Stretching Crystals Promise Bendy, Full-Color Displays

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."

Comments

Re:Uhh...

[maino82]

This is a very good point and I think it would be interesting if you integrate a photocell into the devices. When the photocell detects enough ambient light, you can turn the backlight off, but when there is no light, or very low light, you turn the backlight on, or possibly even dim it up and down. This way it can function in varying degrees of ambient light, but can also save a significant amount of energy.

hmm "infrared light based laptops!"

[JustASlashDotGuy]

I wonder if this would allow a soldier to use his laptop in the dead of night, viewing his screen via night-vision goggles? Anyone out there that's ever used night-vision goggles know if this even possible in the slightest?

Two years == vaporware

[mark-t]

Okay, I admit it... I was suckered in at first... I actually thought "woah, what a cool idea!" But then I reread the article and there it was.... "available ... in as little as two years" (emphasis mine). Two years, it seems, is a small enough time to get people hyped up about something, but still far enough away that by the time two years is up most people will have forgotten about it. In other words, it's a great way to get funding for that's for a "product" that nobody will ever see.

Re:Uhh...

[kebes]

I'm not sure that backlighting will work - since this is a reflective technology.

It is indeed a reflective technology... but the non-reflective state is transparent rather than black (in the scientific paper they actual show an image in the off/transparent state). The most obvious way to use such a technology is against a black backing. In the 'off' state the entire display looks black, but you can then adjust pixels to be any bright color you want. By mixing the state of adjacent pixels you can presumably get a white color, or anything else.

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."

http://blog.modernmechanix.com/

[bigtrike]

http://blog.modernmechanix.com/ has quite a few. A lot of them didn't quite make it.

Re:Ha!

[fahrbot-bot]

it is conceivable that a creature with a different evolutionary heritage might only have two wavelength sensors

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:

Cows can see color; however they have dichromatic vision which means they see only a limited spectrum of colors. This makes a cow more sensitive to seeing sudden movement, but means they do not like situations with a high contrast of light and dark.