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Industry Terms
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Industry Terms
A B C D E F G H I J K L M N
O P Q R S T U V W X Y Z
Data Rate
Depth of Focus
Device Driver
Diagonal Screen
Digital Compression
Digital Light Processing (DLP)
Digital Signal Processors (DSP's)
Digital Video
Digitize
Disk Pad
Display
Display Size
Distortion
Distribution Amplifier
Dithering
DLP
DMD Technology
DSTN
Dual Scan Passive Matrix
Dynamic Range
Data Rate [top]
The rate or speed at which data is transmitted, usually stated in bits per second or Baud.
Depth of Focus [top]
The ability of an imaging system to keep an image in focus when the object plane is NOT thin.
Device Driver [top]
Software that allows a computer to communicate with an internal or external peripheral device, such as a printer, scanner or CD-ROM player.
Diagonal Screen
[top]
The method of measuring the size of a computer or television image. Measured from one corner to the diagonally opposite corner, a 9 FT high by 12 FT wide projected image has a diagonal of 15FT. Typically, in computer and video we assume that the diagonal dimensions are for the traditional 4:3 aspect ratio as in the previous example. Remember, the 4:3 aspect ratio is standard for Video and computer images, but some screens are square, others particularly wide.
Digital Compression [top]
Encoding data or digital information to use less storage space or to require less bandwidth for efficient transmission.
Digital Light Processing (DLP)
[top]
The name for a new technology from Texas Instruments: The technology inside is sometimes referred to as either "micro-mirrors", or DMD: It works in the same way ancient people used to signal each other by flashing sunlight off mirrors. However the modern version replaces the sun with a powerful lamp and uses hundreds of thousands of rotating mirrors, lined up in 800 rows of 600 mirrors each. Attach each of those 480,000 hinges to its own motor. The motors tilt their mirrors up to 20 degrees at incredible speeds. allowing the mirrors to modulate light from the lamp, and send the "modulated signal" out through a lens, on to a screen. Now comes the hard part - The 480,000 mirrors (actually 580,000 are used), hinges and motors are packed onto a "wafer" a bit larger than your thumbnail.
Digital Signal Processors (DSP's) [top]
A specialized digital microprocessor that performs calculations on digitized signals that were originally analog and then sends the results.
Digital Video [top]
Video where all the instructions for the images are in computer data form, i.e. bits.
Digitize
[top]
Process of converting analog information into digital information.
Disk Pad [top]
A device used to control movement of an icon (such as a cursor) across an image. A disk pad controls movement of the cursor by making it move in the direction corresponding to the part of the disk you press down on (relative to the center.) To clarify, press down on the disk at 2 o'clock, and the cursor will move on in that direction (toward the upper right) from wherever it had been.
Display [top]
A screen that electronically presents numbers, characters, graphics, etc. transmitted from a personal computer.
Display Size [top]
Display size is the diagonal size of an image display device. Typical laptop LCD sizes are 8.4" to 12.1" measured diagonally.
Distortion [top]
An undesired modification of the original signal appearing in the output. Distortion can be caused by improper setup or poor quality equipment. Distortion appears as ghosting or off color images, or is heard as muffled or crackling sound.
Distribution Amplifier [top]
An amplifier used to maintain a clean noise free signal to the projector over significant distances. Even with heavily shielded cables, the range of video and computer signals is limited to a few dozen feet before noticeable degradation. Often projection using ceiling mounted equipment, a distribution amp may be needed even with shorter distances to eliminate the interference caused by electric conduits and equipment in the ceiling near the signal cable. Many distribution amps can also split the signal into 2 or more amplified signals for driving multiple projectors, projectors and monitors.
Dithering [top]
The method of mixing up neighboring pixels or consecutive frames of pixel information in a random fashion to create the effect of many intermediate levels of color.
DLP [top]
see Digital Light Processing
DMD Technology [top]
see Digital Light Processing
DSTN [top]
Double Super Twist Nematic. A process where two separate LCD plates are combined to form a single panel.
Dual Scan Passive Matrix [top]
Newer version of the original passive matrix technology, where the screen is controlled by two processing systems. A faster than "single scan", response is still not as fast as active matrix. Not recommended for multimedia or video applications. Dual scan is used in the least expensive LCD panels.
Dynamic Range [top]
The ability to "reproduce" the full range of an inputted signal. If that range is limited, it will be difficult to distinguish between pure white and the lightest grays. Subtle details disappear without adequate dynamic range. See also "color dynamics"
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