Front and rear projection

Planning criteria

With the date, location, and intended use, we can review which equipment and combination can be offered. You can inquire before measurements, drawings, or the final schedule are ready.

In front projection, audience and projector are on the same side of the screen. Rear projection sends the image from behind and needs a suitable surface.

We can compare paths from a sketch before final measurements. Mark audience, screen, projector, and access.

You can inquire about a screen and projector or a solution including installation, configuration, and operation. We review the assembly and its location: an option is useful only if it leaves room for viewing, circulation, and equipment service.

System decisions

Surface

Check the exact material for front, rear, or dual use. Image orientation does not turn opaque fabric into a rear surface.

Technical space

Allow optical distance, equipment, ventilation, cabling, and access behind the screen. Available depth is more than lens distance.

Orientation

Select the model’s appropriate installation position and check text from the audience side.

Placement alternatives

If rear space is limited, we can review front projection with a different layout, another image size, or documented optics for the space. If circulation in front causes shadows, we compare that route with a compatible rear-projection option.

What to share

Identify image width, available depth, and access on both sides.

Share model, lens, and surface where known. We can identify gaps before selecting an option.

Send a front and side photo, approximate image width, and audience and presenter positions. If space behind the screen cannot be reserved, tell us early so we can compare another location or front projection.

Preparing the comparison

1. Sketch both paths and mark possible shadows or obstacles.
2. Confirm surface and distance table for the actual combination. Do not assume every rear material suits every lens angle.
3. Check orientation using text and an asymmetric shape from the audience side.
4. Test under planned lighting; check uniformity, visibility, and separation of audience and technical area.
5. Sketch alternatives using the same content and audience positions. Compare the light path, technical area, and service access, then identify changes in screen, lens, and mounting so the proposals can be compared.

Three technical questions

• Does rear projection mean ultra-short throw?
• Is flipping the image enough?
• How much space is needed behind the screen?

Checks to guide decisions

Installation and limits

Keep technical area and beam separate from public circulation with a site-appropriate plan.

Check stability and ventilation without covering equipment to hide it. Use exact documentation for mounting.

Sources and context

• AV Stumpfl — front, rear and dual surfaces
• BenQ — LU935/LU935ST, installation positions

Official model-specific documentation. Check variant, accessories, and conditions before applying settings or calculations.