Explain the merits and demerits of DVST.

4 years ago
Computer Graphics

The merits and demerits of direct view storage tubes [DVST] are as follows;

Merits

  • It has a flat screen
  • Refreshing of screen is not required
  • Selective or part erasing of screen is not possible
  • It has poor contrast
  • Performance is inferior to the refresh

Demerits

  • They normally never display colour.
  • Selected part of picture never removed.
  • It can take quite a few seconds for composite pictures while redrawing and erasing process.

DVST stands for Direct View Storage Tube. It is one of the display devices in which an electron flood gun and writing gun is present. The flood gun floods electrons to a wire grid on which already the writing gun has written some image.

The electrons from the flood gun will be repelled back by the negatively charged wire grid which has been charged so by the writing electron beam. The part of the wire grid which has not been charged -ve will allow the electrons to pass through and the electrons will collide on the screen and produce the image.

9
Rajiv Shah
Rajiv Shah
Sep 24, 2021
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