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Section 2: Installation and Setup
To summarize, optical screens are better suited for brightly lit rooms where the audience is situated within the
viewing cone. Diffused screens may be better suited when a wide viewing angle is required but there is low
ambient room lighting.
2.2.7 Screen Size
Choose a screen size, which is appropriate for your lens and application. Keep in mind that if the projector will
be used to display text information, the image size must allow the audience to recognize all text clearly. The
eye usually sees a letter clearly if eye-to-text distance is less than 150 times the height of the letter. Small text
located too far from the eye will likely be illegible at a distance no matter how sharply, and clearly it is
displayed.
To fill a screen with an image, the aspect ratio of the screen should be equal to the aspect ratio of the image
(expressed as the ratio of its width to its height). Standard video from a VCR has a 4:3 or 1.33:1 aspect ratio.
For example, to display a VCR output with a 4:3 aspect ratio onto a 10-foot (3m) high screen, the width of the
screen must be at least 13.3 feet (4m).
Ideally, to fill a screen with an image, the aspect ratio of the screen should be equal to the aspect ratio of the
image. The aspect ratio of an image is expressed as the ratio of its width to its height such as a 4:3 aspect.
Standard video from a VCR has a 4:3 aspect ratio. For example, to display a VCR output with a 4:3 aspect ratio
onto a 10-foot (3m) high screen, the width of the screen must be at least 13.3 feet (4m).
2.2.8 Screen Aspect Ratio
Aspect ratio describes the proportion of the screen and is expressed as the ratio
of width to height, such as "4:3" or "5:4". . Although image size and image
aspect ratio can both be adjusted quickly through projector software, it is still a
good idea to choose a screen aspect ratio that is most appropriate for your
intended applications.
Ideally, to exactly fill a screen with an image, the aspect ratio of the screen
should correspond to the aspect ratio of the image, which depends on the source
in use. For example, standard video from a VCR has a 4:3 ratio
(approximately), whereas a high-resolution graphics signal typically has a 5:4
aspect ratio. By default, images from your projector will be as large as possible and will maintain their aspect
ratio.
The SXGA+ (1400 x 1050) aspect ratio for the Roadster S+ and Mirage S+ models are 4:3
the HD (1920 x 1080) aspect ratio for the Roadster HD and Mirage HD models is 16:9.
2.2.9 Ambient Lighting
The high brightness of this projector is well suited for locations where ambient lighting might be considered
less than ideal for projection. A typical room with ceiling lights and windows rarely requires special attention.
Contrast ratio in your images will be noticeably reduced only if light directly strikes the screen, such as when a
shaft of light from a window or floodlight falls on the image. Images may then appear washed out and less
vibrant.
In general, avoid or eliminate light sources directed at the screen.
2-14
Figure 2-21 Aspect Ratio
Roadster, Matrix WU, Mirage S+/HD/WU User Manual
(Figure
2-21) and
020-100002-06 Rev. 1 (04-2011)
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