Explain direct view storage tubes and l iquid crystal displays ?

Liquid crystal displays

• Refers to the compounds having crystalline arrangement of molecules flow of liquid.
• Two plates each glass plate contains a light polarized that are right angles to each other
• Two types
  Passive matrix LCD
  Active matrix LCD

Direct view storage tubes

• Alternative method for maintaining a screen image
• Stores picture information as a charge distribution
• Very complex pictures can be displayed at very high resolutions
• To eliminate the picture section the entire screen must be erased
• The erasing and redrawing process can take several seconds for a picture