dynamic range

of projection displays

with chronos

high performance

optical blending


gbvi simulation applications

gbvi attractions applications


We design and manufacture custom optical blending and light path management solutions for challenging projected display environments including fixed and rotary wing flight simulators, fast-jet simulators, digital planetariums and large scale immersive spaces.

Our optical blending technologies enable system designers and integrators to overcome the hurdles faced when using digital projectors in dark environments such as light leakage, channel overlap visibility, and management of display system contrast and dynamic range.

Visual innovation is at the core of GBvi, and to be innovative means to be creative. We continually prototype new optical blending technologies and often work with unique display setups that lead us to devise increasingly innovative approaches to ensure display perfection.

Discover the Range of Chronos Optical Blending

Video projectors need to be integrated into a wide range of applications, often requiring the use of ultra-wide-angle projection lenses or third party auto-alignment systems. As a result, some projectors may need less conventional forms of blending, and that’s exactly what we offer.

Seamless image continuity is the goal and calls for the highest quality image blending that is simple to use, yet performs with all scene content and manages any layout complexity with ease.

Chronos optical blending uses physical masking techniques to provide managed fading of multiple partially-overlapped projected images so that their images are blended together to form a larger, continuous image. Our optical blending technology enables integrators to provide display systems free from the visual issues caused by digital blending. This means no ‘doublebright’ overlap regions, and no impact to contrast or dynamic range, as black level infill is no longer necessary to match blend brightnesses.

GBvi’s Chronos blending solutions enable display system integrators to achieve an even black level across multi-channel projection displays, realising the maximum dynamic range and enhancing the perception of life-like imagery.

Our technologies have been designed to generate a perfectly seamless image across multiple projector channels and are ideal for flight simulation, digital planetarium and theme park dark ride applications. Our highly flexible in-house design tools allow us to design and produce glass or film masks unique to your display for pixel-perfect projection channel edge-blending.

Chronos optical blending provides the highest quality blending, taking into account projector characteristics, display design and performance needs. Blends need not be constrained to simple geometry but instead can follow complex curves to allow you to design your system to meet tough requirements.

Download the Chronos Product Overview here

Chronos Glass

Chronos Glass optical blending is our primary blending solution and is the highest performance glass blend mask technology available in the market. Designed to generate a perfectly seamless image across multiple projector channels, it is ideal for flight simulation, digital planetarium and theme park dark ride applications.

Our highly flexible in-house design tools allow us to design and produce glass masks unique to your display for pixel-perfect projection channel edge-blending.

New Chronos Glass: Greyscale Our Chronos Glass option can now use true Greyscale technology to provide perfect, diffraction free blending for LED and laser phosphor-projectors.

Chronos Glass Greyscale addresses the ‘small 4K’ and 8K class of projection systems where some optical trade-offs are most challenging, particularly with laser-phosphor illumination.

Our new greyscale technology has been developed in-house to provide blend masks that have genuine “variable density”, opening up new options and combinations of projector and display types. Artifact-free projected throughput is achieved to result in perfect blends and even hot-spot correction in rear-projected display environments.

chronos glass greyscale

Chronos Rewind

Use of Auto-Alignment (AA) systems for projection display calibration is becoming universal.  While these systems produce excellent results, some benefit from removal of the optical blend masks from the light paths so that unrestricted projected coverage can be sensed; i.e., they require removal of the blend masks to enable alignment and calibration to take place.

Chronos Rewind is our dedicated solution that allows for these AA systems to be integrated alongside our Chronos optical blend masks as part of multi-channel projected displays.

Designed for use with a broad range of digital displays, Chronos Rewind uses an actuated platform and simple trigger interface to move the blend mask to and from the projector lens as required in a carefully controlled and precise manner.

This process allows for the blend to be retracted from the lens, auto calibration to be completed, and for the blend mask to be returned to its original, correct position.

chronos rewind

Chronos Foil

Chronos Metal Foil mask technology is designed for use with mask actuation systems and with very high brightness projectors.

It is a novel, highly robust solution, which differs from other foil solutions in that it does not use a sawtooth or comb profile, but instead migrates our pattern algorithms that have been used for high-quality glass and film blend masks.

Chronos Film

For systems that will have a low overall luminance, such as night training simulators, Chronos Film is the ideal option.

