This metal plate is known as shadow mask. A metal plate with tiny holes is placed in front of the fluorescent screen to ensure that the electrons from each gun strike the corresponding monochromic phosphor. Resolution: A colour CRT display has three electron guns and three different phosphors on the screen which emit red, blue and green light respectively.Let’s compare the performance of them in different aspects: The liquid crystal displays have become more and more popular in recent years. We can look at some comparisons to justify this but also look at the reasons for which it has been replaced.īy 2008, although CRT TV and computer displays were still used in developing countries, they had almost disappeared in the developed world. The demise of CRT in the present day commercial sector(televisions etc) is interesting in that CRT based technology remains superior in several ways to competitors such as the LCD. The image will appear when electrons hit the phosphor screen. It can control the path of the electrons by adjusting the strength of the magnetic field. A magnetic field perpendicular to the E field is imposed by deflecting coils. However they have gradually been replaced by liquid crystal (LCD) and plasma displays in many applications.Īn electric field is placed in front of the electron gun and is used to accelerate the electrons emitted by the electron gun. It is used to create images, widely applied on display devices such as televisions, oscilloscopes and computer monitors. Their invention dates back to 1897, they have been found most commonly in the television since the late 1930's.Ī simple CRT mainly consists of an electron gun (include an accelerating electric field), a deflection coils, a shadow mask and a fluorescent screen (picture on the right). Cathode ray tubes have a long illustrious history.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |