Stretching Crystals Promise Bendy, Full-Color Displays 117
NewScientist is reporting that a new approach to crystal formation could help create power-efficient, flexible color displays. These new photonic crystals, structured similar to opals, can be tuned by adjusting the gaps between the crystals. "The beauty of the device is that it can produce the whole spectrum of colors, even ultraviolet and infrared light, using only incident light. As a result, the expensive color filters used in every other color display on the market today, are no longer needed. And because the displays use only reflected ambient light, no power is wasted on back-lighting, as in today's mobile phones, for example. 'They can be viewed just as well in bright sunlight as in indoor light,' team member André Arsenault of the University of Toronto told New Scientist."
Ha! (Score:1)
Re:Ha! (Score:5, Insightful)
(BTW, does anyone know how to post a comment to an article using the new discussion system?)
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Re:Ha! (Score:5, Funny)
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my Windows box at work is "locked down" (i also work for Govt - paranoid, sissy wankers) and Firefox does a good job of installing itself and running despite supposed controls. just make sure you change the install folder to something you can write to - try "My Documents" if all else fails
btw, my condolences re: your employer ;^)
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But you see, we can't just create any color we want using only one wavelength. That's why all the color spaces seem to need at least three parameters: RGB, CMY, Lab, HSV, etc.
For example, say you can pick any single wavelength you want, and you pick, oh, that bright "green laser" green #00FF00. How do you make it less saturated? How can it be a shade like celadon #FEFFFE (green but damn near white) or a shade like canned spinach #112211 (green but pretty dark)? Maybe you think you can do it by atten
Re:Ha! (Score:4, Informative)
To accurately represent any given colour, you need an infinite number of values, not just three, since a colour is the sum of an arbitrary number of wavelengths of light. The red cones in our eyes, for example, detect light at around 580nm. If a photon with a wavelength of 590nm hits the red cone, then it is perceived as being a slightly weaker 580nm signal, rather than a different colour. This lets us fool our eyes into thinking they are seeing the full range of colours when they are only seeing three in a different wavelengths with different amplitudes. A species which saw colours properly would find it much harder to design a colour display.
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Like Cows (or, I think, hooved animals in general). See either this week's episode of Mythbusters, or this paper, Principles of Cow Comfort, Animal Handling, and Movement [psu.edu]:
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Maybe it could sell to the audio/videophile crowd but it's biologically unnecessary to use more than three primaries. Our retinas have only three kinds of cone cells - roughly red, green and blue. Apparently some people have a fourth type of cone cell but it's extremely rare.
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Also, browns require more than one color to be displayed (although presumably one can dither).
The only problem I can see with this material is that one color will require the shortest distance between crystals, and another will require the longest distance (Red vs. Indigo). When displaying all of one color on a billboard display, will the difference in size actually rip the display out of the frame?
Re:Ha! (Score:4, Insightful)
(Black), Red, Orange, Yellow, Green, Blue, Indigo, Violet, (Black)
To generate a white reflection (or non-spectral colors, like brown), adjacent pixels would still have to do what we do in modern displays: one would be Red, the other Blue, the other Green, and your eye would see reflected white light. So in a certain sense it has the same pixel-clustering limitation of current displays.
However it's better than current displays in some ways. First of all, if your image happens to be monochromatic (or parts of the display are monochromatic) then you don't have to be using three display pixels for a single image pixel... so in essence you can triple your display resolution. No doubt if such displays become common, algorithms will be developed that allow the display to maximize resolution when possible.
Perhaps more importantly, however, is that the color range is greater. A typical display mixes Red, Green and Blue. But the wavelength of the Red, Green, and Blue that are available are inherently limited. This means that although the display can generate many colors, it doesn't actually cover the full color range of colors that your eye can see. With this proposed display, you can adjust the Red, Green, and Blue wavelengths themselves. This provides access to a wider color range. For instance, when this display sets itself to 'orange' it will be a pure spectral orange, rather than an approximation generated by mixing the right amount of red, green, and blue.
And, of course, an obvious advantage is that this system is reflection-mode. Like paper, it doesn't generate light, merely reflects ambient light. This makes it ideal for reading outdoors, in natural light, etc.
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Talk about getting things backward (Score:2)
This problem is nothing new, did you know that when they first introduced the 4 color cga monitors (well 16) they had to rescan all the porn from the green/amber version into the new 16 color format?
There was even a time in the VGA era when you had black&white monitors (I had one), every porn website I visited I had to append B&W to the url (?monitorowner=cheapbastard), so I would get the black&white scans and not the colors ones. Once I forgot and my monitor blew up.
What are you? STUPID?
What
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More like print (Score:3, Informative)
I posted a comment to slashdot more than ten years ago about the potential of passive displays that only reflect ambient light, suggesting that there would be potential for display development. Glad to see my prog
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I actually did some research [tejat.net] into this.
The reason no image format directly supports HSV or HSL is that in order to have a decent perceptual precision you have to have a LOT of actual precision. (8+8+8 bits is not enough.) In addition, if you lossily compress the H, S, and V/L channels separately, the result looks worse than for YCbCr, or even RGB.
-:sigma.SB
Uhh... (Score:5, Funny)
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However the reflection effectively acts like an absorption if viewed transmissively. So if you had a backlight, you could tune the effective absorption band of each individual pixel. By cutting out a band of colors (and using adjacent pixels), you effectively have full color control.
