to the other technique but it gives high resolution. The process which determines color production using the beam penetration method involves electrons, which excite green and red layer and define the color display. Shadow mask method

    Shadow mask method is a technique of cathode ray tube where shadow mask is used with the Raster Scan System. This system is used for displaying colors, which are in millions. These million colors are formed because the colors present in the Shadow Mask are dependent on the kind of ray available and this technique is expensive as compared to any other technique. This technique is expensive because when a picture is formed using the shadow mask technique, it gives a shadow effect and provides the developer with numerous colors; however these colors have low resolution.

    There are no criteria set for the shadow mask technique, as colors can be produced and used in television and computers. This technique works when the three basic colors are combined, which are red, blue and green and are taken in appropriate proportions to know about the integration of colors. However, this process is more stabilized and sophisticated. The cathode ray tubes shadow mask technique utilizes three guns which are placed side by side and they form a triangle or a delta, which every pixel on the picture is formed by phosphors, which is of three types.

    This is in order to create the red, blue and green colors and the screen which is before the phosphors screen is known as shadow mask. The shadow mask plate has holes which are strategically placed and when the electron guns hits the beam on a specific hole; the phosphors hits the same color which is found on the screen. In the cathode ray tube, the electron beams were being monitored and the intensity was manipulated of the three colored beams side by side. In case the intensity of red beam is high, then he final combination would be declared the red color. To fine tune the intensities of the beams is a very simple task and because of this a person can get more combinations, as compared t the beam penetration technique of cathode ray tube. However, the shadow mask does have its disadvantages. Firstly, the focus of the beams is necessary, and this makes the role of the shadow mask technique very critical. If the person fails to achieve the focus of the beam, then this would give a poor result.

    In addition, each pixel point in the shadow mask technique is made up of three different colors, which reduces the number of resolutions of the cathode ray tube; the person would be able to view a picture, through a very small screen. The beam penetration technique is similar to the cathode ray tube which takes advantage of the different colors of phosphorus, present in different layer. Each layer of phosphorus is allotted on color and the arrangement of the beam penetration method is similar to the cathode ray tube method.

    The beam penetration method can produce a maximum number of four to five colors, whereas the shadow mask technique can produce millions of colors. The organization of colors in this technique is red, green and blue which is similar to the shadow mask technique. These colors are coated in layer and are place one behind the other. If the beam which hits cathode ray tube is low, then the phosphorus colors are activated and the beam would further activate two colors, which are red and green. The basic problem with this method is that it produces few colors.

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