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.
Brightness
A viewer's subjective response to luminance.
Contrast ratio
The numeric relationship between the brightness and the darkest portions of a Displaying expressed in foot-Lamberts as a ratio of Max:Min.
Drop
The area between the top, or the bottom, of the viewing area and 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 from luminance transmitted by the screen, divided by the luminance radiating the projector.
HDTV
High Definition Television in ratio 16 : 9
Keystone
The distortion of the projected image when the screen is not perpendicular with the center line of the projected image.
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.
Masking borders
The black portion surrounding the viewing area of a screen.
Projection axis
The direction of an imaginary line extending from the center of the projection lens through the screen's center.
Throw distance
The length of the projection beam necessary for a particular projector to produce an image of a specified size.
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.
LCD
Light Charged Device. Save Technology used in TV and computer monitors.
DLP
Digital Light Panel. Adopted Texas Instrument IC Chip called "Digital Mirror Device" to achieve true colors image used in DLP Projector.
Video Format
Screen format in ratio 4:3