( 
)Complete Audio Visual Terms Glossary with Definitions! Thank goodness someone has one right? We thought here at ProjectorScreenCental that you would like to know what all these tech terms mean. So we have a guide for all the terms below.
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TERMS:
Ambient Light
All light in a viewing room produced by sources other than the screen.
Aspect Ratio
The numeric relationship between a screen's height and width. This ratio is often defined by the selected projection medium. Hence, NTSC Video (U.S. television) has an aspect ratio of 3:4.
Bend Angle
The angle through which a projected light ray must be diverted from its original path to reach a viewer's eyes.
Borders
The black portion surrounding the viewing area of a screen.
Brightness
A viewer's subjective response to luminance.
Contrast Ratio
The numeric relationship between the brightest and the darkest portions of a display expressed in foot-lamberts as a ratio of Max:Min.
CRT
Cathode Ray Tube. Same technology used in TV and computer monitors.
DLP
This technology is based on the Digital Micromirror Device™ (DMD™) which uses over 500,000 microscopic mirrors on the SVGA chip to reflect images on screen.
Drop
The area between the top of the viewing area and the bottom of the screen housing.
Foot-Candle
The fundamental unit of illumination representing the light intensity over a 1 square foot surface which is 1 foot away from a standard candle.
Foot-Lambert
A unit of luminance equivalent to 1 lumen per square foot.
Gain
A measurement usually made perpendicular to screen center of the luminance transmitted by the screen, divided by the luminance radiating from the projector.
HDTV
Acronym for High Definition Television
Keystone
The distortion of the projected image when the screen is not perpendicular with the center line of the projected image.
LCD
Liquid Crystal Display. Commonly used in digitized projection.
Lenticular
Screen surface comprised of a geometric embossing pattern. The shape of the pattern affects view\angle performance and reflection of ambient light.
Luminance
The measured brightness of a screen, expressed in foot-lamberts.
Projection Axis
The direction of an imaginary line extending from the center of the projection lens through the screen's center.
SVGA
Super Video Graphic Array. Common computer screen resolution. (800 x 600)
Throw Distance
The length of the projection beam necessary for a particular projector to produce an image of a specified size.
VGA
Video Graphic Array. Common computer screen resolution. (640 x 480)
Viewing Angle
The angle from a specified viewing position to the center of the screen. It is usually measured on the horizontal or on the vertical axis. Specified in this guide as optimum screen brightness from screen center to either side.
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Terms: Courtesy of Dalite. We are a worldwide authorized dealer for Dalite. Reproduced with permission.
Screen Surfaces Glossary <click on links below to take you to all our screens with that fabric type>
The most versatile screen surface and the premier choice when ambient light is controllable. It evenly distributes light over a wide viewing area while colors remain bright and life-like, with no shifts in hue. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 60°
Gain: 1.0
Designed for moderate output DLP and LCD projectors, this screen surface is a great choice when video images are the main source of information being projected and where ambient light is moderately controlled. With its specially designed gray base material and reflective top surface, this screen material is able to provide very good black levels without sacrificing the white level output. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 50°
Gain: 1.1
Especially designed for demanding video and overhead LCD projection applications where a balance of higher gain and greater viewing angle is required. The special pearlescent surface may be cleaned with mild soap and water. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 35°
Gain: 1.5
A uniquely designed screen surface with a specifically designed silver finish. This surface is perfect for situations where a silver surface is necessary for a polarized 3-D projection. The matte finish of this surface successfully rejects ambient light. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 30°
Gain: 1.3
This surface has the ability to achieve a higher gain by reflecting more of the projected image back along the projection axis. Glass beads impregnated into the screen's surface provide additional reflectance. This attribute creates an unparalleled screen surface that reproduces vibrant life-like color at moderate viewing angles. Flame retardant and mildew resistant.
Viewing Angle: 30°
Gain: 2.5
A technological breakthrough, combines the reflectivity of a glass beaded surface with the ability to clean the surface when required. Its smooth surface offers the highest gain of all types of screen surfaces with moderate viewing angle. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 25°
Gain: 2.8
A smooth, white, vinyl finish surface for precise image reproduction. Provides an exceptionally wide angle of view with little loss of resolution. It is a highly flexible unsupported vinyl fabric and may be folded or rolled. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 60°
Gain: 1.0
A smooth, gray, vinyl finish surface for high output LCD and DLP projectors. This surface improves the perceived contrast by lowering black levels. It is a flexible unsupported vinyl fabric and may be folded or rolled. Available on all models offered with the Da-Mat™ surface. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 45°
Gain: 0.8
A unique unsupported vinyl surface that offers a bright, uniform image with no color shift no matter at what angle you view the image. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 45°
Gain: 1.3
A smooth, gray, vinyl finish surface for moderate output DLP projectors. This surface improves the perceived contrast by lowering black levels while offering moderate gain. It is a flexible unsupported vinyl fabric and may be folded or rolled. Available on all models offered with the Cinema Vision surface. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 50°
Gain: 1.1
With the same optical characteristics as High Contrast Cinema Vision, this surface is perforated to allow placement of a center channel speaker behind the screen surface while allowing the sound to transmit through the material. Ideal for use in environments with moderate control of ambient light. Screen surface can be cleaned with a mild soap and water solution. Flame retardant and mildew resistant.
Viewing Angle: 50°
Gain: 1.1
This surface utilizes an unsupported vinyl creating a very smooth Pearlescent coating that provides high reflectivity and brilliance without loss of image quality or resolution. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 40°
Gain: 1.5
This screen surface is uniquely designed with a specially formulated silver finish. This surface is perfect for situations where a silver finish is necessary for polarized 3-D projection. The silver finish of this surface successfully rejects ambient light. It is a highly flexible fabric that must be tensioned. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 25°
Gain: 1.5
This acoustically transparent front projection screen allows for the center channel speaker to be placed directly behind the screen while still transmitting the full range and brilliance of an original soundtrack with maximum clarity. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 50°
Gain: 1.0
With the same optical characteristics as the High Contrast Da-Mat material, this surface is designed to provide the viewer with a more realistic soundstage by placing speakers behind the screen and allowing the sound to be transmitted through the material. This screen surface is best used when there is good control of ambient lighting and a moderately wide viewing angle is desired. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 45°
Gain: 0.8
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