Hours:
13 Glossary of Terms
Aspect Ratio: The ratio of width to height of a display surface. The standard television aspect ratio is 4:3.
Back Porch: The portion of a composite display signal which lies between the trailing edges of a horizontal sync pulse and the corresponding blanking pulse.
Black Level: The
Blanking: The process of decreasing (or increasing) the
Blanking Level: The level of a composite display signal which separates the range containing display information from the range containing synchronizing information. Also called the pedestal level, or
Brightness: A
Chrominance: The colorimetric difference (dominant wavelength and purity) between any color and a reference "white" of equal luminance. In
Chromaticity: The color quality of light which is defined by its dominant wavelength and purity (see Chrominance).
Chromaticity Value: The scalar value of any one component of a
Color Saturation: A
Color Temperature: The temperature to which a black body must be heated to produce a color matching that of the source.
Contrast: The ratio between the maximum and minimum luminance values of a display.
dB (Decibel): A measure of the ratio of two signals. The dB value is 20 x log10 of a voltage or current ratio or 10 x log10 of a power ratio.
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
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.
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