SED? Mini review.

[overlord]

http://www.behardware.com/articles/593-1/close-encounters-of-the-third-kind-sed.html

[neilmcl]

This has already been posted and discussed many times.

[overlord]

This has already been posted and discussed many times.

Apology to original poster.

I should've used search tool before posting.

[Dave163]

SED sounds just wonderful - all the advantages of CRT with none of the disadvantages of plasma.

Or does it?

How does a electrode-phosphor-dot technology avoid screenburn? And how does a pixellated screen avoid dead pixels? Sort out those issues and I might buy one.....

Dave

[Nic Rhodes]

are they not sorted then? what have you seen?

[welwynnick]

Anything with phosphors must be prone to screenburn or image retention.

But SED is presumably a progressive display that is not scanned like a CRT. Each pixel can be illuminated continuously, rather than once per frame, so presumably does not have to get driven so hard.

I'm making it up as I go along, but it suggests to me that SB won't be a great problem.

Nick

[SimonO]

...not scanned like a CRT...I think they are scanned like a CRT...

[welwynnick]

I've read all the material I can find on SED, but not come up with much evidence, so I pretty much made a broad assumption. We've had the discussion before with regard to plasmas, but it was never really resolved. I think it will be a long time we can get a definitive answer on SED, but I would really like to know what it is!

There is another way of looking at it, though. If screen burn was a problem with SED, then a compromise in it's performance would be clearly evident, and the maximum brightness would have to be kept low. But I don't believe that is the case.

Nick

[Nic Rhodes]

I thought we presumed innocence until proven guilty? We need real practical info here, there is little point in speculating on what might be especially when there is NO evidence for it anyway.

I heard they had rainbows,.....;)

[welwynnick]

I heard they needed to be liquid coupled ......

[NicolasB]

SED screens will inevitably be subject to screen burn - that's unavoidable in anything that uses phosphors. A more interesting question is whether or not they will be vulnerable to magnetic fields - I would assume they will be.

I wonder if it would be worth making a 3-SED front projection system...?

[Stephen Neal]

SED screens will inevitably be subject to screen burn - that's unavoidable in anything that uses phosphors. A more interesting question is whether or not they will be vulnerable to magnetic fields - I would assume they will be.

I wonder if it would be worth making a 3-SED front projection system...?

I suspect there would be brightness issues - currently.

[Dave911]

The screenburn issue makes me laugh really :rotfl:
All types of display (to my knowledge) will suffer from screenburn eventually, CRT, LCD and plasma certainly do - to think that as if by magic Toshiba are suddenly going to overcome this problem is probably quite narrow minded.
I am sure that over time the new SED will have the same problem - the only difference with all of the types of display is how long this takes to happen, lets hope in the case of SED that it is a very long one

[Nic Rhodes]

I don't think Toshiba ever claimed that this would not be there, it is probably ineveitable given the base of the technology used. However there are HUGE variations in how this effects devices, and is from different causes for different display technologies. For many types if is now often not an issue for customers, for others it is a deal killer.

What we have here is a new display technology that has barely had a public outing yet. We do not really know it's strengths and weaknesses yet. It is ALL speculation, driven by the comapny itself (strengths) or wild guesses (weaknesses). This 'information' will come when the devices are actually launched. I think it is unwise to talk about 'faults' on devices, like screen burn, when we literally know nothing about them or this issue wrt SEDs.

[Dave911]

I don't think Toshiba ever claimed that this would not be there, it is probably ineveitable given the base of the technology used. However there are HUGE variations in how this effects devices, and is from different causes for different display technologies. For many types if is now often not an issue for customers, for others it is a deal killer.

What we have here is a new display technology that has barely had a public outing yet. We do not really know it's strengths and weaknesses yet. It is ALL speculation, driven by the comapny itself (strengths) or wild guesses (weaknesses). This 'information' will come when the devices are actually launched. I think it is unwise to talk about 'faults' on devices, like screen burn, when we literally know nothing about them or this issue wrt SEDs.

Nic
You are absolutely right - everyone is jumping the gun here - I never said that Tosh said it would not, but people appear to be thinking that it will not, or that it will be better than others. What my point is that all forms of TV display will suffer from screenburn which you have echoed -whether the Tosh will be better is only for time to tell.
Anyway I like to speculate - it helps you accumulate :grin:

[Nic Rhodes]

As a technolgy I think it looks strong.

[NicolasB]

The screenburn issue makes me laugh really :rotfl:
All types of display (to my knowledge) will suffer from screenburn eventually, CRT, LCD and plasma certainly do Too bad your knowledge is so limited, then.

Screen-burn is something that happens to phosphor displays. CRT and plasma burn, so will SED. LCD doesn't burn. DLP doesn't burn. LCOS/SXRD/DILA do not burn. OLED will not burn.

[Dave911]

Too bad your knowledge is so limited, then.

Screen-burn is something that happens to phosphor displays. CRT and plasma burn, so will SED. LCD doesn't burn. DLP doesn't burn. LCOS/SXRD/DILA do not burn. OLED will not burn.

Whoa am I a dumb :eek: then
I bow to your greater knowledge!!!

:oops: :oops: :oops: :oops: :oops: :suicide: :suicide: :suicide:

[welwynnick]

Screen-burn is something that happens to phosphor displays. CRT and plasma burn, so will SED. LCD doesn't burn. DLP doesn't burn. LCOS/SXRD/DILA do not burn. OLED will not burn.There is anecdotal evidence that LCDs burn. Everyone says they shouldn't, and maybe it's not actually the display, but I've heard that they do.

[Stephen Neal]

There is anecdotal evidence that LCDs burn. Everyone says they shouldn't, and maybe it's not actually the display, but I've heard that they do.

It may not be classed as screen burn, but I have seen a number of LCDs with fixed "burned in" patterns that have not faded with time.

[Mad_darren]

I think there may be confusion between the symptoms of either screen-burn or image retention. As has been discussed, a phosphor matrix is susceptible to a chemical change if electron excitation is sustained - possibly to an irreversible degree.

I have noticed on my widescreen LCD monitor that after a three weeks of use, the OS X (Apple OS) dock has etched a dark line where it meets the blue of the background! It has taken a week of hiding the dock and allowing a screen-saver to swirl a changing high contrast image to fade it out! This is an example of image retention NOT screen burn.

Image retention is caused by migration of charged carriers in the display from one electrode to another which only happens under the influence of a DC bias. As these ionic contaminants migrate to the surface, the electric field is lowered where they are deposited, a causing the total field applied across liquid crystal display to be reduced in those regions. This exhibits itself as less drive in that region and a burned-in image

[Nic Rhodes]

Which is why my original post was so worded. :hiya: Though technically inaccurate many issues now get badged under a generic term of 'screen burn'.

I don't think Toshiba ever claimed that this would not be there, it is probably ineveitable given the base of the technology used. However there are HUGE variations in how this effects devices, and is from different causes for different display technologies.