Change of Focus for Liquid Crystals

Dylan Knight Rogers writes to tell us PhysicsWeb is reporting that US physicists have discovered a new liquid-crystal lens design that can alter the focus by varying the voltage applied. From the article: "The new lens, which has been built by Shin-Tson Wu and colleagues at the University of Central Florida, allows the focus to be changed in a new way. The device consists of a mixture of liquid-crystal molecules and smaller N-vinylpyrrollidone monomers placed between two glass substrates, each of which is coated with a thin transparent layer of conducting indium tin oxide. They then placed a concave glass lens with a flat base on top of one of the substrates."

Re:Neat.

[Who235]

I don't know about that one. I think I'll stick with glasses until they can make the LCDs (and power supplies) small enough to _not_ make me look any more like a frog than I already do.

I think a more realistic use would be for weapon sights and cameras.

Re:Not for monitors just yet

[From A Far Away Land]

"It's you that focuses your eyes on them, not them that need to focus on you."
In Soviet Russia, LCDs focus on you?

Seriously though:
Would there be no application to use LC Lenses in conjunction with a current LCD monitors to create a screen with depth through the use of lense trickery? I don't know oodles about optics or 3D technology, so maybe I misunderstand how it would work, but it seems to me that these changable lenses might be capable of providing a 3D monitor that doesn't require polarized glasses or some other filter.

Isn't that an old story?

[rduke15]

I remember reading 1 or more years ago (here on /. ?) a very similar story about a new lens. It was thought to be used in mobile phones and such, being a very small lens, with no moving parts, focusing being only done through the voltage applied.

Would someone still have a link to that old story?

Re:Isn't that an old story?

[flobberchops]

Fluid Lenses. http://www.palminfocenter.com/news/6605/new-liquid -lens-digital-camera-tech/ [palminfocenter.com]

Doesn't it sound similar?

[Anonymous Coward]

http://www.research.philips.com/technologies/light _dev_microsys/fluidfocus/index.html [philips.com]

Video of this lens working
mms://ntstream2.ddns.ehv.campus.philips.com/efi/86 090/fluid_focus/fluid_focus.wmv

Philips' FluidFocus system mimics the action of the human eye using a fluid lens that alters its focal length by changing its shape.

Re:Isn't that an old story?

[Volanin]

Are you talking about this [slashdot.org] or this [slashdot.org]? ;-)

Novel invention, novel uses

[xkr]

I doubt this system will replace mechanically focusing a camera lens.

However, this might be used as a way to optimize solar panels as the sun moves across the sky, or to change the field pattern for headlights or taillights to better match current driving conditions.

Re:Battery life...

[Dis*abstraction]

Using two lenses with adaptable focus, you'd be able to zoom without needing to change the barrel length, if my understanding is correct. This would simplify the mechanical requirements for variable focus and optical zoom to the point where it would make sense to include both features in consumer electronics.

Also, there's nothing stopping a professional photographer or cinematographer from putting film behind that felxible lens. Being able to ditch that truck full of heavy glass optics would be a great boon for professionals.

Stereo 3D with Focal Depth.. & healthier eyes

[gruthen]

Sharp have an LCD screen [sharpsystems.com] which can deliver a different image to each eye. These screens allow each eye to see alternate columns of pixels. Combine this (or any other stereoscopic system) with the Liquid Crystal Lense and you'd have a very convincing 3D effect. LCL could also have Occ Health & Safety benefits. Your eyes could be exercised by each window having a different focal depth. Fitter eyes = less need for glasses.

Re:Neat.

[Anonymous Coward]

Screw that, imagine these being used on a monitor, in front of individual pixels, or perhaps groups of pixels... You could emulate depth of field in hardware by playing with how the brain interpets focus!