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Edge blending notes. – (example: PT-D6K Series).
The following describes the setup of a simple edge-blend application using two single-
chip projectors mounted side-by-side with the same signal source applied to each. (The
concept is that two lower resolution projectors (e.g. 1280 x 800) are combined to enable
the display of a higher resolution source (2432 x 800) without scaling).
1. Set the projectors side-by-side, aligning them so that they are level and as square as
possible with respect to each other and the screen. (In aeronautic terms, adjust the pitch,
roll and yaw). Select the Grid pattern by pressing Test Pattern on the remote and pressing
the left arrow key.
2. Align projector’s grid patterns so they are side-by-side. (Center the lenses by holding
down the Shift key until the Home option appears onscreen).You can then shift the
images as needed
4. Set the zoom positions on the projectors to match. Start with the smallest image
possible (this keeps the image edges away from the periphery of the lenses). Focus as
necessary.
(Wide zoom setting produces the brightest picture. If you can position the projectors
closer to the screen, and set the zoom to the Wide setting too obtain the desired picture
size, the final image will be brightest)
2. Check each projector’s menu settings page by page, and set all items to the same mode.
Use two wired remotes for ease & speed. Press the Default key to reset the values as they
are highlighted.
5. Project images and test patterns side by side, and evaluate picture quality – compare
overall brightness, color temperature, black-levels, colorimetry etc. Lamp hours should
be similar. If the projectors don’t match too well, making the final edge blend look good
will be difficult.
6. Using the grid pattern, evaluate (or measure) each projected image for “squareness”.
(If the front face of the projector is not parallel to the projection screen, keystone
distortion will become apparent).
7. For best linearity in the blended area, shift the left projector’s image to the far left and
right projector’s image to the far right. This projects the image edges that will be blended
through the center of the lens where there is the least optical distortion. (Try to avoid
using short-throw lenses because of possible chromatic aberration and image distortion
near the lens periphery. However, remember that the viewing circumstances will dictate
what is acceptable).