signal) will display in a 4:3 aspect ratio (and will require an additional 33% display height than that of the scaled 16:9 aspect image projection area).
IMPORTANT: Do not select a permanent projector position based upon a 16:9 projection if you will ever need to select an input other than composite Video being fed a 16:9 aspect signal.
The projector should always be placed horizontally level (like flat on a table), and positioned directly perpendicular (90°
The modern digital projector does not project directly forward (like older style
You can see from the diagram on page 15, that this type of projection causes the bottom edge of the projected image to be vertically offset from the horizontal plane of the projector. 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 directly proportional to the projection distance.
BenQ has provided a table of
How to determine the position of the projector for a given screen size
1.Select your screen size.
2.Refer to the table on page 15 and find the closest match to your screen size in the left columns labelled '4:3 Screen Diagonal' and '4:3 Aspect in mm'. Using this value, look across this row to the right to find the corresponding average distance from screen value in the column labelled 'Average'. This is the projection distance.
3.On that same row, look across to the right column and make note of the vertical Offset value. This will determine the final vertical offset placement of the projector in relation to the edge of the screen.
4.The recommended position for the projector is aligned perpendicular to the
horizontal centre of the screen, at the distance from the screen determined in step 2
above, and offset by the value determined in step 3 above.
For example, if you are using a
If you place the projector in a different position (to that recommended), you will have to tilt it down or up to center the image on the screen. In these situations, some image distortion will occur. Use the Keystone function to correct the distortion. See "Correcting keystone" on page 24 for keystone correction.
Positioning your projector | 13 |