Talk:Surface-conduction electron-emitter display

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Contents 1 Foreign links 2 Non-native Resolution 3 Light Guns 4 Electron Dynamics 5 What year did Canon begin SED research? 6 Drawbacks 7 Bad grammar? 8 Carbon nanotubes

[edit] Foreign links

Are we supposed to be linking to non-english websites? →James Kidd (contr/talk/email) 02:15, 14 January 2007 (UTC)

See Wikipedia:External_links/workshop#Foreign_language_links and Wikipedia:Manual_of_Style_(links)#Non-English-language_sites

--195.137.93.171 18:07, 2 December 2007 (UTC)

[edit] Non-native Resolution

This statement makes no sense to me: "The market for SEDs as monitors is unlikely, as SEDs have very poor picture quality outside of their native resolution."

How is that any different than LCD monitors? Doesn't the image quality of a non-native resolution for any fixed pixel technology have everything to do with the scaling/processing technology, and nothing to do with the display itself? And aren't LCD monitors exploding in the computer display market, even though they have this very problem?

How though? I thought they worked more like CRT... CRT does not have a problem with native/non-native resolutions. Why should SED? Surley it'd just be a mattter of setting the resolution for each of the emitters?

You (last poster) obviously haven't read about the working principles of the SEDs. SEDs have a separete electronic gun for every pixel/subpixel, meaning they have a native resolution just like LCDs. But, just like LCDs, they can be scaled to any resolution, with minor loss of image quality. Tani unit 01:40, 12 June 2006 (UTC)

With a CRT, the electrons from each RGB colour-channel could, in principle, be focussed to smaller or larger spots than the phosphor dots, but the dots and mask-hole sizes are matched, so doubt if this has been done commercially. There isn't a 'focus' pin on a VGA connector ! I think CRTs are not really different from LCDs in the sub-R+G+B-dot addressing state. Now ClearType sub-pixel addressing is another matter - it should give LCDs an advantage at native resolution, although some people prefer CRTs with ClearType, too ! --195.137.93.171 18:16, 2 December 2007 (UTC)

I have a question which this article doesn't answer: Do SED pixels have to be dithered, or can the element statically display any level of brightness, while its neighbors are displaying completely different levels of brightness? One disadvantage plasma displays have over CRTs is that the plasma pixel can only be on or off. This means that the intermediate intensities are dithered, and there can be artifacts when the viewer's eye tracks a moving object that has to be dithered. DLP pixels also have this limitation, because the micro-mirrors can only reflect or not reflect the lamp onto the screen.

I read of a stadium-sized display which used individual CRT's as pixels. I think editting the article to make a comparison between SED and this type of stadium display would improve the article. I don't know enough about the SED to get that right though.

Electrons crossing a nano-gap at 10 volts probably won't give a great deal of stable control over the current. 8 bits = 256 levels of brightness per pixel is the usual standard. The control mechanism is Quantum tunnelling which is very non-linear so they may well use Pulse-width modulation. --195.137.93.171 19:48, 2 December 2007 (UTC)

[edit] Light Guns

JR: One of the last sentences also says something about light guns. I don't think the phosphor coating has anything to do with the possibility of using light guns in connection with the display.

--128.255.179.98 05:12, 24 July 2006 (UTC)

[edit] Electron Dynamics

This sentence is very confusing: "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..." --128.255.179.98 05:12, 24 July 2006 (UTC)

Maybe the 'Technology' section should be merged with the intro ? Or just link to Electron gun instead? Big difference is that CRT uses Thermionic emission - the electrons 'boil off' a heated filament, whereas SED might be emitting from a cold surface. FEDs emit due to a high electric field around points. It seems SEDs use a different mechanism - move that up from 2nd External Link "Canon Technology SED showcase" to be another Reference?. Might be best not to speculate ? --195.137.93.171 19:14, 2 December 2007 (UTC)

[edit] What year did Canon begin SED research?

The "Technology" section says "The technology has been in development since 1987".
Just below this, the "History" section says "Canon began SED research in 1986".
Can anyone clear this up? I don't want to correct these to "in the late 1980's".
Also, while I'm here, surely giving specifications for one demoed display as advantages for the whole technology is a little incongruous?
The specs can stay, but generalisations about the whole technology can't be made on one display.
hinges 15:00, 16 February 2007 (UTC)

[edit] Drawbacks

There was a drawback listed, "May be expensive when first released in 2007". This seemed not unreasonable but speculative, so I replaced it with, "Pricing is unknown although, "Canon CEO Fujio Mitarai says he wants to offer the screens for about the same price as LCD and plasma TVs of comparable size."" which is more factual and informative. BillMcGonigle 14:52, 27 November 2006 (UTC)

[edit] Bad grammar?

Perhaps this is lacking in flow:

"Not enough information about technology. May be expensive when first released in 2007."

Maybe that should be elaborated on, as in "There is not much information available about this technology." And even with that statement, not much information about a technology is certainly not a disadvantage, in respect to a reason not to use it over other technologies. Maybe it is a disadvantage for wikipedians, but if waiting for new display technology and choosing something, if someone told me I shouldn't go for a technology because the public isn't in the know, I'd look at them funny.

There has to be info. out there, there is an article in the Nov 2006 issue of IEEE Spectrum making mention of details of this technology. 68.81.198.36 02:59, 4 November 2006 (UTC) anon

[edit] Carbon nanotubes

The Nano-Proprietary Lawsuit section mentions carbon nanotubes. Does this display type use carbon nanotubes? Shouldn't that be stated in the description? Or somewhere? The Technology section, for example? 81.6.242.110 14:51, 19 July 2007 (UTC)