RealD 3D
 Two pairs of RealD glasses demonstrating the polarization effect | |
| Type | 3D projection technology |
|---|---|
| Manufacturer | RealD |
RealD 3D is a digital stereoscopic projection technology made and sold by RealD. It is currently the most widely used technology for watching 3D films in 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]
Technology
RealD 3D cinema technology is a polarized 3D system that uses circularly polarized light to produce stereoscopic image projection. The advantage of circular polarization over linear polarization is 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 incorrect parallax and prevent the brain from correctly fusing the stereoscopic images.
The high-resolution, digital cinema grade video projector alternately projects right-eye frames and left-eye frames, switching between them 144 times per second.[3] The projector is either a Texas Instruments Digital Light Processing device or Sony's reflective LCOS (liquid crystal on silicon). A push-pull electro-optical liquid crystal modulator called a ZScreen is 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 wears circularly polarized glasses that have oppositely polarized lenses that 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 subtle ghosting and stuttering on horizontal camera movements. A silver screen is 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 picture that seems to extend behind and in front of the screen itself.[5]
See also
- Polarized 3D system
- List of 3D films
- Digital 3D
- IMAX 3D
- Disney Blu-ray 3D
- Panavision 3D
- Dolby 3D
- XpanD 3D
- MasterImage 3D
- Lenny Lipton
- 4DX
References
- ↑ Verrier, Richard (2009-03-26). "3-D technology firm RealD has starring role at movie theaters". Los Angeles Times. http://articles.latimes.com/2009/mar/26/business/fi-cotown-reald26.
- ↑ ""Jurassic World" In 3D Delivers Approximately 65% Of Universal Pictures Record-Breaking International Opening Weekend". RealD. http://www.reald.com/ir/news-and-events.
- ↑ 3.0 3.1 Cowan, Matt. "Real D 3D Theatrical System". European Digital Cinema Forum. http://www.edcf.net/edcf_docs/real-d.pdf.
- ↑ "RealD - Visual Technology". http://www.reald.com/.
- ↑ Cowan, Matt. "Presentations (technical)". RealD Media Room downloadable files. http://www.reald.com/Content/Presentations.aspx.
Further reading
- "Enhanced ZScreen modulator techniques" US patent 7477206, issued January 13, 2009, assigned to RealD
- "Polarizing modulator for an electronic stereoscopic display" US patent 6975345, issued December 13, 2005, assigned to StereoGraphics Corporation
- "Stereoscopic motion picture projection system" US patent 5481321, issued January 2, 1996, assigned to Lenny Lipton
- "Achromatic liquid crystal shutter for stereoscopic and other applications" US patent 4884876, issued December 5, 1989, assigned to Lenny Lipton
- "Method and system employing a push-pull liquid crystal modulator" US patent 4792850, issued December 20, 1988, assigned to StereoGraphics Corporation
External links
- Who is Lenny Lipton? About Inventor and Chief technical officer of RealD through 2008
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