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Conceptually the Direct View Storage Tube(DVST) behaves like a CRT with highly persistent phosphor. Pictures drawn on will be seen for several minutes (40-50 minutes) before fading. It is similar to CRT as far as the electronic gun and phosphor coated mechanisms are concerned. But instead of the electron beam directly writing the pictures on the phosphor coated CRT screen, the writing is done with the help of fine-mesh wire grid. The grid made of very thin, high quality wire is located with a dielectric and is mounted just before the screen on the path of the electron beam from the gun. A pattern of positive charges is deposited on the grid and this pattern is transferred to the phosphor coated CRT by a continuous flood of electrons'. This flood of electrons' is produced by a "flood gun" (This is separate frame the electron gun that produces the main electron beam).
Just behind the storage mesh is a second grid called the collection. The function of the collector is to smooth out the flow of flood electrons. Since large number of electrons are produced at high velocity by the flood gun, the collector grid, which is also negatively charged reduces, the acceleration on these electrons and the resulting low velocity flood pass through the collector and get attracted by the positively charged portions of the storage mesh (Since the electrons are negatively charged), by are repelled by the other portions of the mesh which are negatively charged (Note that the pattern of positive charges residing on the storage mesh actually defines the picture to be phosphor-coated screen and display the picture. Since the collector has slowed down the electrons, they may not be able to produces sharpand bright images. To over come this problem, the screen itself is maintained at a high positive potential be means of a voltage applied to a thin aluminum coating between the tube face and the phosphor. The other popular display device is the plasma panel device, which is partly similar to the DVST in principle, but over comes some of the undesirable features of the DVST.
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With the help of a diagram explain the working principle of DVST system?
chuitya giri
Explain the use of direct view storage tube?
DVST has inherent image storing capacity so that it avoids flickering of image which has been displayed on computer screen.
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What do you understand by dvst?
basically this device is based on inherent image storage capability.plasma panel and laser scan display is based on this technology but DVST is most widely used in graphical displays
Does Archimedes' principle explain how airplanes fly?
No, it does not. That phenomenon is explained by Bernoulli's principle.
What does pascals principle help explain?
Pascal's principle helps explain how changes in pressure applied to a confined fluid are transmitted uniformly in all directions throughout the fluid. This principle is the basis for hydraulic systems, which use fluid pressure to transmit force and control machinery. It also helps understand phenomena such as how blood pressure is maintained in the circulatory system.
Which gun is used in DVST?
1) Primary gun 2) Flood gun
How does Bernoulli principle work?
The Bernoulli principle states that as the speed of a fluid increases, its pressure decreases. This is because the kinetic energy of the fluid increases at the expense of its potential and internal energies. This principle helps explain phenomena such as lift in aerodynamics and blood flow in the circulatory system.
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