The Projector Specialist

National Sales Line

1300 88 11 79

Adelaide

Brisbane

Melbourne

 

(08) 64677744

(07) 33332744

(03) 90956744

Perth

Sydney

 

(08) 64677744

(02) 80042744

ProjectorsScreensLampsAccessories
    GoTo UK Projector Site

The Australian Projector Specialist

 

Home |  Contact |  FAQ |  Projector Guide | Add Projectisle to your projector links Short List View Cart

 

Projector Screens

_____________________________________________________________________

track

A projection screen is probably the least considered factor in setting up a projection system.  Do you need a screen at all?

 

What is the purpose of a projection screen?

 

The purpose of a projection screen is to reproduce visual information without losing image quality and to distribute the projected light towards the audience; it plays an integral part in the quality of the displayed image. Projecting without a screen will compromise the image in one or more ways.

  • Resolution loss

  • Brightness drop

  • Spectrum Shift

  • Hot Spotting

How do projection screens work?

 

Projection screens maximize the light coming from the projector by reflecting more light back to the audience. They are made using high-tech fabrics, that either focus or diffuse the light shining on them and control how that light is reflected back to the viewer. With the lower light output of older projectors (below 500 Lumens), screens were a necessity to maximize the light and were generally "High Gain"  . Now with the high lumen projectors (anything above 2000 Lumens) this isn't so important to have a high gain screen. 

A projection screen has to reflect and distribute the projected image in such a way that everyone in the room can see and read the image clearly, so optimum image quality can only be achieved if the projector and projection screen are perfectly matched to the room.

 

Screen Paint

 

A good option in certain instances if to paint a wall. A painted screen can be cost effective, long lasting and less intrusive. Obviously the right paint has to be used. Projecting on an ordinary painted wall can scatter the light in the same way as the beaded screens. Bog standard white paint is never white! the slight yellow colour will move the colour spectrum of the image and can suffer from hot spotting while the overall image brightness can drop (see below) . Specially formulated paint is designed to stop spectrum colour creep reduce hot spotting and increase the contrast. We sell the industry recognised standard in screen paint - Scream (Screen Cream) paint products. Scream paint has been tested by Projectisle and found to be as good as leading screens, great for inconspicuous screens inside and outside, simply paint the hole wall white.

 

projector guide to screens image on screen and on wall

 

Screen Size


The bigger the screen, the more lumens you will need. If you double the screen size - say from
60 in. diagonal, to 120 in. diagonal, you will need a projector with 4 times the brightness. If you think of a torch shining on a wall the larger the beam the lower the brightness. So a good idea is to work out the size of the image you want. This is not just as big as the wall. Remember that you should be at a distance from your screen less than 1.5 times its diagonal for that real cinema feel.

 

Screens can alter light in 4 different ways:

 

 

 

1. Diffusive – reflects with almost complete diffusion

 

 

 
 

2. Reflective – reflects in the opposite direction to the source (if the      projector is ceiling mounted, light is reflected from the screen back toward to floor.

 

     
 

3. Retro Reflective – reflects back to the source


 
 

4. Rear Projection - Light is difused through the screen

 

 

Low Gain

 

A low gain screen is Diffusive and the material has a gain of between 0.9 and 1.3. i.e. it reflects 90% to 130% more light than the standard white magnesium oxide board in exactly the same conditions.

(white magnesium oxide board is used as the benchmark to compare to.)

As stated High gain screens were more necessary when projectors were low lumens, but Low Gain screens offer advantages:

  1. Give a greater viewing angle - so no matter where you and your guests sit the picture will be equally bright & clear, perfect for most Home Theatre situations.

  2. Don’t hot spot.

  3. Are matte white – this gives colour neutral reproduction, so all of your movies look natural and life like

High gain screens

 

A high gain screens are either Reflective or Retro Reflective and the material might have a gain of 1.8 or even 2.2. i.e. it reflects 180% or even 220% more light than the standard white magnesium oxide board.

With a high gain screen that is reflective a ceiling mounted projector will reflect the light back at the floor, not necessarily where your audience is sitting.

A high gain screen that is retro reflective will direct the reflection back to the projection source. – not easy if your projector is ceiling mounted.

So as you can see both Reflective and Retro Reflective offer a reduced viewing angle!

 

Do I choose a screen with 1:1, 4:3, or 16:9 ratio?

 

Generally when choosing the aspect ratio of your screen its worth taking into account the aspect ratio of your projector. If your projector is natively 4:3 match this with a 4:3 screen. This will give you the best effect filling all available screen space and optimizing the projected image.

Please remember: As a guide you should be at a distance from your screen less than 1.5 to 2 times its diagonal for that real cinema feel.

 

Rear Projection

 

  • Housed inside the large cabinet of a rear projection unit is a projector aimed at a mirror that reflects the image onto the rear of a display screen.

  • The mirror enables the image to travel far enough to be seen without requiring the distance that front projection normally requires.

  • The mirror in a rear projection unit allows for large images while maintaining a relatively slim profile for the home or in the boardroom. A permanent rear-projection system can be installed into a wall for a neater and more impressive finish.

