Справочник Пользователя для Draper Luma 207121

What is Gain?—

Gain is a measure of brightness as compared to a block of magnesium carbonate, which serves as the 

industry’s standard for gain of 1 .0 . A more familiar “real-world” comparison is with a matt white projection screen . Most matt white 
screens have a fairly uniform light distribution pattern with gain of approximately 1 .0 . Screens that appear brighter on axis are 
concentrating reflected light in a narrower area: the gain may be 2 .5 on axis but 0 .5 at 60° to the side . With today’s brighter, high output 
projectors, gain is not as important as it once was because the screen no longer has to make up for a lack of projector brightness . Other 
factors—such as color contrast and accuracy, uniformity, reproduction of black and the ability to perform with more ambient light in 
the audience area—are equally important .

Rigid Rear Projection Screens

Draper offers several distinct types of rear projection 
screens—traditional diffusion and optical screens, an 
exclusive IRUS technology, and high contrast technology .

 are a transparent substrate, either 

glass or acrylic, with a permanently bonded diffusion medium . The 
diffusion medium distributes projected light and creates a uniform 
high-resolution reproduction of the projected image . Cinescreen, 
Draper’s diffusion rear screen, is unique among rear screens 
because its diffusion medium consists of both an optical coating 
and an optical tint—each formulated for specific requirements . 
(Optical coatings and optical tints are described on page 60) .

The advantages of diffusion screens are superior clarity 
of image and availability in extremely large sizes . The 
disadvantage, in many settings, is that the diffusion medium 
is omnidirectional—as much light is refracted toward the floor 
and ceiling as left and right . However, this characteristic can 
be an advantage in a room with a tiered seating pattern .

Draper’s Cinescreen differs from any other rigid rear projection 
screen in two extremely important respects . Cinescreen 
optical coatings provide inherent abrasion resistance . No 
other manufacturer offers you this protection . Only Draper 
offers you a choice of six different optical coatings, each 
available in your choice of three unique optical tints . With a 
Draper Cinescreen, you can select the optimum combination 
of optical coating and tint based upon your projection 
equipment, audience seating pattern, desired contrast 
level, screen aspect ratio, ambient light level and aesthetic 
considerations . Only Draper offers you this versatility .

Draper uses the finest plate glass and clear acrylic as 
Cinescreen substrates . Virtually identical optical qualities .

· Cineglass®—Recommended for maximum sound 

isolation, scratch resistance and service life . Weighs 
approximately twice as much as acrylic, breaks more 
easily, must be installed by a glazier . Recommended for 
sizes above 7 1⁄2' x 10' or multiple projection installs .

· Cineplex®—Lightweight, durable and break resistant . 

Easier to install . Requires more care in cleaning, as acrylic 
scratches more  easily than glass . Less soundproof than 
glass . Not recommended for multiple projection installs .

When ordering a Cinescreen, we need to know the following:

· Dimensions
· Substrate
· Thickness
· Optical coating
· Tint
· If ArmorKote® or NonGlare is required
· If factory-installed framing is required (specify 

framing system number and finish)

are made of cast acrylic, 

incorporating a Fresnel lens on the projector side . The Fresnel 
lens gathers the light from the projector and refracts it 
directly through the screen . Optical screens are a necessity 
for multiple screens in the same room or videowalls . 

• Vortex—Draper’s Vortex screen combines light diffusion and 

anti-reflectance agents with a Fresnel lens for excellent contrast 
and edge-to-edge uniformity . Vortex provides maximum light 
distribution of up to 180° in both the horizontal and vertical planes . 
Screen gain is 2 .0 vertical and horizontal half-gain angle is 20° .

• DiamondScreen™—Draper’s DiamondScreen is the first 

rear projection screen designed specifically for video and 
data projection . With a DiamondScreen, you can expect the 
brightest rear screen image in the world—3 .5 gain on axis . 
The DiamondScreen has a panoramic 180o horizontal viewing 
cone and the largest vertical viewing cone of any product of 
its type . The High Contrast Grey optical tint provides superior 
color contrast, and its anti-reflectance properties gives superior 
performance even under conditions of high ambient light . The 
DiamondScreen features superior corner-to-center brightness 
with no “hot spots .” Also available in 1 .5 gain by quotation .

• High Contrast Black—Super high contrast black rear screen with 

single lens for videowall and other demanding requirements . 
Provides vivid color contrast under any ambient lighting condition 
with excellent viewing angles . Available by quotation only.

The Draper IRUS—Infinite Resolution 

Uniformity Screen—is specifically designed to provide maximum 
legibility with any projector . Today’s projectors offer higher 
resolution than ever before—and that means more information 
for your audience to absorb . The IRUS is up to the challenge . In 
order to convey an increasing amount of information to the viewer, 
the IRUS uses proprietary technology to display the sharpest, 
most uniform image you’ve ever seen . An improvement for 
every rear screen application, the IRUS actually provides higher 
resolution than the human eye can perceive . The image is so 
consistent that it can be clearly perceived even at 90° off axis . 

This section also contains a 

number of products that use rear projection to convey and enhance 
presentations and diplays . See pages 62-64 for more information .