(F E D) FIELD EMISSION DISPLAY

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(F E D)FIELD EMISSION DISPLAY

• DEEPAK GUPTA
• EC 3rd YR.
• 0800131034

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PLAN OF PRESENTATION

• WHAT
• WHEN APPS.
• HOW ADV.
• CHARACTERISTICS

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FED

• FED is such a display that works a bit like a
  cathode-ray tube, except that electrons are
  emission procedure
• Instead of one cathode emission spraying of
  electron through number of hole is done

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HISTORY

• In 1968, Charles A. "Capp" Spindt at the Stanford
  Research Institute had the idea of fabricating a
  flat display using microscopic molybdenum cones
  singly or in arrays (FEAs)
• This development was the enabling technology the
  concept for using FEAs in a matrix addressed
  display (FED)

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Assembly of FED Device
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FED Principles
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Cathode
The cathode/back plate is a matrix of row and
column traces. Each crossover lays the foundation
for an addressable cathode emitters. Each
crossover has up to 4,500 emitters, 150 nm in
diameter. This emitter density assures a high
quality image through manufacturing redundancy,
and long-life through low operational stress.
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Emission
Emitters generate electrons when a small voltage
is applied to both row (base layer) and column
(top layer).
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FED PACKAGING

• The field emission display screens are comprised
  of a thin sandwich. In this the back is a sheet
  of glass or silicon that contains millions of
  tiny field emitters which is the cathode. The
  front is a sheet of glass coated with phosphor
  dots, which is the anode.

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FED CHARACTERISTICS

• Comparing with the CRT displays the field
  emission displays has many advantages.
• They are

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• Brightness
• 2. Speed
• 3. Compact and lightweight
• 4. Display size
• 5. Low driving voltage
• 6. Wider viewing angle
• 7. High illumination
• 8. Colour Quality

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FED advantages
Technology Luminous Efficiency (Lm/W)
CRT (at 30KV) 3
PDP 0.8
LCD 3
OLED / PLED 5
FED at 8 KV 7

• Inherently high luminous efficiency
• No Response Time issues
• CRT-like Colour Gamut
• Lower Power Consumption
• Cold Cathode Emission
• Distance between cathode and screen 0.25mm
• Flat Panel Technology
• Matrix Addressed No DY
• Capital investment for manufacturing VLS TV with
  printable CNT FEDs - 1/10th of LCD
• Cost advantage over LCD could be 40

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APPLICATION

• This technology could produce affordable large
  displays in the 20 to 40-inch diagonal range
  suitable for TVs.

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DRAWBACKS

• a. Vacuum tubes do require maintenance.
• b. Current FEDs often suffer from variation in
  screen brightness across the display, and also
  within each pixel.
• c. Durability due to electrical discharge in the
  small gaps everywhere in FED prototypes.
• d. The killing problem was durability the tips
  could not survive under severe conditions of
  arcing (i.e. electrical discharge) due to the
  small gaps everywhere in FED prototypes.

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• Thank you ...