  • Rear projection screens also have the benefit that people are less likely to walk between the projector and the screen, casting shadows over the image.
    Rear projection screens tend to be considerably more expensive than front projection screens.

  • Screen Size relative to Format

     

    Consider this for a moment. Most people will install the widest possible screen they can fit into the space available, regardless of its format. Screen width is almost always the limiting factor. For example, in my theatre space I had two choices. I could install a 16:9 screen that was 8 feet wide, or a 4:3 screen that was 8 feet wide. If I installed a 16:9 screen it would be 8 feet wide and 4.5 feet high. But if I installed a 4:3 screen, it would be 8 feet wide and 6 feet high. The 8-foot width is limited by the room; the screen height is my option.

    Now between these two options, how big is my 4:3 image? On the 4:3 screen it is 8 x 6 = 48 square feet. On the 16:9 screen, it would have been 6 x 4.5 = 27 square feet. That's almost half the size! And that's the difference between being at the Eagles concert and seeing it on television.

    Meanwhile—and here is a key point—my 16:9 image size is the same either way— 8 x 4.5 = 36 square feet. So the only variable is how I want to display 4:3. Do you want to maximize the use of your wall space? The 4:3 screen gives you more viewing area since it uses more vertical space on the wall.

    I would never give up seeing the great classic films or music videos in the largest format I can manage. Especially if it was for a reason as nonsensical (to me) as making sure that all of my 4:3 material was displayed in a "smaller" format than a widescreen movie. So the bottom line is this: I personally don't believe that a 4:3 image should be smaller than a 16:9—I'm a Big Picture guy and I want them both as big as I can fit on the wall. In my case, that means they are both eight feet wide.

    Now, you may like 4:3 material in smaller format, and the widest regions of your screen reserved for widescreen material. And if you do, then by all means go with your gut. We are talking about YOUR entertainment here. The real purpose of this discussion is to get you to think about what you want to see and how you want to see it. Then set it up the way you want it. There is no "right" solution. There is only the right solution for you.

    Material

     

    Front projection screens have been offered in a variety of different materials from glass beaded, pearlescent to grey and silver or silver-lenticular. All of these have been shown to have their limitations. The main reason for their use was their high gain or higher contrast over Matte white screen material but the gains come at a cost. But Matt white is by far the best overall solution for modern LCD and DLP Projectors.

     

    Grey screens - There has been a lot of marketing hype about grey front projection screen materials which improve image contrast.  Unfortunately, with front projection, this results in a colour shift to the blue spectrum - not a problem with black and white projectors but can create ghastly problems with colour.  For example, skin tones have a green, sickly tinge.  Your whites will also be slightly off-white. So why do they sell, because when there is any ambient or reflected light in the room, it will absorb the reflected light and have an impact on perceived contrast more so than the contrast capability of the projector.
     

    Glass beaded screens have a higher gain however being retro reflective you will experience a dramatic loss of viewing angle and a loss of resolution. They are also mechanically unstable in that the beads can move or fall off entirely, creating very distinctive dark spots.

     

    Pearlescent screens have a higher gain, however colour shift to red occurs and there is a tendency to hot spot.  They also have a narrow viewing angle, are not readily available and are expensive due to high manufacturing costs

     

    Silver/Silver lenticular screens also provide a higher gain, however these screens will cause a colour shift to blue, have a smaller viewing angle and can hot spot.  These screens are great for old black and white, low power projectors but not suitable for contemporary projectors.  However, this material is still the best medium for 3D projection

     

    Screen Paint

     

    For the most flexible screen how about paint? If you don't like having to pull your screen up and down every time you want to watch a movie, or don't like the bands you get top and bottom when you watch a widescreen movie on a 4:3 screen (or left and right , watching a 4:3 movie on a 16:9 screen). Then how about painting the whole wall?

    Scream (Screen Cream) paint has the capacity to outperform most of the existing screen products in use today. The paint is made from the highest grade acrylic available. By far the most popular for home cinema is the White as it easily blends in with most decor, In more commercial spaces from Churches to Bars and clubs the Light grey is popular to boost contrast ratio. Image quality is very high and can be better than a screen (depending on surface and the ability of the painter). There is also a rear projection paint that can be applied to glass, eg a shop window. For paint it's quite expensive but still cheaper than most large screens.

    Features include:

    • Exceptional colour fidelity

    • Excellent gain with minimal hot spotting

    • Industry-leading horizontal and vertical off-axis characteristics

    • Easy single-step application

     

    Projectisle.com.au – “The Brands you know, Priced to go

     

    ______________________________________________________________

    HomeAbout UsContactLinksPayment OptionsPrivacy PolicyProjector Guide

    Site MapTerms & Conditions of SaleWarranty
     

     

    Projector and projector Lamp prices are in Australian dollars and include GST, unless otherwise stated.
    Prices and product availability can fluctuate and are subject to change without notice.

     

    Copyright © projectisle.com.au 2014
    All third party trademarks are hereby acknowledged

     

    projectisle.com.au Is Proudly Australian Australian Flag : ABN: 53 135 231 917