8/6/2019 The Future of Display Tech.
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The future of display technology?
Prepared By:
8/6/2019 The Future of Display Tech.
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Presentation Outliney History of display technology
y Current display alternatives
y How FEDs work
y Companies working on FED
y Difficulties with FED
y Future of FED displays
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History of Display Technology
Cathode Ray Tube
1950¶s
Liquid Crystal Displays
1970¶s
Field Emission Displays
1980¶s
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Cathode Ray Tubes (CRT)y Geissler Tubes (1855)
y First CRT oscilloscope invented40 years later
y Commercially practical CRT
made by Allen DuMont (1931)
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Liquid Crystal Display
y Liquid Crystalline materials
discovered (1880s)
y James Fergason produced first
practical LCD display (1967)
y Epson introduced first color LCD
TV 2´ in diagonal (1985)
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Plasma Display Panel
y Plasma identified by William
Crookes (1879s)
y Prototype for PDP introduced at
University of Illinois (1964)
y Fujitsu introduced first 42´ color
PDP (1997)
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y Vacuum tube with phosphor-
coated screen
y Cathode emits electrons to be
accelerated by the anode
y Deflectors guide the electron
beams
y Electrons excite phosphor
molecules to produce light
CRT
Technology Comparison
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Advantages Shortcomings
y Good color representation
y Large viewing angle
y Fast response time (50 µs)
y Low price
y Multiple resolutions
y Large and bulky (2 kg/in)
y Flicker causes eye strain
y High power (11 W/in)
CRT
Technology Comparison cont¶d
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Technology Comparison cont¶d
LCD
y A layer of liquid crystalline
sandwiched between 2 glass
layers with polarizer
y Light generated behind the
screen, passed through
y Applied voltage controls the
crystalline orientation
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Technology Comparison cont¶d
Advantages Shortcomings
y Light weight (0.6 kg/in)
y Low power (5 W/in)
y Less eye strain
y High brightness (500 Cd/m2)
y Small viewing angle
y Slow response time (8 ms)
y Weaker contrast & color
LCD
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Technology Comparison cont¶d
PDP
y Two layers of glass with pixel
array in between
y Each pixel contains a mix of
neon and xenon gas
y Current is passed through a
pixel to ionize gas, and emitUV radiation
y UV rays excites phosphor-
coated layer of glass to
generate light
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Technology Comparison cont¶d
Advantages Shortcomings
y High brightness (1000 Cd/m2)
y High contrast (10000:1)
y Large viewing angle
y More power vs LCD (8 W/in)
y Burn-in effect
y Size limitation (>40´)
y Slow response time
PDP
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FED: The Best of Both WorldsPromised Advantages
y
Very light (100 g/in)y Large Viewing angle (178o)
y Extremely fast (20 ns)
y Low power (0.2 W/in)
y High contrast (10x PDP)
y No flicker
y No dead pixels
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How FED Works?y Array of mini-CRTs
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Technology Options - SEDy Surface-conduction
electron emitter display
y Joint venture betweenToshiba and Canon
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Technlogy Options - Spindty Spindt emitters are tiny
cones that create a very high
charge density y Alignment of the cone and
gate is critical
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Technology Options - CNT
y Carbon nanotubes aselectron source
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Companies Researching FEDy Canon and Toshiba joint venture in SED
y Sony promises Spindt-type FED display in 2009
y Samsung is researching CNTs, Applied Nanotech Inc.have made a 25´ display
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Challenges: Technical Problemsy Fluctuations in emission current
y Low cost manufacturing methods
y Developing for large areasy Tip damage
y High vacuum levels required
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Dropping LCD pricesy LCD panels are dropping in cost while increasing
in quality
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Hope for FED Displays
y The success of FEDs depends on:
y Costy Quality
y Timing
Technologically advantageous product suffersfrom poor timing
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Questions?