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.
|Published (Last):||14 January 2014|
|PDF File Size:||11.64 Mb|
|ePub File Size:||12.24 Mb|
|Price:||Free* [*Free Regsitration Required]|
It is similar to CRT as dsvt as the electronic gun and phosphor-coated mechanisms are concerned. This flood of electrons is produced by a “flood gun” This is separate frame the electron gun that produces the main electron beam.
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. For any type of query or something that you think is missing, please feel free to Contact us.
Related Articles on Computer Graphics. Now the problem arises as to how do we remove the picture, when the time for it’s erasure or modification comes up. 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. Thus, the electrons attracted by the positive charges pass through the mesh, travel on to the phosphor coated screen and display the picture.
Where he writes how-to guides around Computer fundamentalcomputer software, Computer programming, and web apps. But only those electrons that hit the dotted circle pass through and hit the CRT screen.
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. Explain Beam-penetration and Shadow-mask method How are refresh rates calculated?
What is VGA video graphics array? 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.
Just behind the storage mesh is a second grid called the collector.
This is mainly so when only portions of the picture are to be modified in an interactive manner. This removes all charges and clears the screen. The function of the collector is to smooth out the flow of flood electrons. What is Interlaced or Non-Interlaced Monitors? Since the collector has slowed the electrons down, they may not be able to produce sharp and bright images.
Dinesh authors the hugely popular Computer Notes blog. 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.
The negatively charged mesh repels others. What is Low Resolution? But this technique also produces a momentary flash, which may be unpleasant to the viewer.
What is Dot Pitch? The simple method is to apply a positive charge to the negatively charged mesh so that it gets neutralized.
DVST Definition from PC Magazine Encyclopedia
Pictures drawn on there will be seen for several minutes minutes before fading. 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. 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.
Mail Me At Computer Notes. But 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.