Panasonic PT-D5700 Manual Penyesuaian - Halaman 4

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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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