Panasonic PT-D10000 Adjustment Manual page 4

2) Rear projection system
Edge blending in a rear projection system requires caution when selecting a screen and
lens. Both hard screens and soft screens are available but the one with a wide view angle
(the higher the αH, αV, the better) and low screen gain (GS=1.0 or less) needs to be
selected.
When using a hard screen, a Fresnel, lenticular or other lens-processed screen is not
suitable for this purpose and cannot be used for edge blending.
Currently available rear screens do not include one with non-directional reflection such as
a white matte, so a diffusion type screen should be selected.
Example of a rear screen
Photo 1
Photo 2
When deflection or warping exists in a screen,
accurate overlapping cannot be achieved at
the blended part. A hard screen is, therefore,
recommended unless physical restrictions
prevent the screen from being placed in the
intended location.
Photo 1 shows the front view of the
edge-blended image consisting of two images
side by side. Due to the high screen gain of
1.6, a hot spot is visible but the blending is
reasonable when viewed from the front.
Photo 2 is the view from a side angle.
Because the light from the near-side projector
is stronger on the opposite side, the
brightness is not well-blended.
The following two approaches are effective
ways of improving this phenomenon, but the
problem cannot be solved completely due to
the directional property of the current rear
screen.
(1) Installing projectors far apart from the
screen
(2) Selecting the most appropriate screen
(low gain, wide view-angle type)
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