REAL D 3D theatrical system - EDCF: Home Page

1 real D 3D theatrical SystemA Technical OverviewThe real D 3D theatrical system delivers a high quality 3D movie experience to theviewer. The system is designed to operate on existing digital cinema systems, thatinclude a 3D enabled server and a DLP Cinema system is classified as a single projector, passive glasses, and circularly basic system elements are: 3D enabled server and DLP Cinema projector real D Z screen and controller Silver screen Passive circular eyewearThe system architecture is outlined in the diagram 1: Block diagram of real D 3D systemThe 3D enabled server accepts stereo movie content from the stereo digital cinemapackage.

2 It is decoded and sent to the projector as separate 24 fps left and right streams,over the A and B HDSDI links on the input of the projector. The projector buffers theleft and right image and projects them in alternation, at a rate of 144 frames per second,presenting three flashes of each DigitalCinemaPackage3D enabledDC ServerProjectorLeft-Right parallel streamsLeft-Rightseries stream Z Screen polarizationswitchPolarizedGlassesLeft circularRight circularSynchronizationSame lens projects left and right eyesThe image is projected through a Zscreen (see picture below). The Zscreen is a liquid crystal basedpolarization switch that is synchronizedwith the projector, and alternates theprojected polarization of the image foreach eye.

3 It switches at 144 fps,synchronized with the DLP Z screen creates circularpolarization. This has the advantage of allowing the viewer to tilt his headwithout introducing 2: Picture of real D Z screen in front ofdigital cinema image is projected onto a silver screen. Silver is required to maintain thepolarization of the projected image. The silver screen has a gain of , referring to thefact that it preferentially reflects the light towards the audience, providing a brighterimage than would be available from a matte white viewer wears passive circular polarizedglasses.

4 These glasses have circular polarizingfilms that have been designed to exactly matchthe output of the Z screen, for best performancein colour, transmission, and ghosting. Theglasses are designed to be comfortable to wear,even over regular glasses, and are are intended for single use, ensuring thatthe viewer gets a pristine pair every the movie is finished, the glasses may betaken home as a souvenir, or to reuse at thenext 3D movie. If the viewer doesn t take themhome, they may be recycled or refurbished, tominimize the environmental 3: real D glasses in actionThe DetailsSystem single projector 3D systems suffer from significant light loss.

5 From a theoreticalpoint of view, single projector systems lose 50% of their light through duty cycle operation where the light is split between the left and the right eyes. The light isdiminished by polarization, by an additional 50%, leaving a theoretical 25% available foreach eye. The theoretical efficiencies are reduced by the practical issues of transmissionefficiencies and allowing for switching time of the Z screen. The silver screen with again of between and helps because it makes the image the end of the chain, the viewer sees about 35% of the light that would be seen in a 2 Dsystem projecting on a matte white 4: The viewer sees approximately 35% of the projected light through the ManagementREAL D s single use eyewear has a significant benefit to the theatre operator and thetheatre patron.

6 The theatre does not need to provide manpower to collect, clean, andinspect glasses before giving them to another customer. The single use eyewear ispristine when taken out of the issues are a concern. real D is implementing a system to collect andrefurbish eyewear at a central facility which will clean, inspect, and repackage theeyewear for re-use. Any eyewear that isn t suitable for refurbishment will be sent forplastic gain screenFilm or DigitalProjector35544443 Light output = Z Screen transmission x screen gain polarized glasses loss10,000 lumensModulator,blanking,19328068890 Duty cycle 50%Blanking 8%Modulator transmission 42%Glasses transmission 80%Silver ScreensSilver screens are necessary to maintain polarization of the projected image.

7 Significantresearch has been done on silver screens and the latest generation of silver screens offersbetter light distribution and better uniformity than possible in the screens provide significant benefits because of their gain. For 3D presentations,they provide a brighter image than would be possible on a matte screen, which makes itpossible to illuminate larger screens and project a brighter image for the 4: Plot of screen brightness vs screen size for different screens. from a 20,000 lumenprojector, showing the need for high gain screens to illuminate larger screens 2D presentations, the silver screen requires less light to make the same imagebrightness.

8 In a typical 13 meter screen, this results in annual savings or more than$1300 annually in lamp and electricity costs and the reduced electricity use results inreduction of 3 tonnes of CO2 production is the leakage of one eye s image into the other eye. Every system has inherentghosting, and the best 3D images will result from minimizing ghosting. The real Dsystem minimizes ghosting by a method of pre-compensation (aka ghost busting ) thatanalyzes the left and right images and predicts the level of ghosting that will occur in theprojected image. The pre-compensation provides an image to the eye that is virtuallyghost Brightness in Triple Flash Flat05101525354555 Screen size (ft)Screen brightness (fL) FidelityPreservation of correct color is important to3d systems.

9 The real D system is virtuallycolour neutral and the system will produce thesame colour gamut as the DLP projector. Thecolor and spectral characteristics are identivalfor each eye, assuring comfortable is no need to apply additional colormanagement to ensure exact DCI exactly the same colour presented toeach eye provides a benefit for some colorblind viewers, who will have difficulty withimages that do not provide the same colorspectrum to each 5: real D supports the full DCI colour gamutSystem ReliabilityREAL D has more than 1000 systems installed worldwide and has accumulated over700,000 hours of operating time on in the past 2 years.

10 There have been no lost shows asa result of failure of the real D Z screen Flash for better motionThe real D system uses triple flash to provide the best motion rendition possible. Useof triple flash puts the refresh rate above the normal flicker fusion threshold for humans,providing smoother motion. The triple flash approach also makes the left and right eyeimages to appear closer in time, giving significantly less motion induced parallax errorsand therefore more comfortable motion Projector Architecture for a better experienceA single projector for projecting 3D has the obvious benefit of not requiring the purchaseof a second projector to project a 3d image.