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Foot-Candle [fC]: A unit of illumination equal to the illumination which occurs when uniformly distributed
luminous flux is impinging on an area at a rate of one lumen per square foot.
Foot-Lambert [fL]: A unit of luminance equal to the uniform luminance of a perfectly diffusing surface
emitting or reflecting luminance flux at the rate of one lumen per square foot.
Front Porch: The portion of a composite display signal which lies between the leading edges of a horizontal
blanking pulse and the corresponding sync pulse.
Gray Scale: Variations in the luminance value of "white" light, from black to white. Shades of gray are
defined as gray-scale graduations that differ by the square root of 2.
Illuminance: The density of luminance flux impinging on a surface. It is the quotient of the flux divided by
the "apparent" or projected area of the surface.
Image: A displayed view of one or more objects or parts of objects.
Lambert: A unit of luminance equal to the uniform luminance of a perfectly diffusing surface emitting or
reflecting light at the rate of one lumen per square centimeter.
Luminance: Luminous intensity reflected or emitted by a surface in a given direction per unit of apparent
area. Measured in nits.
Lumen: The unit of luminous flux or rate of luminous energy flow. It is equal to the flux radiating through a
unit solid angle (steradian) from a uniform point source of one candela.
Luminous Flux: The time rate of luminous energy flow, measured by its capacity to evoke a visual sensation.
It is expressed in lumens.
Luminous Intensity: The luminous flux radiated by a point source. It is expressed in candela.
LUX: The international unit of illumination. One LUX equals one lumen per square meter.
MTBCF: Mean Time Between Critical Failure
Photometer Any optical device which uses a comparison technique to measure luminous intensity,
luminance, or illumination. An equality-of-brightness photometer is based on simultaneous comparison of
adjoining visual areas; a flicker photometer compares successive stimuli in the same visual area.
Resolution: The number of addressable, controllable display or picture elements, or the number of
hypothetical coordinate locations which can be used to position graphic elements on a display surface.
Shades of Gray: A division of the gray scale from black to white into a series of discrete luminance shades
with a square-root-of-2 difference between successive shades.
SVGA- Super Video Graphics Adapter
Sync: A contraction of synchronous or synchronization.
Tristimulus Value: See Chromaticity Value and Color Data .
VESA: Video Electronics Standards Association
VGA: Video Graphics Adapter
Title: Engineering Specification: 12.1-inch AMLCD Monitor
Document Number: 023-0284-00
Page 25 of 27
Revision: A
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