Produced using the same algorithms as our Glass range, Chronos Film offers an equally high quality blend pattern but on an emulsion film.

This film may degrade over time under high light flux, where we would suggest installing glass instead, but for darker content it will produce an excellent quality blend at a lower cost, with no risk of degradation.

Why Optical Blending?

Optical Blending is applied to the full light output of each projector and is the only fully effective method of cleaning up the unwanted projection channel overlap region in multi-channel displays. Our solid engineering approach allows us to understand and manage the complex light behaviour to create seamless blend regions, even in the most demanding of display configurations. This is especially critical when building synthetic environments, such as in the world of full-mission simulation and training.

There are many other benefits of optical blending:


Chronos performs well for all scene content, not just dark scenes.

>  Masks can remain in place for all scene intensities, simplifying integration and saving system costs.

>  Avoids “mode switch” between optical and electronic blend configurations.

>  Works with high light-output (flux) projectors.

>  Resolves “Saccade” visual effect often seen with DLP electronic blends.

>  Low-complexity installation.

>  Fixed mask plates; no motorised system.

>  Minimised diffraction blurring means that pixels remain resolved in the blend region.

>  Blending is achieved throughout the spectral range, including near-IR up to ~900nm.

>  Complex blend geometry can be supported.

>  Alignment test patterns are available at no extra cost that, used correctly, enable high-channel-count domes to be successfully aligned.

>  A wide range of Chronos blend technologies and configurations are available so that solutions can be tailored to the display system design, projector type and budget.


The Infinity Display Experience for educational spaces, attractions & themed experiences

The Void uses special display techniques and light path management to create extreme depth cues and illusions of distance – so that viewers and audiences of each installation are provided with a sense of peering into space.

Download the Void Product Overview here



Features and Options:

** Built for realistic, immersive experiences **

** Compatible with CG and real-life media content **

** Customisable exterior available to client’s request **

** Ultra-high contrast projection up to 4K **

** Uncompressed playback using 7thSense Design Delta Media Server technologies **

** Customisable touchscreen interface for interactive control over content **

** Available in a range of size, brightness, tilt angle, projection performance and playback configurations **



Themed Entertainment & Attractions | Educational & Informal Leisure Simulation 

** Queue Display – infinity viewing portals for realistic ‘through-window’ experiences **

** Transport viewers to the time and place, and to the subject matter, of the video content **

** Provide illusions of distance and depth for memorable experiences **

** Allows audiences and visitors to get close to subject matters, with incredible levels of detail with high contrast and resolution projection configurations **

** Engage audiences at Science Centres, Museums and Historical Attractions **


“IDSI has a solid relationship with GBvi – they consistently provide us with engineering services and first-class support that extend above and beyond what they’ve been contracted to deliver.

The team’s high-performance solutions enable us to fulfil high-end simulation application requests on our most challenging projects.

On-site, they are responsive to our needs and requests in near real-time – which allows us to maintain a track record of superior customer service and support across our many customer sites and projects.”

George T. Forbes, President & CEO – Immersive Display Solutions, Inc.

“Antycip Simulation uses GBvi technologies in a range of fast-jet and helicopter simulation applications – their experience, dedication to innovation and exceptional support, help us meet the technical and design challenges clients present us with.

It’s critical to our projects, that our technology partners maintain unrivalled levels of accuracy and attention to detail… GBvi is an excellent partner, in these regards, and far exceeds our expectations.”

Riccardo Rovelli, Area Manager for Italy and Germany, Antycip Simulation

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We design and build multi-channel optical blending solutions for challenging projection environments, with no limit to display size, screen shape or projector count.

As a company with a strong and long standing heritage in the field of display systems design, we work with an extensive network of integrator partners, resellers and designers to continually innovate displays products with a focus on the markets of simulation, entertainment and attractions. Our range of technologies and services provide superior quality solutions and high-performance results for even the most challenging displays; especially those requiring uniformity, clarity, invisible projection blend regions, true-to-life digital experiences, infinity displays, and ultra-black environments. Our approach to each project is unique and involves a highly customised process, with acute attention to detail.

