Direct View Storage Tube

Direct View Storage Tube (DVST)

Stores picture as a charge distribution just behind the phosphor coated screen

Two Electron Gun used
1. primary Gun
2. Flood Gun

Primary Gun - store picture pattern
Flood Gun - maintain picture display
Advantage – No refreshing, very high resolution without flicker,
Disadvantage - Selected parts of picture cannot be erased





FLAT PANEL DISPLAY


Reduced volume,weight ,power than crt

Two categories
emissive display(emitters)
non emissive display

Emissive display-convert electrical energy into light(Plasma Panels, Led)

Nonemissive display-convert light into graphics pattern(LCD)
Plasma panel display called as gas discharge display
Glass plates
Neon gas
Vertical & horizontal conducting ribbon
Firing voltage ,gas break down into plasma of electrons and ions