Chronos Glass: Greyscale

High-Resolution Solution
Chronos Greyscale optical blending offers to projection display integrators the highest performance available in the market for blending multiple channels of virtually any projector type into a single seamless image.

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.

Usually, every display design is unique and can involve complex blend configurations to meet almost any requirements. Sometimes, however, commonality and/or standardisation in the display design can be exploited to enable cost savings and/or to simplify of integration.

Contact GBvi to discuss how we can help you simplify your projection displays and start to save time and money!

Commercial Flight Simulation


Chronos Greyscale optical blending quality rivals high-end digital blending for daytime scenery.  This means that the blend masks can be fixed in place for all simulated times of day, avoiding the need for the complexity of mask actuation systems and hence saving the maintenance and cost overhead.  Further, simpler mechanical support framework is required, reducing mass and improving stiffness when used on motion simulator platforms.


Given the common display design often employed on multiple platforms, non-recurring engineering is needed only once per display variant – including minor differences between display variant s (e.g., projector selection). GBvi is able to model the optical behaviour in a collimation system to optimise the blending performance.  

Cylindrical Screens


Typically, projection displays for concave cylindrical screens allow for a common Chronos Greyscale optical blend plate design to be used on a range of different configurations while continuing to provide all the benefits that the technology offers.  Again, given the seamless blends achievable, simple mechanical interfaces can be used, avoiding the need for complex actuation systems and their attendant maintenance overheads.


Most cylindrical projection display designs can use “vertical” blend mask orientation – i.e., the plane of the mask is vertical in world coordinates, as would be the cylindrical screen axis.

A growing library of standard mask designs can be selected from and applied to a specific display configuration, provided sufficient projection overlaps have been allowed for.  Contact us to see how you can upgrade your display at keen pricing.

Fisheye and UST Lens Compatibility


Often, large field-of-view dome displays are designed with low projector-count displays – for example, a planetarium with two projectors covering a quarter-sphere each to realise full hemisphere projection.  Fisheye or semi-fisheye lenses are needed to meet this coverage, which can result in total projection angles approaching or even exceeding 180°. Flat plate optical masks will often not work with such lenses as the projection beam incident angles on the mask will be too shallow (or even impossible).

GBvi has developed a cylindrical Chronos Greyscale mask product to meet this challenging requirement by “wrapping around” the fisheye lens, reducing the range of incident angles.

Transmission and blend performance is the same as for the standard flat-plane masks. 


Our design tool can accommodate non-flat mask substrates and accurately calculate blend geometries and profiles for use with fisheye lenses.  In the project design phase, we work closely with you to ensure the key physical and optical parameters are observed and that lens behaviour is taken into account.

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