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Glossary Of
Terms |
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Ambient light |
All light in a
viewing room produced by sources other than the screen. |
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Aspect ratio |
The numeric
relationship between a screen's height and width. |
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Brightness |
A viewer's subjective response to luminance. |
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Contrast ratio |
The numeric relationship between the
brightness and the darkest |
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portions of a Displaying expressed in
foot-Lamberts as a ratio of Max:Min. |
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Drop |
The area between the top, or the bottom, of
the viewing area and the |
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screen housing. |
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Foot-candle |
The fundamental unit of illumination
representing the light intensity over a |
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1 square foot surface which is 1 foot away
from a standard candle. |
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Foot-lambert |
A unit of luminance equivalent to 1 lumen
per square foot. |
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Gain |
A measurement usually made perpendicular to
screen center of the from |
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luminance transmitted by the screen, divided
by the luminance radiating |
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the projector. |
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HDTV |
High Definition Television in ratio 16 : 9
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Keystone |
The distortion of the projected image when
the screen is not |
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perpendicular with the center line of
the projected image. |
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Lenticular |
Screen surface comprised of a geometric
embossing pattern. The shape |
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of the pattern affects view\angle
performance and reflection of ambient |
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light. |
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Luminance |
The measured brightness of a screen,
expressed in foot-lamberts. |
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Masking borders |
The black portion surrounding the viewing
area of a screen. |
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Projection axis |
The direction of an imaginary line extending
from the center of the |
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projection lens through the screen's
center. |
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Throw distance |
The length of the projection beam necessary
for a particular projector to |
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produce an image of a specified size. |
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Viewing angle
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The angle from a specified viewing position
to the center of the screen. It |
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is usually measured on the horizontal or on
the vertical axis. |
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LCD |
Light Charged Device. Save Technology used
in TV and computer |
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monitors. |
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DLP |
Digital Light Panel. Adopted Texas
Instrument IC Chip called "Digital |
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Mirror Device" to achieve true colors image
used in DLP Projector. |
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Video Format |
Screen format in ratio 4:3 |
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