( Direct View Storage Tube ) An early graphics screen that maintained an image without refreshing.
What is DVST in CG?
Direct View Storage Tube (DVST) resembles CRT as it uses electron gun to draw picture and phosphor coated screen to display it. The phosphor used in this is of high persistence. DVST does not use refresh buffer or frame buffer to store picture definition.
Where is DVST used?
| Sr. No. Basis DVST | 8. Use of Collector mesh To control the flow of electrons, it uses collector mesh. | 9. Application DVST is only used for the line drawing applications. |
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How many guns are used in direct view storage tube to maintain the picture image on the screen?
A direct-view storage tube (DVST) stores the picture information as a charge distribution just behind the phosphor-coated screen. Two electron guns are used in a DVST. One, the primary gun, is used to store the picture pattern; the second, the flood gun, maintains the picture display .
What is the purpose of flood gun in DVST?
| A. Light weight monitors | C. CRT | D. Portable display |
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What is full form of 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.
Which display refreshing is not required?
Plasma level does not require refreshing.
How many types of computer graphics are there?
There are two types of computer graphics: raster graphics, where each pixel is separately defined (as in a digital photograph), and vector graphics, where mathematical formulas are used to draw lines and shapes, which are then interpreted at the viewer’s end to produce the graphic.
What are the differences between CRT and LCD?
| BASIS FOR COMPARISON CRT LCD | Where Used CRT is used in Televisions and was used in old computer monitors. LCD is used in flat screens. |
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What is the difference between pointing and positioning devices?
Pointing technique refers to look at the items already on the screen whereas the positioning technique refers to position the item on the screen to a new position , i.e., the old current position. The user indicates a position on the screen with an input device, and this position is used to insert a symbol.
Which devices are flat panel displays?
- Plasma display panel (PDP)
- Active-matrix liquid-crystal display (AMLCD)
- Rear projection: Digital Light Processing (DLP), LCD, LCOS.
- Electronic paper: E Ink, Gyricon.
- Light-emitting diode display (LED)
What is the working principle of direct view storage tube?
Principle. The DVBST implements two electron guns : a “flood gun” and a “writing gun”. The writing gun scans across a wire grid, charging the grid to create the negative image. The flood gun then floods the grid.
What is shadow mask method?
A shadow mask is a metal plate punched with tiny holes that separate the colored phosphors in the layer behind the front glass of the screen. Shadow masks are made by photochemical machining , a technique that allows for the drilling of small holes on metal sheets.
Which display devices allow us to walk around an object and view it from different sides?
Which display devices allows us to walk around an object and view it from different sides. Explanation: 3D display devices allows user to view the object from different sides. Explanation: LCD screen is refreshed at 60 frames per second.
Which of the following algorithm is used to fill the interior of a polygon?
| Q. The algorithm used for filling the interior of a polygon is called | B. boundary fill algorithm | C. scan line polygon fill algorithm | D. none of these | Answer» a. flood fill algorithm |
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What do you call the path the electron beam takes at the end of each refresh cycle?
Ans. At the end of each scan line, the electron beam returns to the left side of the screen to begin displaying the next scan line. The return to the left of the screen, after refreshing each scan line is called the horizontal retrace .
