Cinema Screen Buying Guide: Material, Gain, LED and Makers

This guide is for commercial cinema screens: the large perforated surfaces in public auditoriums, and the LED walls now starting to replace them. Most of what turns up when you search for "screen material" or "acoustically transparent screen" is home theater fabric sold by the roll. That is a different product, built for small rooms and short viewing distances, and it is not covered here.

A screen is cheaper than a projector and lasts longer, so it gets less attention. It should not. The screen decides how bright the picture is from every seat, whether polarised 3D works, and how well the speakers behind it can be heard.

Matte white, gain or silver

Most cinema screens are white or silver coated PVC, according to the UNIC auditorium handbook. The choice between them is about screen gain: how much light the surface sends back towards the centre of the room compared with a matte white reference of 1.0.

Source: UNIC auditorium handbook.

The trade-off is simple. Gain is not extra light; it moves light from the sides of the room to the centre. A high-gain screen looks bright from the middle seats and dimmer from the aisle ends of the front rows. In a wide room, or one without 3D, matte white usually gives the most even picture. In a long, narrow room, or one that runs polarised 3D, gain earns its place.

For silver screens, the second number that matters is the extinction ratio: how well the screen keeps the left-eye and right-eye images apart. UNIC says ratios over 100 are good and values below 75 to 80 produce unacceptable ghosting.

Brightness on screen is projector lumens times gain, divided by screen area. The reference for 2D is 14 foot-lamberts. Use the screen brightness calculator to check a screen and projector together before you order either.

Perforated or woven: the sound question

Cinema loudspeakers sit behind the screen, so the screen has to let sound through. Commercial screens do it with perforations.

• Open area. UNIC says the holes should add up to 4 to 5% of the surface for good sound transmission.
• Standard perforation. Holes of 0.9 to 1.1 mm. If viewers sit closer than 4 to 5 m to the screen, UNIC says the holes become visible from the front rows and smaller perforations are needed.
• Micro or mini perforation. Holes of about 0.4 to 0.8 mm avoid the moiré patterns standard holes can produce with 4K images.

Manufacturer figures follow the same pattern. Harkness's published data gives its Digital Perf as 0.9 mm holes, 4.16% open area and a 4.5 m minimum viewing distance, and its Mini Perf as 0.6 mm, 2.36% open area and 1.5 m.

Smaller holes have a cost. UNIC notes that screens with dense small perforations may be impossible to weld, because the seam area is too narrow, so they may not be available in large sizes. Large screens are made by welding sheets together, and the perforation pattern must match exactly at each seam or a grey line shows from every seat.

Woven acoustically transparent screens exist, and UNIC mentions woven and nano-engineered materials alongside PVC. Most woven acoustically transparent products on the market are sold for home theaters. For a commercial auditorium, ask the manufacturer for sound transmission data, maximum size and fire certification before you treat woven as an alternative to perforated PVC.

Leave room behind the screen too. UNIC's rule of thumb is at least 1,200 mm between screen and wall for the speakers, or 1,000 mm if the last row is less than about 15 m from the screen. The cinema sound system guide covers the speakers themselves.

Size, frames and masking

Start from the room, not the catalogue. The cinema screen size calculator works out flat and scope sizes from the wall, with viewing angles checked against THX and UNIC guidance, and the movie theater floor plan guide shows how screen size fits the seating layout.

Size limits are set by manufacturing. Harkness lists maximum screen sizes of 33.0 × 14.3 m for Europe, 30.0 × 15.6 m for China and 26.5 × 13.5 m for India. Anything near those sizes is a project, not a product.

The frame matters as much as the surface. UNIC describes three types:

• Lace-in frame. The frame is larger than the screen, which is laced in with cord through eyelets like a trampoline. The picture must be 200 to 300 mm smaller than the frame, and the edges need black masking to hide the lacing.
• Wrap-around frame. The screen wraps round a frame the size of the largest picture. It allows wall-to-wall or floor-to-ceiling images.
• Roll-up screen. For rooms that need the screen out of the way, such as stages and multi-use halls. Large ones need a tube and a solid roof mount; simple roller types work up to about 5 to 6 m wide.

Decide on masking at the same time: top-and-bottom masking keeps the width constant between flat and scope, side masking keeps the height. It shapes how the room looks for every film and is hard to change later.

Curved screens

Curving the screen evens out brightness across it and keeps the hotspot nearer the centre when seen from the sides. UNIC's guidance is specific:

• Screens are curved horizontally only.
• Do not use deep curves. A good compromise is a 5% curve, where the depth of the curve is 5% of the straight width between the screen edges.

