RealD 3Dis a digitalstereoscopicprojection technology made and sold byRealD.It is currently the most widely used technology for watching3D filmsin theaters.[1]Worldwide, RealD 3D is installed in more than 26,500 auditoriums by approximately 1,200 exhibitors in 72 countries as of June 2015.[2]
 | |
 Two pairs of RealD glasses demonstrating the polarization effect | |
| Type | 3D projection technology |
|---|---|
| Manufacturer | RealD |
| Website | http:// reald |
Technology
editRealD 3D cinema technology is apolarized 3D systemthat usescircularly polarizedlight to producestereoscopic imageprojection. The advantage of circular polarization overlinear polarizationis that viewers are able to tilt their head and look about the theater naturally without seeing double or darkened images.[3]However, as with other systems, any significant head tilt will result in incorrectparallaxand prevent the brain from correctly fusing the stereoscopic images.
The high-resolution,digital cinemagradevideo projectoralternately projects right-eye frames and left-eye frames, switching between them 144 times per second.[3]The projector is either aTexas InstrumentsDigital Light Processingdevice orSony's reflective LCOS (liquid crystal on silicon). A push-pullelectro-opticalliquid crystalmodulator called aZScreenis placed immediately in front of the projector lens to alternately polarize each frame. It circularly polarizes the frames clockwise for the right eye and counter-clockwise for the left eye.[4]The audience wearscircularly polarized glassesthat have oppositelypolarized lensesthat ensures each eye sees only its designated frame. In RealD Cinema, each frame is projected three times to reduce flicker, a system called triple flash. The source video is usually produced at 24 frames per second per eye (total 48 frames/s), which may result in subtleghostingand stuttering on horizontal camera movements. Asilver screenis used to maintain the light polarization upon reflection and to reduce reflection loss to counter some of the significant light loss due to polarization filter absorption. The result is a 3D pictures that seems to extend behind and in front of the screen itself.[5]
See also
editReferences
edit- ^Verrier, Richard (2009-03-26)."3-D technology firm RealD has starring role at movie theaters".Los Angeles Times.Retrieved2011-02-05.
- ^""Jurassic World" In 3D Delivers Approximately 65% Of Universal Pictures Record-Breaking International Opening Weekend ".RealD.Archived fromthe originalon June 22, 2015.RetrievedJune 22,2015.
- ^abCowan, Matt."Real D 3D Theatrical System"(PDF).European Digital Cinema Forum.Retrieved2009-03-28.
- ^"RealD - Visual Technology".RealD - Visual Technology.
- ^Cowan, Matt."Presentations (technical)".RealD Media Room downloadable files.Retrieved2009-03-28.
Further reading
edit- US patent 7477206,"Enhanced ZScreen modulator techniques", issued January 13, 2009, assigned to RealD
- US patent 6975345,"Polarizing modulator for an electronic stereoscopic display", issued December 13, 2005, assigned to StereoGraphics Corporation
- US patent 5481321,"Stereoscopic motion picture projection system", issued January 2, 1996, assigned to Lenny Lipton
- US patent 4884876,"Achromatic liquid crystal shutter for stereoscopic and other applications", issued December 5, 1989, assigned to Lenny Lipton
- US patent 4792850,"Method and system employing a push-pull liquid crystal modulator", issued December 20, 1988, assigned to StereoGraphics Corporation
External links
edit
- Official website
- Who is Lenny Lipton?About Inventor and Chief technical officer of RealD through 2008