View GBvi Ltd. profile on Ariba Discovery   gbvi named as 2017 ms&t award finalist for optical projector edge blending innovation


geoff blackham

Geoff Blackham – Founder and Director

GBvi Founder, Geoff Blackham, has more than 30 years’ experience in the simulation industry as engineer and board-level director. His main focus has been simulation display systems engineering and technology development, as well as being key to the growth of the leading simulation displays firm SEOS from 1989 until its 2008 acquisition by Rockwell Collins.

In 2011, Geoff decided to go his own way and formed GBvi, initially offering consultancy and design services to display systems integrators. Then, in 2014, the company evolved to become a visual displays product innovation company.

As innovator of many display developments, Geoff holds numerous root patents and applications. Experience and areas of specialisation include ultra-high-contrast projector development, display system development (real image and collimated) and NVG simulation. He occasionally ventures out to speak at Simulation and Training conferences.

geoff blackham

Dan Blackham – Head of Operations

Dan has 9 years’ experience in the Engineering, Simulation and Entertainment industries. He spent time at Rockwell Collins STS as Systems Technician calibrating high-performance projectors (both in the field and in the lab) in preparation for installation in high channel count domes. He spent another two years as Systems Engineer for 7thSense Design where he developed extensive experience configuring and installing high performance media servers. Dan’s time at 7thSense gained him valuable experience and expertise in display systems through working on a wide variety of projection systems including planetaria, theme park dark rides, museum exhibits and projection mapping on buildings.

Dan joined GBvi in early 2014 as a systems engineer and quickly became involved in all aspects of GBvi’s technical and administrative requirements. Dan plays a leading role in specifying customer solutions, designing custom blending systems, project management as well as being involved in new product development and continuing to provide support to customers on site.

steve johnson

Steve Johnson – Opto Mechanical Engineer

Steve is a highly-experienced engineer with a successful track record in the design and development of precision opto mechanical products.

During his 26 years in the visual display industry he has worked as a senior engineer at SEOS and Rockwell Collins and has been a key player in the design and development of Target Projectors, High Dynamic Range simulation projectors, multi-channel display systems and a high-performance HMD for human factors research.

julie blackham

Julie Blackham – Company Secretary

Julie has been working behind the scenes since the formation of GBvi, providing general administrative support.

Having studied business and accounts in Crawley and Worthing, Julie has worked in accounts and finance at Edwards High Vacuum, Gripperods International, Christian Salvesen Edinburgh, Edinburgh University, also Lamb Technicon and Music Sales Ltd in Suffolk.

With a BSc in Natural Sciences Julie has also worked for Royal Botanic Gardens Kew and for the NHS. But, with a sum of 27 years’ experience in general bookkeeping, payroll, management accounting, budgeting and auditing, she continues to use this expertise within GBvi, attending to the office administration aspects alongside the team, supporting in any way needed to keep customers, suppliers and employees happy.

rob dawson

Rob Dawson – Senior Software and Systems Engineer

Rob is a First-Class Honours Music Informatics graduate of the University of Sussex, receiving the 2013 Brandwatch Prize for Best Artificial Intelligence or Music Informatics Project.

He has extensive experience developing real-time, audiovisual and robotics applications for various platforms and languages, including Java, C#, Javascript, and C++ languages.

Rob has been a part of the GBvi team for over 2 years, during which he has transformed our software platform to provide ever-growing capabilities and has contributed heavily to our R&D achievements in the process.

sam markham

Sam Markham – Technician Engineer

Sam joined the GBvi team with a highly relevant projector test & calibration background, having spent 7 years at Rockwell Collins Simulation & Training Systems.

Following this time, he continued his technical career with the imaging company Rapiscan, where he spent 3 years building and testing precision X-ray components within a Class-1 clean room environment.

As a technician engineer within GBvi, Sam continues to work in the lab and is heavily involved in our calibration, research and development activities.

peter sinclair

Peter Sinclair – Systems Technician

Peter came to GBvi as a student in the summer of 2017, helping out whilst still studying computer science and software development, and joining us full time at the end of his course in July 2018.

He previously attended the Brighton Film School where he studied creative media production (moving image), and the performing arts, receiving distinctions in both. He has a range of practical experience behind him including freelance camera work for films and commercials and voluntary work on old Sussex railways.

Since joining us, Peter is becoming increasingly involved in our operations in many areas, including production, testing and customer support on site.