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Even with all lighting removed it is still possible that room reflections within the
room can slightly degrade the image. Light from the projection screen should be
absorbed by the ceilings, walls and floors so that it will not be reflected back to the
screen. Again, keep reflective surfaces to a minimum.
Other considerations and tips which can help you improve your installation:
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Ventilation is an important factor when preparing a projection room. The ambient
temperature should be kept constant and below 35°C (95°F). Keep the projector
away from heating and/or air conditioning vents. Changes in temperature can
cause drifts in the projector circuitry which may affect performance.
x
Keep the projector away from devices which radiate electromagnetic energy such
as motors and transformers. Common sources of these are slide projectors,
speakers, power amplifiers, elevators, etc.
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For rear screen applications, less space is required if a mirror is used to fold the
optical path.
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Choose the right screen size for the application:
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As screen size increases, magnification increases and reduces brightness.
Select a screen size which is appropriate for the venue, but not larger
than that required.
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Installing a large screen in a small room is similar to watching television
close up; too large a screen can overpower a room. A good rule of thumb
is to be no closer than 1.5 times the width of the screen.
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Larger screens require greater attention to lighting conditions.
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When laying out the projection room, consider positioning the projector and
screen in a manner which will achieve maximum audience coverage and space
efficiency. For example, placing the screen along the larger wall in a rectangular
room will reduce audience coverage. Figure 2.9 shows two examples of how
audience coverage is maximized.
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