Display Processors and hard copy devices

Display Processor of Computer Graphics






The display processor is used to convert digital information from the CPU into analog value needed by the display device. This digital-analog conversion depends on the type of display devices used and the particular graphics functions that are to be hardware implemented. For many graphics monitors, the coordinate origin is defined at the lower left screen corner.
A major task of display processor is to perform a procss called scan conversion. It is the process of separating contigous graphics objects as a collection of ellipcs, rectangles and polygons.
The display processor also designed to perform a number of additionaloperations. These functions include various line style(dashed, dotted, solid), displayinf color area and so on. Also designed to interface with interactive input devices such as mouse. Sometimes the display processor in a random graphics system is referred to as a display processing unit or a graphic controller.

Hard copy devices of Computer Graphics

Every CAD system needs to provide hardcopy versions of circuits. Whether on paper or film, the permanent image is useful for offline consideration and for documentation. Although hardcopy graphics techniques are essentially the same as those found in display programming, there are other considerations. As a first step, it is necessary to understand the nature of these plotting devices.

Like displays, plotters fall into two broad categories: raster and calligraphic. Raster devices such as laser and ink-jet printers cover every pixel on the page and can produce arbitrarily complex images. Calligraphic devices such as pen plotters and some film recorders have a single writing head that must be moved to draw.

Unlike displays, the intensity resolution of plotters is generally low. Many hardcopy devices are strictly bilevel, able only to plot a black dot or to leave the spot white. Color printers have additional sources of ink but can still place the inks with only one intensity. Pen plotters can sometimes fake intensity by drawing over an area multiple times, but there is a limit to what the paper can endure, so these plotters still have only a few intensity levels. Essentially, the variations of layer appearance must be faked with patterned areas.

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