Field Emission Displays
-
Upload
justina-wilcox -
Category
Documents
-
view
54 -
download
1
description
Transcript of Field Emission Displays
![Page 1: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/1.jpg)
The future of display technology?
Prepared By: Ryan MichaudAdam NealeAndrei Iakimtchik
Date: March 27th, 2007.
![Page 2: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/2.jpg)
Presentation OutlineHistory of display technology Current display alternativesHow FEDs workCompanies working on FEDDifficulties with FEDFuture of FED displays
![Page 3: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/3.jpg)
History of Display Technology
Cathode Ray Tube1950’s
Liquid Crystal Displays1970’s
Field Emission Displays1980’s
![Page 4: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/4.jpg)
Cathode Ray Tubes (CRT)Geissler Tubes (1855)
First CRT oscilloscope invented 40 years later
Commercially practical CRT made by Allen DuMont (1931)
![Page 5: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/5.jpg)
Liquid Crystal Display
Liquid Crystalline materials discovered (1880s)
James Fergason produced first practical LCD display (1967)
Epson introduced first color LCD TV 2” in diagonal (1985)
![Page 6: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/6.jpg)
Plasma Display Panel
Plasma identified by William Crookes (1879s)
Prototype for PDP introduced at University of Illinois (1964)
Fujitsu introduced first 42” color PDP (1997)
![Page 7: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/7.jpg)
Vacuum tube with phosphor-coated screen
Cathode emits electrons to be accelerated by the anode
Deflectors guide the electron beams
Electrons excite phosphor molecules to produce light
CRT
Technology Comparison
![Page 8: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/8.jpg)
Advantages Shortcomings
Good color representationLarge viewing angleFast response time (50 µs)Low priceMultiple resolutions
Large and bulky (2 kg/in)Flicker causes eye strainHigh power (11 W/in)
CRT
Technology Comparison cont’d
![Page 9: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/9.jpg)
Technology Comparison cont’dLCD
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
![Page 10: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/10.jpg)
Technology Comparison cont’d
Advantages Shortcomings
Light weight (0.6 kg/in)Low power (5 W/in)Less eye strainHigh brightness (500 Cd/m2)
Small viewing angleSlow response time (8 ms)Weaker contrast & color
LCD
![Page 11: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/11.jpg)
Technology Comparison cont’dPDP
Two layers of glass with pixel array in between
Each pixel contains a mix of neon and xenon gas
Current is passed through a pixel to ionize gas, and emit UV radiation
UV rays excites phosphor-coated layer of glass to generate light
![Page 12: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/12.jpg)
Technology Comparison cont’d
Advantages Shortcomings
High brightness (1000 Cd/m2) High contrast (10000:1)Large viewing angle
More power vs LCD (8 W/in)Burn-in effectSize limitation (>40”)Slow response time
PDP
![Page 13: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/13.jpg)
FED: The Best of Both WorldsPromised Advantages
Very light (100 g/in)Large Viewing angle (178o)Extremely fast (20 ns)Low power (0.2 W/in)High contrast (10x PDP)No flickerNo dead pixels
![Page 14: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/14.jpg)
How FED Works?Array of mini-CRTs
![Page 15: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/15.jpg)
Technology Options - SED“Surface-conduction
electron emitter display”
Joint venture between Toshiba and Canon
![Page 16: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/16.jpg)
Technlogy Options - SpindtSpindt emitters are
tiny cones that create a very high charge density
Alignment of the cone and gate is critical
![Page 17: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/17.jpg)
Technology Options - CNT
Carbon nanotubes as electron source
![Page 18: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/18.jpg)
Companies Researching FEDCanon and Toshiba joint venture in SEDSony promises Spindt-type FED display in 2009Samsung is researching CNTs, Applied Nanotech Inc.
have made a 25” display
![Page 19: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/19.jpg)
Challenges: Technical Problems Fluctuations in emission current Low cost manufacturing methods Developing for large areas Tip damage High vacuum levels required
![Page 20: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/20.jpg)
Dropping LCD pricesLCD panels are dropping in cost while increasing
in quality
![Page 21: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/21.jpg)
Hope for FED Displays
The success of FEDs depends on:CostQualityTiming
Technologically advantageous product suffers from poor timing
![Page 22: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/22.jpg)
Questions?
![Page 23: Field Emission Displays](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813478550346895d9b58b0/html5/thumbnails/23.jpg)