Architecture and working of Direct View Storage Tubes (DVST)

Two electron guns are used in a Direct View Storage Tube. A primary electron gun is used where electrons are shot for image pattern generation. When high speed electrons hit the storage grid it displaces the electrons creating a positive charge. The purpose of storage grid is to store image info in the form of charge distribution. The displaced electrons are attracted towards the collector. A flood gun is used for picture display. Now, the continuous flowing slow speed electrons from flood electron gun are attracted to the positively charged regions of the storage grid. They penetrate the storage grid and hit the phosphor coating in CRT generating the output. Here, the collector is used to control the flow of flood electrons.

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