Talk:LED printer

Unnamed discussion January 2007

I doubt leds burn out from repeated switching, or at least not nearly as fast as incandescent lights. There is no mechanical stress involved from thermal cycling. — Preceding unsigned comment added by 141.85.37.248 (talk) 14:00, 30 January 2007 (UTC)

If the sources listed had been READ, it would have seen this concern listed in two of the sources Zotel - the Stub Maker 22:28, 30 January 2007 (UTC)

dpi limitation

I wonder about this. If the LEDs can't be packed in at 1200dpi, then maybe they can be packed in at 300dpi and four rows, offset at a 1/4 diameter per row. The hard part would be circuitry to get the four rows pulsing onto the same line of the photoconductor drum. The easy way to do it would be four columns of staggered

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timing signals on the drum. Brewhaha@edmc.net 11:33, 30 March 2007 (UTC)

The real "problem" is that, while lasers require moving parts, LED printers require each LED to have extremely consistent characteristics -- thus at some point it got cheaper to bounce a laser around vs. trying to make increasingly-fine arrays of perfectly consistent LEDs. This is the same problem facing OLED displays -- potentially spotty brightness, but it's almost worse in a "line"-type printer where any inconsistency will cause banding down the page.

I think Brother was demoing a staggered unit (or some such thing) not too long ago, possibly a line-printer inkjet, but there's not much motivation; today, the laser/optical pack is probably the last thing to die in a printer.

If the consistency problem is solved, cheap strips of high-DPI OLED might change the game. You could even make an LCD printer with an even backlight. —Preceding unsigned comment added by 155.212.34.122 (talk) 03:42, 20 August 2008 (UTC)

Some of these problems must have been solved already. I am seeing an increasing number of xerographic printers and Multi-function devices that are based on LED arrays rather than lasers, and these are not entirely limited to low-end machines. Pzavon (talk) 02:39, 21 August 2008 (UTC)

If 1200dpi wasn't reachable, how comes the Oki 430dn has 1200x1200 using LED? 78.43.91.242 (talk) —Preceding undated comment added 20:25, 15 December 2009 (UTC).

How to deal with so many explanations of the same thing?

The xerography, the photocopying article, and the laser printer article all attempt to describe the same processes three different ways. It would be nice if the technical details could be focused somehow into a single article that all the others refer to, rather than duplicating the same data across so many locations, such as is being done with the LED printer article.

I'm not really sure how this should be done. Generally I think the xerography artcle should be the master discussion of the technical processes, with the laser printer article just referring to the specific details of the exposure step, as is currently being done with the LED printer article. I have no idea how to deal with the photocopying article since it seems to be an almost unnecessary duplication of the xerography article.

As a somewhat new editor on here, I don't really be the one to be making such large changes, moving the guts of the laser printer technical discussion to the xerography article. But something should be done..

(This talk article has been copied into the talk for xerography, photocopying, laser printer, and LED printer. If you want to comment I suggest putting your response in the talk for xerography.)

DMahalko 00:19, 19 April 2007 (UTC)

The stuff from about.com about leds switching on/off reducing their lifespan is complete rubbish. All LED displays beyond, say, 10 LEDs, are multiplexed. Multiplexing can reduce lifetime because while a LED is only on for a short period of time, it needs to appear as bright as though it was on all the time. This is not the case in LED printers. Therefore, it shouldn't need to be overdriven, and its lifetime will be longer (because it simply isn't on all the time).

— Preceding unsigned comment added by 87.236.105.23 (talk • contribs) 04:49, July 13, 2007‎

Dear DMahalko

In wiki talk for LED Printers you wrote ;

"All LED displays beyond, say, 10 LEDs, are multiplexed. Multiplexing can reduce lifetime because while a LED is only on for a short period of time, it needs to appear as bright as though it was on all the time. {This is not the case in LED printers.*** }Therefore, it shouldn't need to be overdriven, and its lifetime will be longer (because it simply isn't on all the time)."

I think by mistake you compared LED with LED instead of Laser Printer. Kindly correct it. Kindly elaborate your views whether led printers are better than laser printers? Thanks!

— Preceding unsigned comment added by 116.203.74.71 (talk • contribs) 10:54, April 15, 2015‎

I didn't write that. A previous editor did not sign their comment the same as you didn't sign your comment, and it wasn't corrected. I have corrected the signing for the previous and your comment.-- DMahalko (talk) 22:56, 15 April 2015 (UTC)

Reorganizing LED-related pages

There are 23 different LED-related pages, and I think there should be less than half that many. I've started a discussion on this at Talk:Light-emitting_diode#An_absurd_number_of_articles_involving_light-emitting_diodes; please come and join in. -- Dan Griscom (talk) 03:14, 3 March 2009 (UTC)

Suggestions

Opening Text I have a few suggestions to improve this article, but would prefer to get feedback before making modifications. I think the opening of the article could be expanded.

An LED printer is a type of computer printer. LED technology uses a light-emitting diode array as a light source in the printhead. The LED bar pulse-flashes across the entire page width and creates the image on the print drum or belt as it moves past.

Is "LED Technology" the most appropriate descriptor? It seems too general to me, since that term may encompass many other unrelated products. Perhaps LED Print Technology or LED Imaging Technology?

The article mentions that LEDs are used as the light source but does not elaborate on how this works in the overall print process.

LED bar could be defined perhaps? Is the LED bar the printhead?

LEDs are more efficient and reliable than conventional laser printers, since they have fewer moving parts.

This point does not seem to be substantiated by the references included.

The three most popular core technologies in consumer print devices (excluding press-class devices) are ink jet, laser, and LED. The latter two have almost the same parts: feed mechanisms, an imaging device, a drum or transfer belt, and a fuser component. In establishing "efficiency" or "reliability" it seems more correct to identify the differences of the construction of the imaging device, rather than the entire print device.

Depending on design, LED printers can have faster rates of print than some laser-based designs, and are generally cheaper to manufacture.

Could this possibly be outdated information? I did not find a good aggregate article to point to, but in comparing top speed, LED class printers on the market generally have slower engine speeds than laser class printers.

LED printing was invented by Casio.[1]

While mentioned in the reference article 1 [1], there is very little supporting information in the reference article.

Reference Quality The reference provided [2] has no author, and appears to be more than 7 years out of date. (As of my read date is Jan 2002) --Ideahunter (talk) 03:50, 18 May 2009 (UTC)

Lacking citations

The article as it stands needs citations badly. The article includes a link to an article on an external website concerning OKIDATA products but that external article contradicts the claims about the downside of LED technology made in this page.CecilWard (talk) 09:32, 4 November 2009 (UTC)

s-led aka self-scanning-led printers

New product category that might or might not belong on this page.

Patent application here: https://encrypted.google.com/patents/US5177405

It looks like:

• there's some control electronics and some LEDs
• traditionally, they're fabricated separately
• traditionally, the connection between them is parallel
  • that imposes space and cost constraints, because of having a large number of connections

• there's a trick, where diodes can be arranged in parallel, with sideways connections, so that one at a time turns on, and in doing so it triggers the next one to turn on (aka scanning along the strip)
• there isn't enough control of light output to make a good printer
• if instead, other electronics does the scanning, and is connected in parallel to the leds, and these two are fabricated together, this gets over the problem with large numbers of connections

Any better analysis will need to be done by someone who knows more electronics than I do. ArthurDent006.5 (talk) 01:55, 30 January 2015 (UTC)

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