Positioning Your Projector; Obtaining A Preferred Projected Image Size - BenQ GP30 User Manual

Positioning your projector

Obtaining a preferred projected image size

The distance from the projector lens to the screen, the zoom setting (if available), and the
video format each factors in the projected image size.
16:10 is the native aspect ratio of this projector.
The projector should always be placed horizontally level (like flat on a table), and
positioned directly perpendicular (90° right-angle square) to the horizontal center of the
screen. This prevents image distortion caused by angled projections (or projecting onto
angled surfaces).
The modern digital projector does not project directly forward (like older style reel-to-
reel film projectors did). Instead, digital projectors are designed to project at a slightly
upward angle above the horizontal plane of the projector. The projector can be readily
placed on a table, and the position of its projection will be forward and upward on a screen
so the bottom edge of the screen is above the level of the table (and everyone in the room
can see the screen).
If the projector is positioned further away from the screen, the projected image size
increases, and the vertical offset also increases proportionately.
When determining the position of the screen and projector, you will need to account for
both the projected image size and the vertical offset dimension, which are proportional to
the projection distance.
BenQ has provided a table of screen size to assist you in determining the ideal location for
your projector. Refer to
dimensions to consider, the perpendicular horizontal distance from the center of the
screen (projection distance), and the vertical offset height of the projector from the
horizontal edge of the screen (offset).
14
Positioning your projector
16:10 aspect image scaled to a 4:3 aspect
display area
"Projection dimensions" on page 15 for details. There are two