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Surface conduction Electron emitter Display
The SED technology has been developing since 1987. The flat panel display technology that employs surface conduction electron emitters for every individual display pixel can be referred to as the Surface-conduction Electron-emitter Display (SED). Though the technology differs, the basic theory that the emitted electrons can excite a phosphor coating on the display panel seems to be the bottom line for both the SED display technology and the traditional cathode ray tube (CRT) televisions.
When bombarded by moderate voltages (tens of volts), the electrons tunnel across a thin slit in the surface conduction electron emitter apparatus. Some of these electrons are then scattered at the receiving pole and are accelerated towards the display surface, between the display panel and the surface conduction electron emitter apparatus, by a large voltage gradient (tens of kV) as these electrons pass the electric poles across the thin slit. These emitted electrons can then excite the phosphor coating on the display panel and the image follows.
The main advantage of SEDs compared with LCDs and CRTs is that it can provide with a best mix of both the technologies. The SED can combine the slim form factor of LCDs with the superior contrast ratios, exceptional response time and can give the better picture quality of the CRTs. The SEDs also provides with more brightness, color performance, viewing angles and also consumes very less power. More over, the SEDs do not require a deflection system for the electron beam, which has in turn helped the manufacturer to create a display design, that is only few inches thick but still light enough to be hung from the wall. All the above properties has consequently helped the manufacturer to enlarge the size of the display panel just by increasing the number of electron emitters relative to the necessary number of pixels required. Canon and Toshiba are the two major companies working on SEDs. The technology is still developing and we can expect further breakthrough on the research.
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Surface-conduction Electron-emitter Display (SED)
Abstract
A Surface-conduction Electron-emitter Display (SED) is a flat panel display technology that uses surface conduction electron emitters for every individual display pixel. The surface conduction electron emitter emits electrons that excite a phosphor coating on the display panel, the same basic concept found in traditional cathode ray tube (CRT) televisions. This means that SEDs can combine the slim form factor of LCDs with the high contrast ratios, refresh rates and overall better picture quality of CRTs and the researches so far claims SED consumes less power than LCD displays. The surface conduction electron emitter apparatus consists of a thin slit across which electrons tunnel when excited by moderate voltages (tens of volts). When the electrons cross electric poles across the thin slit, some are scattered at the receiving pole and are accelerated toward the display surface by a large voltage gradient (tens of kV) between the display panel and the surface conduction electron emitter apparatus. SED displays offer brightness, color performance, and viewing angles on par with CRTs. However, they do not require a deflection system for the electron beam. Engineers as a result can create a display that is just a few inches thick; while still light enough for wall-hanging designs. The manufacturer can enlarge the panel merely by increasing the number of electron emitters relative to the necessary number of pixels. SED technology has been developing since 1987 and Canon and Toshiba are two major companies working on SEDs
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PRESENTED BY,
VIKRAM G
[attachment=14488]
SURFACE CONDUCTION ELECTRON EMITTER DISPLAY
FEATURES
Contrast ratio 50,000:1. Toshiba's final versions of SEDs will have a contrast ratio of 100,000:1.
Response time 0.2 milliseconds.
Brightness of 450 cd/m2.
180 Viewing angle.
Viewable in Bright room.
The SED produces light directly on its front surface.
Provides dynamic color expressions, a sharp picture, and perform faster video response.
It is possible to create screens of more than 40" in size that are only several centimeters thick.
It can be used in Mobile device display.
Low power consumption.
Longer life expectancy.
FUTURE SCOPE
SED will be the next generation display technology in the nearby future.
SED will enter production and compete with LCDs in all areas.
All of the claims made by the backers of SED you would think that there should be no reason to buy any other type of display.
As far as the specs go, this is one hot technology.
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can u give ppt of sed so that i can give seminar in my college i
