13-06-2012, 01:42 PM
FIELD EMISSION DISPLAY
FIELD EMISSION DISPLAY.ppt (Size: 3 MB / Downloads: 128)
Technology Comparison
Vacuum tube with phosphor-coated screen
Cathode emits electrons to be accelerated by the anode
Deflectors guide the electron beams.
Advantages
Good color representation
Large viewing angle
Fast response time (50 µs)
Low price
Multiple resolutions
LCD
A layer of liquid crystalline sandwiched between 2 glass layers with polarizer
Light generated behind the screen, passed through
Applied voltage controls the crystalline orientation.
Challenges: Technical Problems
Fluctuations in emission current
Low cost manufacturing methods
Developing for large areas
Tip damage
High vacuum levels required
FIELD EMISSION DISPLAY.ppt (Size: 3 MB / Downloads: 128)
Technology Comparison
Vacuum tube with phosphor-coated screen
Cathode emits electrons to be accelerated by the anode
Deflectors guide the electron beams.
Advantages
Good color representation
Large viewing angle
Fast response time (50 µs)
Low price
Multiple resolutions
LCD
A layer of liquid crystalline sandwiched between 2 glass layers with polarizer
Light generated behind the screen, passed through
Applied voltage controls the crystalline orientation.
Challenges: Technical Problems
Fluctuations in emission current
Low cost manufacturing methods
Developing for large areas
Tip damage
High vacuum levels required