Digital 3-D - There's more to see

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New dimensions in film The stereoscopic era of motion pictures began in the late 1890s when a British film pioneer filed a patent for a 3-D movie process using two projectors. Although many experiments were conducted over the next two decades, it wasn't until September 27, 1922 that the first confirmed 3-D movie, The Power of Love, was shown to a paying audience at the Ambassador Theater in Los Angeles; however, the experience was disappointing due to glare.

Refining the 3-D Movie Process

The first commercial full-color 3-D film, using Polaroid® filters to reduce glare, took place at the 1940s New York World's Fair. This short film, produced and shot by John A. Norling, showed the assembly of a Chrysler automobile. To view the 35 mm film, shown on two interlocked projectors, audience members wore eyewear that allowed the left eye image to be seen only by the left eye and vice versa; this technique reduced glare but did not eliminate it.

Although 3-D presentations have improved over the last 60 years, today all theme parks and IMAX theaters use the same dual-projector setup to show movies shot on film. As a result of using two film projectors, cross-talk or ghosting (caused by small amounts of stray light) may result in headaches in audience members who tip their heads from side-to-side.

100% digital DLP Cinema^® chip for an amazing 3-D picture

Today, DLP Cinema® technology provides the world's only digital 3-D single projector solution for movie theaters and commercial use. By using just one projector to produce a 3-D image, technical problems of yesteryear like cross-talk and ghosting, are virtually eliminated. What movie goers experience is precise, lifelike images in vibrant colors delivered through the millions of microscopic mirrors on the DLP Cinema® chip. The chip acts as a light modulator or reflector, and not as a generator of light, resulting in an amazing 3-D picture.

Experience 3-D Movie Vision There are two ways to view a digital 3-D film through active or passive glasses. Passive glasses are the most common type of eyewear used in today's digital 3-D movie experience. These lightweight glasses are based on a polarization modulator and can be thrown away after watching the movie. Audiences who saw Chicken Little 3-D, Monster House 3-D, or The Nightmare Before Christmas 3-D this year, all wore passive glasses. Transforming movie experiences across the country Today there are more than 700 theaters in the country that offer the digital 3-D experience powered by DLP Cinema® technology. There are more theaters opening every day and more movies being made with the digital 3-D experience in mind.

3-D Eyewear: Close up ACTIVE Active eyewear devices are wireless battery-powered glasses with liquid crystal shutters that are run in synchrony with the video field rate. Synchronization information is communicated to the glasses by means of an infrared (IR) emitter. When the emitter recognizes the vertical blanking synchronization pulse through the computer’s video signal, it broadcasts coded IR pulses to signify when the left eye and right eye images are being displayed. The glasses incorporate an IR detection diode that detects the emitter’s signal and tells the shutters when to close and transmit. Although viewing a 3-D movie with active glasses virtually eliminates ghosting, the glasses are expensive and need to be cleaned after every use. PASSIVE An alternative to active glasses is the passive approach or ZScreen, which is a special kind of liquid crystal polarization modulator and requires theatres to install a silver screen. The ZScreen is placed in front of the DLP Cinema® projector lens(es) like a sheet-polarizing filter. The device changes the characteristic of polarized light and switches between left- and right-handed circularly polarized light at field rate. The advantage of circular polarized light is that audience members may move their heads a lot more before the stereoscopic effect is lost. Passive glasses are made of either cardboard or plastic that cannot be sanitized and therefore are for one time use. Use the theater search panel on the right to find a DLP Cinema® near you. Learn more about DLP Cinema®