Ppt On "SURFACE CONDUCTION ELECTRON EMITTER"

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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.png


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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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