3-D technology has traveled a long and sometimes ugly road. In recent years, red-and-blue glasses and bulky LCD headsets made moving images pop off the screen, but fashion-wise landed somewhere short of fabulous. The Holy Grail has always been true 3-D without extra eyewear, and now several companies are bringing headgear-free 3-D displays to market, for applications ranging from gaming to medical imaging to battlefield simulations. Here's a look at the leading contenders in the race to get us out of flatland.
SHARP ACTIUS RD3D NOTEBOOK
Stage of development: Available now
What it looks like: 3-D pictures appear to float in front of or inside this laptop's 15-inch flat-panel display.
How it works: A switching LCD attached to a normal LCD panel creates a barrier that controls the direction of each pixel's light, aiming it at one eye or the other. 3ality is working on a similar solution that can be applied to CRT monitors.
What it's used for: Videos, games, molecular modeling, computer-aided design. The technology has been sighted on PDAs in Asia.
IO2 TECHNOLOGY HELIODISPLAY
Stage of development: Prototypes available
What it looks like: A 3-D image, from 5 to 150 inches diagonally, seems to float in midair above a
How it works: Heliodisplay agitates air to create a surface upon which it can project a 2-D image. Since the image does not appear on a physical object, the eye interprets it as a 3-D image (although it has only a single viewable side).
What it's used for: Not yet in products but will likely be seen in both home-entertainment and
PERSPECTA SPATIAL 3D SYSTEM
Stage of development: Available now
What it looks like: 3-D models, up to 10 inches in diameter, enclosed in a glass dome.
How it works: One hundred ninety-eight
layers of 2-D images are projected onto a rotating screen at 5,940 frames per second to create depth. The viewer's eye merges the 100 million data points into a 3-D image that can be viewed from all sides.
What it's used for: Medical imaging, air traffic control, battlefield visualization. You can even see plays performed inside it.
BRIEF HISTORY OF 3-D
1838: Charles Wheatstone invents the stereoscope. The device uses two slightly different drawings to create the illusion of three dimensions.
1858: Joseph D'Almeida creates the anaglyphic process, which uses red and blue lenses to make 3-D images.
1859: Mass-marketed handheld stereoscopes become a national obsession. Viewers sell for $1. Pictures for 10 cents.
1922: The first anaglyphic feature film, The Power of Love, debuts, using two projectors to create the effect.
1939: The View-Master, a souped-up stereoscope, goes on sale, featuring seven 3-D images on a single disc.
1947: Hungarian scientist Dennis Gabor develops holography.
1952: A single-projector anaglyphic film, Bwana Devil, premieres, sparking a new 3-D film craze.
1953: Three Dimension Comics
No. 1, the first 3-D comic book, hits newsstands, starring Mighty Mouse.
1960: The laser is invented, allowing scientists to create far better holographic images.
1983: Mastercard is the first to put a hologram on a credit card.
1986: Captain Eo, one of the first films to use LCD shutter glasses to create stunning, true-color 3-D, debuts at Epcot Center in Orlando, Florida.
The incredible innovations, like drone swarms and perpetual flight, bringing aviation into the world of tomorrow. Plus: today's greatest sci-fi writers predict the future, the science behind the summer's biggest blockbusters, a Doctor Who-themed DIY 'bot, the organs you can do without, and much more.