28 sept. 2015

Presenting laser projection to the Giant Screen Cinema Association (GSCA)

4 minutos leídos

Most of our laser blog readers are from the global cinema industry. But this post is about a special, unique and impressive segment of that industry: the world of the “giant screen”.


The Giant Screen Cinema Association (GSCA), held its international conference and trade show in San Francisco this year. I was honored to have been invited to speak about the impact of laser illumination on a panel of industry experts from different backgrounds ranging from filmmaking for the giant screen to star show producers for full dome planetariums.

The GSCA represents a diverse group of theaters, museums, multipurpose venues - all with a common interest: showing content on… GIANT SCREENS. Though unified in this common first principle, they quickly show their fierce independence. First they divide into flat screen vs. dome exhibitors and become more specialized from there.

The industry includes 1,040 screens – 927 flat and 113 dome screens – worldwide. Of these 1,040 screens, 836 have converted to Xenon-illuminated digital – mostly dual – projector systems. The remaining 204 are giant film (70mm) theaters. This is where laser illumination is essential. Giant, high-resolution, 70mm film images have been the staple of the GSCA for over 40 years. But with the conversion of mainstream cinema to digital and the resulting decline in film availability, GSCA members are facing an existential threat. They need digital solutions and the sooner the better.

Only ultra-high brightness laser illumination can provide the solution: both big, bright images and the flexibility and economy of digital distribution.
Laser illumination for the giant screen

With more than 54,000 screens installed across the world, Barco is the global leader in digital cinema projection. Barco is also the leader in laser-illuminated digital cinema, with over 50 installs in 15 countries. What’s probably less well-known is that Barco provides the laser technology for IMAX’s new GT Laser Cinema system. This system was recently installed at the AMC Metreon in San Francisco on an unbelievably giant, 100 by 70 foot, totally immersive screen.

The conference opened with a brief explanation of the IMAX laser system and two new giant screen movies: Wild Africa 3D and National Parks Adventure. The laser system was used for all of the week’s flat screen content, both 2D and 3D. The conference included a technical deep dive on Friday afternoon, containing some GS camera test footage and a comprehensive presentation by IMAX’s Chief Quality Officer, David Keighley. 

Understand that the GSCA doesn’t take its moniker lightly. It has developed a specification that defines what GS means. The DIGSS (Digital Immersive Giant Screen Specifications) is similar to the DCI Cinema standards but it has its own unique requirements. Its key elements are:

  • Screen size - ≥70 x 53 feet (21 x 16 meters) 4:3 native aspect ratio (although 1.89:1 is allowed in smaller theaters)
  • Peak Luminance ≥20fL for 2D and ≥6fL for 3D.
  • Contrast >2000:1
For calibration, the IMAX GT screen in San Francisco is 100 x 70 feet or 7,000 ft2. To achieve 20 fL on a gain 1 screen would require 140,000 on-screen lumens. That’s why two laser-illuminated projectors are required. 
Barco’s contribution to the giant screen world

In 2012, Barco demonstrated the world’s first, integrated (read: lasers inside the projector), high-brightness laser-illuminated projector prototype. It weighed in at 54,000 lumens and stunned the entire cinema industry. Shortly thereafter IMAX and Barco announced an exclusive partnership to provide the GS world with a projection system, the likes of which the world had never seen.

Barco provides the laser technology for IMAX’s unique, high-performance, dual 4K projector system. David Keighley provided the rundown on performance on the huge, 100 foot-wide screen.


  • >20fL 2D on the 100 x 70 foot screen (50% brighter than DCI)
  • Full 4K chip 4:3 aspect ratio with >4K net resolution 
  • On-off contrast twice that of film >8,000:1
  • 6 Primary 3D aka “6P” - brighter than film 3D
  • Saturated wide color gamut capable

All of these performance requirements are supported by Barco laser technology, reliability, lifetime and efficiency.

Personally, this opportunity to eyewitness the enormity of what laser will do for GS presentation was nothing short of breathtaking. Whether it was the 3D antics of weightless astronauts on the international space station or huge, wide, ultra-high resolution shots of my favorite piece of rock, Half Dome, in Yosemite Valley, like Yosemite itself, the scale of these images have to immerse you to be fully comprehended. Size matters!
Thursday technology trends panel discussion
On Thursday afternoon, I had the opportunity to join five industry colleagues on a panel to discuss technology trends in the GSCA world and in my case, make some observations and predictions about how laser illumination is and will impact the GSCA world. The panel was co-moderated by Paul Fraser, a longtime contributor to the GSCA world of technology, marketing and business, founder and President of Blaze Digital Cinema Works and Martin Howe, a longtime developer of Giant Screen technology, theaters and attractions, now CEO of Teq4 Consultancy.
Unlike many panels I have been on, Paul and Martin went to great lengths to solicit questions from the GSCA membership and structure them to comprehensively cover all aspects of the technology. Now I can occasionally go “geek” in these settings, but after having seen the “real deal” on screen, most of my comments focused more audience impact than how the laser technology works. 
The one thing that laser can do that no other illumination technology can, is generate lumens in huge quantities – efficiently and with ruthless control of uniformity, brightness, contrast, and wide gamut color saturation. 

For the GSCA membership, I had only one critical recommendation: do what no other medium can – spend the lumens on scale and immersion. Flat or dome, laser is the only platform for a truly unique and unmatchable experience.

Photos courtesy of my good friend James Hyder, editor of the Large Format Examiner Photo by James Hyder. © 2015 by Cinergetics, LLC.