So it's possible to imagine a future version of this tech where the display is normally reflective (black backing) but when required switches to emissive display (which would require a backlight turning on, and inverting the logic of the display pixels so that the colors don't come out inverted). Thus you'd have the "best of both worlds."
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Is that an English torch or an American torch?
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That's what I figured, but it's much more fun to visualize the version of torch which relies on highly exothermic chemical reactions :-)
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Its amazing how "PC" we think we are/try to be, but somehow neanderthals still don't get the treatment they deserve.
Sounds like a fire hazard to me... (Score:1)
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woosh (Score:1)
Re:Uhh... (Score:5, Insightful)
From the blurb, this sounds like the holy grail: reflective, full color gamut, and flexible to boot. Of course we all know what happens to 99% of breakthrough technologies that should be ready for the market in 2-4 years...
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Now if they could just make ebooks suck less...
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There are just too many practical situations where it's convenient to be able to see your mobile screen in low-to-no ambient light situations.
meetings/classes with a projector in use
at the pub or theatre
in bed
outside at night
in a car/plane/train at night
etc.
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> at the pub or theatre
> in bed
> outside at night
> in a car/plane/train at night
> etc.
How often in each of those places do you presently use a backlit or emitting display?
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Mind the switching speed (Score:3, Insightful)
So unless you're in the digital billboard industry, there's still alot more than 2-4 years of work to be done before it matters - if ever.
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Frankly, depending on power consumption / size / etc, it does sound like it might be clutch for displaying a book, or photographs, or heck, even maps/GPS would work. Sub-second is fast enough for images that only change very infrequently.
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"Ah. Humor. Ahrrr! Ahrrr!" -- Mork
If you backlit this thing, the display image would be on the back side, doing you as much good as an LCD from the rear.
Another limitation: angle of incidence. The spacing between the little balls makes the colors. The apparent spacing changes as the angle changes. Color straight on would be a different color off center. What makes opals so pretty is that the color changes as it or you move.
Same goes fo
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I didn't miss that at all, though "make" was a poor choice.
It'll reflect different frequencies according to the nodule spacing. It can reflect IR as well as other frequencies, so it can NOT reflect IR, or reflect it at a particular angle according to incide
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Cavemen are people too!
As usual (Score:1, Insightful)
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Having said that, I would like to point out that this design idea is further along than many (most?) of the "display tech of the week" articles we read. In particular, in the actual scientific paper they show working prototype systems with multi-pixel displays. Their devices, while prototypes, have realistic parameters: 0.3 mm
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Dang (Score:2)
Unless we could make suits/coverings out of it that would display a video feed of what's behind you: active camouflage!
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1000 words (Score:3, Informative)
There are none here, although there's no shortage of sales brochure style summaries:
http://www.opalux.com/technologies.php [opalux.com]
Poor product naming... (Score:2, Insightful)
Ela STINK
Sunblock required for computer users (Score:5, Funny)
Sweet, now we can get a virus on our computers that gives us sunburn.
I wonder if Hawaiian Tropic will hire me as a blackhat to ensure they get increased sales from computer users. Maybe they'll introduce me to the girls.
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Yes, then you can try to court the lasses!
LOL, the captcha for this post was "condom".
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It's not emitting UV at you, it's just reflecting ambient UV. If you are outdoors, then some UV from the sun would be reflected off the display. If you take the display indoors, essentially no UV at all would be reflected since most light b
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Not exactly a sunburning virus but a similar concept.
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hmm "infrared light based laptops!" (Score:3, Interesting)
Re:hmm "infrared light based laptops!" (Score:4, Insightful)
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What is it? (Score:2)
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I'm still waiting for an OLED display that's bigger than the screen on my iPod.
How about that projector that could work from a cellphone? (Or even my laptop!)
Best. Idea. Ever. (Score:1)
Two very obvious questions... (Score:2)
1) What is the resolution of the device?
2) What is the power consumption of the device? While I can already see there's no energy wasted on unnecessary back-lighting, how long could such a display be run off of, for example, a typical rechargeable battery?
Slow switching speed... (Score:2)
5. Sub-second switching speed.
So, it might be a while before this is useful for fast-changing displays, like TVs and computer displays.
Might be ok for picture frames, outdoor signage and stuff.
This probably won't be used for monitors (Score:2)
Great, but now... (Score:4, Insightful)
Which brings me to...how does this work with fluorescent lighting? If you're using partial reflectivity, human eyes get the proper fractions of the constituents of the phosphors. If you're using interferometry, wouldn't you end up with huge dropouts in the visible spectrum?
Is this the last we'll hear of it??? (Score:5, Insightful)
There are a billion and one news sites out there, each reporting thousands of 'just in' stories each day. To have just one that actually tracks the progress of each technology would be amazing. Give each tech their own special page, and then add to them as further news comes in about the SAME tech. Perhaps add a progress bar in the form of a percentage of expected market release too. Pretty please? I'm just getting sick and tired of hearing about these amazing new futuristic gadgets, and then never hearing about them again.
http://blog.modernmechanix.com/ (Score:3, Interesting)
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Two years == vaporware (Score:3, Interesting)
Wow. (Score:2)
I want my Predator suit! (Score:1)
Wouldn't surprise me at all if the US military already has a whole team of researchers working on this.
In the pale moonlight... (Score:2)
So if you use it outside on a moonlit night, is it greyscale?
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Elves and gnomes everywhere rejoice! (Score:2)
Sub-second response time not fatal (Score:2)
Small World (Score:1)
sounds like an improvement to me... (Score:1)