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R_Colin_Johnson
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Re: Display Prototype and Potential Applications?
R_Colin_Johnson   10/23/2013 9:40:42 AM
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Thanks for including the Samsung link--I've been meaning to include them in the discussion--and you're right on both counts: their demo was very impressive, but of course the encapsulation technology will be the critical factor in how soon they can come to market.

stcarmic
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Re: Display Prototype and Potential Applications?
stcarmic   10/23/2013 9:35:16 AM
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I'm surprised that the Samsung YOUM has not popped up here anywhere with all this talk of flexible displays! This video is from Jan 2013, and showcases an absolutely amazing flexible OLED colour display. At the 0:40 mark prepare to be astounded! http://www.youtube.com/watch?v=N3E7fUynrZU . The main problem is of course, the encapsulation. The lifetimes on these are shorter than they will be once we have flexible/stretchable encapsulation. For curved displays they can still use glass, but how many of us want to fit a 72" curved display in our home? http://www.dailytech.com/Samsungs+55inch+Curved+OLED+TV+Ships+for+Only+9000/article33166.htm

 

stcarmic
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Re: Feedback or Silly Putty?
stcarmic   10/22/2013 10:41:35 AM
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Note that this demo is NOT actually an OLED. It's a "LEC" or "LEEC". https://en.wikipedia.org/wiki/Light-emitting_electrochemical_cell  

Pei said it in the article: "The second key development is an OLED architecture that we call light-emitting electrochemical cell [LEC]. The LEC devices use a thin luminescent layer that is actually a mixture of electronic semiconductor and an ionic conductor." These devices are not like traditional colour display pixels; they don't have addressability and they don't have multi-colours (i.e. RGB) so cannot display any reasonable gamut of colour range. So these are essentially lighting panels, and the particular ones shown here are yellow. The light emission comes from the polymer, phenyl substituted poly(para-phenylene vinylene) known as "Super Yellow," (you can purchase it and make your own). Even though they show "pixels", note they are not able to light them individually, and a screen made of these would really resemble something very old! -> https://en.wikipedia.org/wiki/Monochrome_monitor

 

stcarmic
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Re: damage
stcarmic   10/22/2013 10:28:21 AM
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Q.Pei's group is not the only one working on this problem, but they are the biggest and so they get the press. Check out a stretchable oled-type device (LEEC) that works at room temperature published from 2012  http://onlinelibrary.wiley.com/doi/10.1002/adma.v24.20/issuetoc   .

Very rough prototype of a "pixel" stretching can be found here:

 http://www.youtube.com/watch?v=3ENjrtbWGaM

Also this year the same group from Canada published a coating that adds transparent electrical function with great flexibility, AND is very durable! http://pubs.acs.org/doi/abs/10.1021/am402847y

Commercial products are years away of course, but some very interesting research is happening in this field!

docdivakar
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Re: Display Prototype and Potential Applications?
docdivakar   9/30/2013 8:49:24 PM
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@R_Colin_Johnson  Thanks for the follow up. I suppose one can compensate algorithmically any chromatic shift with a corrector.

It seems like the UCLA team is focusing on the right challenge to work on in the encapsulation method.

MP Divakar

R_Colin_Johnson
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Re: Display Prototype and Potential Applications?
R_Colin_Johnson   9/30/2013 5:09:53 PM
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@docdivakar I would be curious to know if there are any optical behavioral shifts with stretch ratios? And does it vary with time?

I believe most of the stretching durability tests were performed on the light panel rather than the display prototype, so no data on optical behavior shifts or time variance properties yet. Also the researchers next concentration is finding an encapsulation method that can stretch as easily as the LEC.

docdivakar
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Re: Display Prototype and Potential Applications?
docdivakar   9/30/2013 3:58:43 PM
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It seems like the technology shows good promise. There are many open  questions for this before product designs can start. I would be curious to know if there are any optical behavioral shifts with stretch ratios? And does it vary with time?

We are witnessing another type of display technology take shape -light-emitting electrochemical cell (LEC)...

MP Divakar

wilber_xbox
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Re: Display Prototype and Potential Applications?
wilber_xbox   9/30/2013 3:05:20 PM
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chanj, i agree that some technologies are faster to integrate in consumer market but other such as 3D LED have failed despite all the hype and maturity. Sometime the price at which the technology is sold is not enough and technology support and peripherial support is more than necessary.

chanj0
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Re: Display Prototype and Potential Applications?
chanj0   9/30/2013 2:20:02 PM
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I can see a lot of applicable area and I do agree that the talk of application may be premature until the technology is commerically viable. Nonetheless, who knows how soon the technology can be commerically viable? I have noticed lately that technology is widely available sooner than before. Just look at OLED itself, the pace is far exceeded that of LCD. The market welcomes small OLED display on mobile device, then large TV.

Being_On_Board
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Re: Display Prototype and Potential Applications?
Being_On_Board   9/30/2013 12:45:23 PM
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I think that until the technology - whatever that maybe - for curved and flexible displays becomes commercially viable the the discussion of which applications will benefit is somewhat premature. Sure, flexible display technology will come at some point in the future...consider that the first LCDs were prototyped 40-50 years ago and perhaps only now have they become ubiquitous.

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