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A
PRESENTATION
ON
SURFACE CONDUCTION ELECTRON EMITTER
Submitted in Partial Fulfillment for the Award of Degree of
BACHELOR OF TECHNOLOGY
IN
Electronics & Communication Engineering
2012-13
Submitted to: Submitted By:
Ms. SMRITI SACHAN ROHITASH GARHWAL
Mr. AMIT KUMAR JAIN IV Year ECE (EC/09/137)
DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING
POORNIMA COLLEGE OF ENGINEERING
ISI-6, RIICO INSTITUTIONAL AREASITAPURA, JAIPUR-302022
(RAJASTHAN)1
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CONTENTS
INTRODUCTION
HISTORY
TECHNOLOGY
HOW IT WORKS ADVANTAGES
SED CHARACTERISTICS
DISADVANTAGES
COMPARISION
PRICING
FUTURE SCOPE
CONCLUSION
REFERENCES 2
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INTRODUCTION
A surface-conduction electron-emitter display (SED) is
a display technology which has been developing various
flat panel displays by a number of companies
Co-developed by Canon and ToshibaCorporation
A best inter mix of LCD & CRT technologies
An SED display is very similar to a CRT
It uses surface conduction electron emitters for everyindividual display pixel.
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HISTORYCanon began SED research in 1986
In 2004 canon and Toshiba announced a jointdevelopment agreement targeting commercial production
of SEDs by the end of 2005During the 2006 Consumer Electronics Show in LasVegas, Nevada , Toshiba showed working prototypes ofSEDs
On 25 May 2007, Canon announced that the prolonged
litigation would postpone the launch of SED televisionsCanon officially announced on 25 May 2010 the end ofthe development of SED TVs for the home consumermarket
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TECHNOLOGY
Electrons are scattered at the receiving pole and areaccelerated toward the display surface
The surface conduction electron emitter apparatus
consists of a thin slit across which electrons tunnel whenexcited by moderate voltages. 5
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HOW IT WORKS
It is similar to CRT displays but here it uses millions of
surface conducting electron emitters (SCE).
The SCEs are arranged in a matrix form .
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Each pixel has a set of three SCEs and for a high definition display we find
6 million SCEs.
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CONT.
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Working of sed
Internal structure8
CONT
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SED screens consist of two glass sheets separated by a
few millimeters, the rear layer supporting the emitters and
the front the phosphors.
When the electrons cross electric poles across the thinslit, some are scattered at the receiving pole
They are accelerated towards the display surface by a
large voltage gradient between the display panel and the
surface conduction electron emitter apparatus.
The SED display offer brightness, color performance
and viewing angles on par with CRTs.
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CONT
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ADVANTAGES0.2 milliseconds response time.
Brightness of 450 cd/m 2 . 50,000:1 contrast ratio. at the 2006 CES show,
Toshiba's final versions of SEDs will ship with a
contrast ratio of 100,000:1
Excellent color and contrast potentialWide viewing angle
Low power consumption
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http://en.wikipedia.org/wiki/File:Sed1.gifhttp://en.wikipedia.org/wiki/File:Surface-conduction_electron-emitter_display_2.png7/28/2019 Ppt On "SURFACE CONDUCTION ELECTRON EMITTER"
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IMAGES
Provide dynamic color expressions, a sharppicture, and perform faster video response .
It possible to create screens of more than
40" in size that are only several centimeters
thick. 11
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SEDCHARACTERISTICS
Very high contrast ratio.
Fast response time.
High brightness.
180 degree Viewing angle
Viewable in bright room.
It can be used in mobile device display.
Low power consumption
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DISADVANTAGES
SED may also be susceptible to screen
burn- In.
High production cost
Unknown life expectancy
Currently prototype only
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SEDTV
1 ms response time
Canon and Toshiba Corporation are
jointly working on SED , the new
generation of high-quality large flat-
screen display.
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COMPARISONSED TV v/s CRT TV
SED TV v/s LCD TV
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SED COMPARED TO LCD
LCD's highly directional light, it has a limited angle of
view This will not be an issue for SED's self illuminated
phosphors.LCD does have the advantage of not being susceptible to
burn-in which any device using phosphors will, including
SED.
SED is likely to use about two-thirds the power of asimilarly sized LCD.
LCD generally suffers from the same black level issues
SED is usable in bright room but LCD is not usable
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SED COMPARED TO CRT
A traditional CRT has one electron gun that scans
side to side and from top to bottom
CRTs are typically as wide as they are deep. but
SED need only a few inches of thickness .
Screen size can be made as large as the manufacturer
dares
CRTs can have image challenges around the far
edges of the picture tube, which is a non-issue for
SED
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PRICING
expensive in early production.
If it works, the use of inkjet technology tomake SED displays rather than the more
expensive photolithography process used in
LCD panels should help cost management.
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FUTURE SCOPE
SED will be the next generation display technology
in the nearby future.
SED will enter production and compete with LCDsin all areas
All of the claims made by the backers of SED you
would think that there should be noreason to buy any other type of display.
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CONCLUSION
The SEDs are the combine form of the LCDs and
the CRTs which have the slim factor like a liquid
crystal display and have brighter picture and the
quality like cathode ray tube display.
The SEDs have superior contrast ratios and
viewing angles consume less power and have high
color performance
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REFERENCES
Nanotechnology, IEEE Transactions on
Volume 7, Issue 4, July 2008.
A paper on Nanotechnology, Department ofCommunication
www.canon.com
www.electronics.howstuffworks.comwww.howstuffworks.com
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