Contact lenses to get built-in virtual graphics
2009-11-13 0:00

By Vijaysree Venkatraman | NewScientist.com

A contact lens that harvests radio waves to power an LED is paving the way for a new kind of display. The lens is a prototype of a device that could display information beamed from a mobile device.

Realising that display size is increasingly a constraint in mobile devices, Babak Parviz at the University of Washington, in Seattle, hit on the idea of projecting images into the eye from a contact lens.

One of the limitations of current head-up displays is their limited field of view. A contact lens display can have a much wider field of view. "Our hope is to create images that effectively float in front of the user perhaps 50 cm to 1 m away," says Parviz.


The lens uses nanoscale and microscale electronic technology and is powered remotely by harvesting radio waves(Image: Babak Parviz/University of Washington)

His research involves embedding nanoscale and microscale electronic devices in substrates like paper or plastic. He also wears contact lenses. "It was a matter of putting the two together," he says.

Fitting a contact lens with circuitry is challenging. The polymer cannot withstand the temperatures or chemicals used in large-scale microfabrication, Parviz explains. So, some components – the power-harvesting circuitry and the micro light-emitting diode – had to be made separately, encased in a biocompatible material and then placed into crevices carved into the lens.

One obvious problem is powering such a device. The circuitry requires 330 microwatts but doesn't need a battery. Instead, a loop antenna picks up power beamed from a nearby radio source. The team has tested the lens by fitting it to a rabbit.

Parviz says that future versions will be able to harvest power from a user's cell phone, perhaps as it beams information to the lens. They will also have more pixels and an array of microlenses to focus the image so that it appears suspended in front of the wearer's eyes.

Despite the limited space available, each component can be integrated into the lens without obscuring the wearer's view, the researchers claim. As to what kinds of images can be viewed on this screen, the possibilities seem endless. Examples include subtitles when conversing with a foreign-language speaker, directions in unfamiliar territory and captioned photographs. The lens could also serve as a head-up display for pilots or gamers.

Mark Billinghurst, director of the Human Interface Technology Laboratory, in Christchurch, New Zealand, is impressed with the work. "A contact lens that allows virtual graphics to be seamlessly overlaid on the real world could provide a compelling augmented reality experience," he says. This prototype is an important first step in that direction, though it may be years before the lens becomes commercially available, he adds.

The University of Washington team will present their prototype at the Biomedical Circuits and Systems (BioCas 2009) conference at Beijing later this month.

Article from: NewScientist.com



Related Articles
Magnetic contact lenses
Human Interface Technology Lab - Website
Psychic computer that can read people's minds developed
Is Quantum Mechanics Controlling Your Thoughts?
The 'telepathy' chip, turn on the TV using the power of thought
'We'll be able to upload our brains to a computer'
Influencing Human Cognition: US Electromagnetic Weapons and Human Rights
Next-generation toys read brain waves


Latest News from our Front Page

Virginia TV Shooter Said, "Jehovah Spoke To Me That I Should Take Action"
2015-08-28 2:36
What causes a guy to go off the plantation enough so that he would murder in cold blood, two of his former colleagues? Guesses are abounding, such as racial tension, mental illness, psychotropic prescription drugs, narcissism, etc. What about the angle of how a destructive religious cult shaped him in his formative years, so that later in life, he would ...
Invasion into Macedonia from Greece - Border Mayhem
2015-08-28 2:06
Description from video page: These are the desperate scenes at Greece’s border with FYR Macedonia as overwhelmed security forces made sporadic attempts to stem the flow of invaders heading northwards. Riot police set off stun grenades and hit invaders with batons but that did little to stop them passing into FYR Macedonia. Skopje had declared a state of emergency on Thursday (August ...
RamZPaul: TV Reporter Murdered Live On Air
2015-08-28 1:48
Youtube description: The gunman responsible for the live on air shooting of reporter Alison Parker and cameraman Adam Ward said part of his motivation for the attack was Parker making “racist comments.” infowars.com Vid that killer made: (note the actual shooting vid is being censored fast) https://youtu.be/v_AhFxhznPI Jesse Benn advocating "White Wounding: just weeks ago:huffingtonpost.com Source: youtube.com
White House Pushes Race War, Then Blames Guns For Flanagan's "Race War"
2015-08-27 5:04
"You want a race war (expletive)?" Asked shooter The Obama administration is blaming guns for the WBDJ-TV shooting, even though the shooter, Vester Flanagan, was influenced by the White House’s race baiting. The White House has been falsely insinuating that racism is the dominant factor behind numerous events over the past several years, even those that didn’t involve race at all, and ...
How Google Destroyed the Internet
2015-08-27 5:12
The internet was created to resolve a simple problem: in communications networks, any central node through which all messages passed was vulnerable to attack or takeover. To counter this, engineers designed a network where any node would pass messages to other nodes, routing around any damage. Then came commerce and the democratization of the internet. Under this model, frightened sheep flock to ...
More News »