Bob Anderson’s invented the bistable Direct-View Storage Tube (DVST) in and the result was the Tek storage oscilloscope. Computer researchers. Direct View Storage Tube (DVST) – Direct View Storage Tube (DVST) – Computer Graphics Video Tutorial – Sequential Circuit Design video. DVST. (Direct View Storage Tube) An early graphics screen that maintained an image without refreshing. The entire screen had to be redrawn for any change.
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Since a 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 chargedbut 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 displayed.
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. To over come this problem, the screen itself is maintained at a high positive potential by means of a voltage applied to a thin aluminum coating between the tube face and the phosphor. But only those electrons that hit the dotted circle pass through and hit the CRT screen.
Also, since the electrons hit the CRT screen at very low speeds though they are slightly accelerated in the last part of their journey to the CRT by a positively charged aluminum coatingthe contrasts are not sharp. The function of the collector is to smooth out the flow of flood electrons. Now the problem arises as to how do we remove the picture, when the time for it’s erasure or modification comes up. The negatively charged mesh repels others. This is mainly so when only portions of the picture are to be modified in an interactive manner.
Just behind the storage mesh is a second grid called the collector. Pictures drawn on there will be seen for several minutes minutes before fading. What is Interlaced or Non-Interlaced Monitors?
What is DVST?
Since the collector has slowed the electrons down, they may not be able to produce sharp and bright images. Since the phosphor is of a very high persistence quality, the picture created on the CRT screen will be visible for several minutes without the need for being refreshed.
This removes all charges and clears the screen. This flood of electrons is produced by a “flood gun” This is separate frame the electron gun that produces the main electron beam. Dvstt instead of the electron beam directly writing the pictures on the phosphor coated CRT screen, the writing is done with the help of a fine-mesh wire grid.
What is Dot Pitch? But this technique also produces a momentary flash, which may be unpleasant to the viewer.
Computer Aided Design: Direct View Storage Tube
What is VGA video graphics array? Dinesh authors the hugely popular Computer Notes blog. Explain Beam-penetration and Shadow-mask method How are refresh rates calculated?
Thus, the electrons attracted by the positive charges pass through the mesh, travel on to the phosphor coated screen and display the picture. The grid made of very dieplay, 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.
What is Low Resolution? What is LED light emitting diode?
The dotted circle on the mesh is created by positive charges the flood of electrons hit the mesh at all points. Related Articles on Computer Graphics. The simple method is to apply a positive charge to the negatively charged mesh so that dsplay gets neutralized.
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DVST Definition from PC Magazine Encyclopedia
For any type of query or something that you think is missing, please feel free to Contact us. Mail Me At Computer Notes. It is similar to CRT as far as the electronic gun and phosphor-coated mechanisms are concerned.