The aging or end of the tube causes loss of contrast and definition. Usage AreasĬRT technology has been widely used in television and computer monitors, oscilloscopes, spectroscopy, and other measuring devices and radars. It currently has a fairly high price compared to CRTs, especially on televisions. While the response time is decreasing, it allows for fast movements, which are an important element for use in computers, and for some models, such as action, video games. These new display types have some advantages such as small size and lower power consumption, but they have disadvantages as black color is very clearly shown, the response time is high compared to CRT and does not show colors evenly. Since plasma and LCD screens are gradually replacing cathode tube screens, we can say that cathode tubes fashion is completely over now. With the firing or stopping of the electron gun, the sweep deceives the eyes, believing that only a few pixels on the screen are illuminated. The human eye cannot visualize this sweep due to constant vision. This screen is covered with a thin layer of phosphorescent elements called phosphors that emit light through excitation, that is, when electrons hit them, thereby forming a light spot called Pixel.Īctivation of the magnetic field causes the electrons to follow a scan pattern by landing from left to right after reaching the end and then to the next line. It is created by two electric X and Y plates that send the current in horizontal and vertical directions, respectively. The magnetic field directs electrons from right to left and from top to bottom. The anode acts as an accelerator and concentrator for electrons and creates an electron flow directed to the screen. The cathode emits electrons attracted to the anode. The electron gun consists of a cathode, a negatively charged metal electrode, and one or more anodes (positively charged electrodes). Finally, there is a phosphor of red, green, blue colors that will serve to create color images from black to white with a combination of three primary colors. This may be the traditional type used by Sony televisions or the Wega Trinitron type. The screen has a shadow mask that is responsible for ensuring that each color ball ( RGB) only alerts the corresponding color points. There are deflection coils (yoke) between the neck and the bell on the outside, it has the function of deflecting the electrons from the sieve and makes a sweep on the entire surface of the screen. In this way, a condenser forms between the core (Ecuador) and the inside of the tube, the glass acts as a dielectric. Outside, in the hood area, it is covered with black paint, ACUADAC, which is the center of the CRT. Inside the hood is the anode, which attracts electrons produced at the cathode and collapses at high speed against the phosphor-coated screen, which, when shot by the electrodes, produces equally bright light to create images. On the neck, we find the filament as the first component responsible for the heating of the second component, the cathode, then the control grid (G1), the display grid (G2) and finally the Focus (G3), which are generally called focal, all of which have the special function of accelerating the electron beam, thus, it reaches the surface of the phosphor where the spotlighting on the CRT screen is produced. CRT ComponentsĬRT neck, headline, the screen is divided. Weinhart from the Western Electric Society. The first version using the hot cathode was developed by J. This tube is sometimes called the Braun tube.
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