List out the merits and demerits of dvst, Computer Graphics

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List out the merits and demerits of DVST?

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

It has a flat screen
Refreshing of screen is not needed COMPUTER GRAPHICS
Selective or part erasing of screen is not possible
It has poor contrast
Performance is inferior to the refresh CRT.

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