What are the merits and demerits of DVST?

DVST :  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.

Advantages and disadvantages of DVST:


Advantages:

1. Refreshing is not essential.
2. Without flicker, very complex pictures can be exhibit at very high resolution.
 

Disadvantages:

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

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