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Colour Wheel Options
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W H I T E P A P E R
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projectiondesign unique Colour Wheel Options
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All projectiondesign professional F-series projectors have the option of user
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specified colour wheels options, to perfectly match application requirements.
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DLP™ technology creates projected images by presenting colours in a
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sequential format, using the primary colours red, green, and blue to create
and reproduce any computer or video generated colour or combination of
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colours. Sequential colour display works by displaying only one single colour
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at the time, for very short periods, so that the eye and brain interprets the
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resulting image as a full colour one. Switching between the primary colours,
thus creating full colour images, happens incredibly fast, imperceptible to the
human eye.
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By giving the user or integrator the option to specify colour wheels,
projectors can be tailored to specific requirements and applications,
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such as pure black and white imaging, wide colour gamut simulation and
visualization, general graphics display, medical imaging, and so forth.
Each colour wheel option gives slightly different performance characteristics,
enabling a perfect match to the desired applcation.
What are the options?
Each model has slightly different options, depending on their specification
and construction. There are, however, certain options that can fill or fit the
same requirements, even though the actual colour wheel is different. There
are three main categories:
•
High Brightness
•
General Graphics Display
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Visualization and Simulation
Obviously, colour wheels that fit into these three categories can also be used
for other applications. More applications in general, and their anticipated
requirements, are listed below.
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W H I T E P A P E R
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Colour Wheel Option details.
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Colour wheels are built up using differently sized segments, consisting of
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the primary colours RGB, and with added accents, such as a clear (“White”)
segment, or a neutral density green segment (“NDG”) segment.
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Addition of a clear segment
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The addition of a clear segment in the colour wheel increases maximum
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available brightness from a projector. By allowing white light from the lamp
to pass through without being obstructed or coloured, white areas of an
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image, for instance a work sheet in Microsoft Excel, or a page in Word, will
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RGB40
RGB100
gain
an incredible light output. Adding a relatively large size clear segment is
RGBRGB(ND)G
common for business and presentation DLP™ projectors, as brightness and
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specifications are very important. Using a smaller clear segment gives added
benefits; extra boost in white parts of the image, thus increasing available
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brightness, and at the same time adding more brightness in colours, thus
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displaying an image more suited for graphics and general usage.
RGB80
RGB
Options for clear segment sizes
projectiondesign offers differently sized clear segments to fit various
products and various uses and applications. They are generally referred to
after their intended use or main properties, for instance High Brightness
(largest clear segment), or Graphics Display (smallest clear segment). For
best possible application fit, it is important to have a clear understanding of
the purpose of the installation when ordering projectors. Refer to table below
for applications and recommendations.
RGBRGB(ND)G
RGB40
RGB100
3-segment RGB, and 6/7-segment RGBRGBG, no clear.
The best possible image quality is reached with the 3- and 6-segment colour
wheels, without any clear segment at all. Removing the clear segment,
and only using primary colours for image display, gives better saturation in
colours, on the expense of some maximum brightness. Image quality as such
RGB
RGB80
increases. The resulting larger area per colour yields better colour resolution,
decreased artefacting, and an overall more balanced image than when using
a 4-segment wheel. In addition, the 3-segment, and 6/7-segment colour
wheels feature higher speeds, so more revolutions per minute, which results
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RGBRGB(ND)G
in decreasing visible colour break up artefacts and so-called rainbow effects.
A 6-segment colour wheel doubles the speed over a regular wheel, and draws
the image twice as many times in a given period. 3-segment wheels run even
faster, so even with a reduced number of segments, share the same feature.
This particular feature, plus the increased colour resolution and saturation,
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RGB
make these wheels the primary options for applications such as simulation
and visualization. 6-segment RGBRGB colour wheels are available for XGA
and 720p resolution projectors, whereas 3-segment RGB are available
for SXGA+ resolution projectors. They fill the same requirements. Please
note: 7-segment colour wheels with NDG accents are not available for the
professional F-series, only for 16:9 HDTV displays (720p or 1080p).
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Sample application details and recommendations
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Visualization
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A vast range of applications can be covered under the visualization umbrella.
Generally, visualization is commonly used about applications that seek to
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graphically present large amounts of data, be it photographic or computer
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created, such as geophysical data (for instance oil and gas well exploration),
CAD/CAM construction and photorealistic rendering, computer modelled
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flow and stress analysis, etc. Immersive and augmented displays and Virtual
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Reality go in the visualization category. Visualizatoin aids in understanding
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and interpreting data, and in general, require very high resolution displays,
and photorealistic colours with great depth and contrast. Recommended
colour wheels; 3/6-segment (primary), or 4-segment (secondary) with a small
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clear segment added for extra impact.
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Simulation
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Some simulation applications can be covered under the visualization
umbrella, but in this case, we refer to simulation as that what talkes place
as a substition of real life application. Simulation is primarily used in training
situations, such as for driving, flying, sailing and bridge (ships), as well
as shooting, fire extingushing and a whole lot of other training situations.
Common to most of these applications is that they require photorealistic
rendering, high contrast and detail, and reduced artefacting in the form
of rainbows and breakup. Recommended colour wheels; 3/6-segment for
reduced artefacting and realistic colours.
Medical imaging
Medical imaging applications include for instance MR and XRay imaging.
General requirements include an accurate grey scale, a correct gamma
transfer function, increased colour depth and reduced artefacting. These
are, of course, a very small part of the requirements in this field, but they are
relevant to the choice of colour wheels. Recommended colour wheels; 3/6segment, or 4-segment with a small clear segment added for extra impact,
depending on the actual application.
Business presentations
Most business presentations take place in rooms and environments where the
presenter has little or no control over lights and environment. High brightness
is often the main requirement, as that makes the presentation easier to see
and the environment less of a problem. Recommended colour wheels; high
brigthness, 4-segment, or a general graphics display colour wheel (smaller
white segment), for improved colour reproduction.
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Colour wheel configurations and projector model fit
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application
colour wheel recommendation
F1+ XGA
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general office applications,
business presentations
High Brightness (4-segment, RGBW)
some visualization,
control room applications,
24/7 applications,
general multipurpose graphics display,
public display and POS installations
Graphics (4-segment, RGBW)
simulation, high end visualization
Visualization and Simulation,
3-segment RGB, or 6-segment, RGBRGB
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F1+ SXGA+
F3/F3+ XGA
F3/F3+ SXGA+
F1+ XGA
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Available for (order no.)
F1+ SXGA+
F3/F3+ XGA
F3/F3+ SXGA+
F1+ XGA-6
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F3/F3+ XGA-6
F3/F3+ SX+3
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