3D Eyewear Close Up - Modern Polarized Active & Passive Technology.

Polarized 3D glasses create the illusion of three-dimensional images by restricting the light that reaches each eye. To present a stereoscopic motion picture, two images are projected superimposed onto the same screen through polarizing filters as each filter passes only that light which is similarly polarized and blocks the orthogonally polarized light. Each eye sees only its separately polarized image, and that produces a three dimensional effect. Or many of the other concept emerging on to the market day by day. 

There are five separate version of Digital 3D cinema projection systems are currently being used in cinema’s each has positives and negatives in set up and return on investment. The biggest draw back that audiences will notice is that each system uses different technology in the glasses. However the most popular system is the RealD system, which is the most cost effective for cinema owners that have to replace old analogue projectors and install next generation digital projectors and screens.

There are three version of lens that the audience are currently given to wear during the movie.

Linear Polarized

Linear polarized glasses have two polarizing lenses, which have their polarization directions at opposing angles (90° apart). By adding the same polarized lenses in front 2 projectors or lasers the left eye sees the left image but the right eye sees this as black whereas the right eye sees the right image and blacks out the left image. Finally our brain does the rest and merges the two images together to display what we are watching in 3D. Cinema’s like Imax and Theme Park rides uses this format.

Circularly Polarized

Circularly polarized glasses work by allowing light that is left circularly polarized is extinguished by the right-handed analyzer; while right-circularly polarized light is extinguished by the left-handed analyzer. The result is similar to that of stereoscopic viewing using linearly polarized glasses; except the viewer can tilt his head and still maintain left/right separation. Over 50 percent of mainstream cinemas around the world use the RealD projection system that requires Circularly polarized lens to watch a film.

ACTIVE Polarized Glasses

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 3D movie with active glasses virtually eliminate ghosting, but the glasses are expensive and need to be cleaned after every use.

3D Eyewear Close Up - Classic Anaglyph Technology.

Likewise the traditional old fashion Anaglyph system used at home on the television to watch DVD’s has had a modern make over with new colour lens that allow greater colour saturation These systems integrated cutting edge technology.

Anaglyph images have seen a recent resurgence due to the presentation of images and video on the Internet, Blu-Ray HD disks, CDs, and even in print. Low cost paper frames or plastic-framed glasses hold accurate color filters that typically, after 2002 make use of all 3 primary colors. The current norm is red for one channel (usually the left) and a combination of both blue and green in the other filter. That equal combination is called cyan in technical circles, or blue-green. The cheaper filter material used in the monochromatic past, dictated red and blue for convenience and cost. There is a material improvement of full color images, with the cyan filter, especially for accurate skin tones.