Canon and Toshiba Demonstrate SED TVs

Canon and Toshiba have been working on yet another display technology called SED (Surface-conduction Electron-emitter Display). The goal of SED is to bring some of the good qualities of CRT displays (response time, brightness, black levels) to a fixed pixel, very thin, low power display.

The technology works very similarly to older CRT displays, except on a much smaller scale. In a CRT display a Cathode Ray Tube (CRT) would shoot electrons at phosphors behind the viewing glass to effectively paint the picture you see on your monitor. In a SED display, individual electron emitters shoot electrons on phosphors behind the viewing screen to create the pixels on your screen.


CRT vs. SED - provided by Canon Technology


How SED Works - provided by Canon Technology

Since a large CRT isn't necessary, SED TVs can be several centimeters thick rather than tens of inches. But with the response time, brightness, color reproduction and black levels comparable to CRT displays, SED technology has the potential to be the best of both worlds.

Like LCD and DLP technologies, SED displays are fixed pixel displays and there are three electron emitters per pixel. The downside to a fixed pixel display of course is that you end up sacrificing quality if you display content isn't at the same resolution as the native resolution of your display. In other words, there should be a 1:1 mapping of content pixels to each group of RGB electron emitters to obtain the absolute best image quality. However, as hardware scalers become more and more powerful the 1:1 pixel mapping problem becomes less important.

About six years ago Canon and Toshiba started working on developing SED technology for consumer TVs, and they are supposed to start shipping the first SED panels later this year. At the show both companies had demos of SED TVs (they looked to be around 30" diagonally). The conditions weren't perfect to truly evaluate the technology since they were in extremely dark rooms and with no other displays available for direct comparison. That being said, the image produced looked very nice. With no other types of TVs in the room we can't really say how it compared to LCD or Plasma TVs (SED's closest competitors), but it did look very good.

One thing we did notice was that the displays looked like they had extremely low refresh rates. You could see the screen refreshing much like a CRT set to 60Hz. Granted the technology is still pre-production so that could explain the issue.


The dark bar across the screen is our camera capturing the visible refresh rate on the display

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  • quanta - Friday, January 13, 2006 - link

    From page 8:

    quote:

    Like LCD and DLP technologies, SED displays are fixed pixel displays and there are three electron emitters per pixel. The downside to a fixed pixel display of course is that you end up sacrificing quality if you display content isn't at the same resolution as the native resolution of your display.


    Actually, that only exist if at least 1 dimension of display content dimensions isn't integer divisor of display's native resolution. Secondly, DLP can overcome this by shining at only the biggest subset of mirror in the DMDs that do not cause distortions, then use adjustable sets of lenses to perform zooming, with each set zooming at only 1 axis.
    Reply
  • Kensei - Monday, January 09, 2006 - link

    Please do a review of this thing when it becomes available. I'd love to see how its output compares to Blu-ray and HD-DVD. I'm sure it's not as good... but just how much worse is what I'd like to know. Reply
  • highlandsun - Thursday, January 12, 2006 - link

    Samsung has pretty good scaling technology, but it seems to me this is something you only need in your display. (And Samsung TVs do pretty good upconversion already.) So, kind of silly. Reply
  • VooDooAddict - Monday, January 09, 2006 - link

    Raptor X.

    I feel so guilty. I'm drooling over a hard drive that costs more then a 7800GT.

    I've wanted a windowed Hard drive for ages though... but don't have the dremmel skills nessesary to add a window to an existing drive.
    Reply
  • Questar - Monday, January 09, 2006 - link

    Nobody has the dremel skills. Drives are assembled in clean rooms. Beaking the seal will be the end of a drive. Reply
  • Clauzii - Monday, January 09, 2006 - link

    I´ve seen a drive approx. a year ago on the net - modded with blue light - woring - 20Gig. Damn where was it....? Reply
  • Clauzii - Monday, January 09, 2006 - link

    But also found this .. it´s nothing new ....... Reply
  • Clauzii - Monday, January 09, 2006 - link

    This: http://www.halfbakery.com/idea/Transparent_20disk_...">http://www.halfbakery.com/idea/Transparent_20disk_... Reply
  • Clauzii - Monday, January 09, 2006 - link

    woring = working...
    Reply
  • Eris23007 - Monday, January 09, 2006 - link


    I've noticed lately that article text seems to disappear a few seconds after page load, frequently when one of the sidebar ads appears. Can't be retrieved except by highlighting it, moving the page back and forth (so it redraws), etc. Happened on a number of articles over the past week or so...

    IE6/XP-SP2
    Reply

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