AA SEMINAR SEMINAR ONON

SURFACE- CONDUCTIONSURFACE- CONDUCTION ELECTRON-EMITTERELECTRON-EMITTER DISPLAYDISPLAY (S.E.D.)(S.E.D.)

Submitted To :- Submitted By:-Mr. KAUSHAR ALI MANISH KR. SHARMADep. of electronics Roll no. – 4 EC 42

Surface-conduction Electron-emitter Display (SED) is a new type of flat-panel display technology that utilizes the collision of electrons against a phosphor-coated screen to emit light similar to a cathode ray tube but, instead of having one electron beam hitting the whole screen, each pixel has its own emitter. It’s like every pixel of a SED display is a miniature CRT, resulting in a discrete arrangement that will allow SED screens to behave like a digital display

SED has all the advantages of cathode ray tube (brightness and contrast levels, viewing angle) and none of the drawbacks of current flat panel display technologies.

INTRODUCTION

Surface-Conduction Electron-Emitter Display Surface-Conduction Electron-Emitter Display (SED)(SED)

SEDs work on the same principle as CRTs◦ One side of a glass is covered in phosphor that lights up when

hit by electrons◦ Electrons are fired at the phosphor to create the picture

However, where CRTs use one electron gun for the whole screen, SEDs use an electron emitter for each pixel

A SED is an array of Surface-Conduction Electron-Emitters (SCEs), each of which has a separate emitter for RGB

Colored Phosphor

Glass

Glass

Electron Emitters

Electrons

Surface-Conduction Electron-Emitter (SCE) SED

WORKING OF SED WORKING OF SED TECHNOLOGYTECHNOLOGY

CREATING THE PICTURE:-

SED is a display device includes an electron-emitting device which is a

laminate of an insulating layer and a pair of opposing electrodes formed on a planar substrate. A portion of the insulating layer is between the electrodes and contains fine particles of an electron emitting substance, that portion acting as an electron emitting region. Electrons are emitted from the electron emission region by applying a voltage to the electrodes, thereby stimulating a phosphorous to emit light .

A set has three SCEs for every pixel -- one each for Red, Green and Blue. A widescreen, high-definition set can have more than 6 million SCEs. An SED-TV has millions of these SCEs arranged in a matrix, and each one controls the Red, Green or Blue aspect of one pixel of the picture. Rather than directing electrons to create the image one row at a time, the matrix activates all the SCEs needed to create the picture virtually simultaneously .

A VIEW OF SED TECHNOLOGY

Advantages Thin when compared to CRTs; approximately the same

width as LCDs Higher contrast ratio and better viewing angle than

LCDs [6]

Faster response time than LCDs Comparable power consumption to LCDs

Disadvantages Phosphor screens are subject to “burn-in” Due to ongoing patent litigation, not currently mass-

produced

1. Contrast ratio 50,000:1. Toshiba's final versions of SEDs will have a

contrast ratio of 100,000:1. 2. Response time 0.2 milliseconds. 3. Brightness of 450 cd/m2 . 4. 180º Viewing angle. 5. Viewable in Bright room. 6. It can be used in Mobile device display. 7. Low power consumption. 8. Longer life expectancy.

Future Market ShareFuture Market Share

SEDWill enter production and compete with LCDs in all areas

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[2] Samsung SDI, OLED - Passive Matrix (PM), http://www.samsungsdi.com/contents/en/product/oled/type01.html , retrieved on July 28 2007

[3] http://electronics.howstuffworks.com/oled1.htm [4] Comiskey, B.; Albert, J. D.; Yoshizawa, H.; Jacobson, J. "An

electrophoretic ink for all-printed reflective electronic displays" Nature 1998, 394, (6690), 253-255.

[5] http://www.eink.com/products/matrix/High_Res.html [6] http://entertainment.howstuffworks.com/sed-tv2.htm [7] http://electronics.howstuffworks.com/plasma-

display1.htm [8] http://electronics.howstuffworks.com/dlp1.htm [9] http://www.dlp.com/