Curvature matters most on wide screens and with gain or silver surfaces, where brightness falls off at the edges. Ask the manufacturer to model brightness from your corner seats with and without curve before deciding.

Who makes cinema screens

A small number of manufacturers supply most commercial projection screens, usually through integrators. The screens section of our supplier directory lists them.

Compare them on the same specification: surface and gain, perforation, maximum seamless or welded size, frame type, fire certificates for your country, delivery and installation. Ask for a sample under your own projector if the room is unusual.

LED cinema screens

An LED cinema screen is not a better projection screen. It replaces the projector and the screen with one self-lit display, and it changes the auditorium around it.

What changes, according to UNIC's handbook:

• Brightness and black. Luminance can reach about ten times that of a projected image, and black stays close to black even with house lights on.
• Fixed sizes and ratio. Panels come at 4096 × 2160 (4K) or 2048 × 1080 (2K) pixels in set physical sizes, so the room is fitted to the screen rather than the other way round.
• Depth. The display is about 0.5 to 0.6 m deep, and 1.0 to 1.5 m with rear service access.

The biggest change is sound. An LED wall is solid, so screen speakers cannot sit behind it. They have to go around or above the picture, and that needs its own acoustic design. Settle the speaker plan before signing for an LED screen. For a direct comparison with laser projection, read the cinema projector buying guide.

Fire ratings

A screen is a large area of plastic in a room full of people, so it has to meet the reaction-to-fire rules where you are. There is no single global standard. Harkness says its cinema screens are tested and certified to UK BS 5867 Part 2, USA NFPA 701, France M1, Germany B1, Spain M2, Italy Class 1 and standards in Japan, Korea and Australia. It also says that because test methods vary, compliance should be checked against the standard of the country of installation, and offers small samples for local fire testing.

In practice:

• Ask for the certificate that matches your country, for the exact surface and perforation you are buying.
• Keep it on file with your fire risk assessment or for your fire inspector.
• For a used screen, assume the certificate is missing unless you can see it.

What a cinema screen costs

We have not found a reliable public price for a commercial auditorium screen. Manufacturers quote per project, and the public tenders we found bundle the screen with projection or building work. The price depends on:

• Size, and whether it needs welded seams.
• Surface: matte white costs less than gain or silver 3D surfaces.
• Perforation: mini or micro perforation for close seating or 4K.
• Frame: fixed, curved, roll-up or motorised, plus masking.
• Installation: access equipment, removing the old screen, and working around speakers.

An LED screen is a different budget line altogether, because it replaces the projector as well. Get at least three quotes to one written specification. The cost to open a movie theater guide places the screen in the full capital plan.

Care and when to replace

Harkness recommends cleaning a projection screen every six months with a dry microfibre cloth, using vertical strokes from top to bottom, and warns that silver 3D screens are easily damaged if cleaned the wrong way. Dust from air conditioning, popcorn and handprints is the usual cause of a dirty screen. Take care not to push the screen into the speakers behind it while cleaning.

There is no fixed replacement age. Replace when:

• Measured brightness is low and the projector is not the cause. Measure, do not guess. Harkness sells an HSG Labs Checker for spot checks of brightness and audio at €1,100, $1,255 or £935 plus taxes and shipping.
• The surface is stained, scratched or yellowed in a way cleaning does not fix, or seams have become visible.
• You are changing the 3D system, for example moving to or from polarised 3D, which needs a silver surface.
• You are moving to 4K or seating people closer, and standard perforations show moiré or are visible from the front rows.
• You are replacing the projector. A new light source and a new screen should be specified together, because gain and brightness are one calculation.

Used screens are sold when cinemas close or refit. Check the surface type, size, perforation and seams, how it was rolled or folded, and whether you can get a fire certificate for it.

Buyer's checklist

1. Measure the room: wall size, throw, seating distances from first and last rows, and depth behind the screen.
2. Work out flat and scope sizes with the screen size calculator.
3. Choose gain from the room shape and 3D system; check brightness with the projector you have or plan to buy.
4. Choose perforation for your front-row distance and resolution, and confirm the size can be made and welded with it.
5. Decide frame, curvature (no more than about 5%) and masking together.
6. Get the fire certificate for your country, for the exact surface.
7. Get three quotes to one specification, including removal and installation.
8. If you are considering LED, settle the speaker layout and the room depth first.
9. Book a brightness measurement after installation, and clean the screen every six months.

The screen is what the audience looks at for two hours. What brings them back is everything around it, from your showtimes page to the checkout, and that is Filmgrail's part.