display devices display device: output device that presents output visually monitor/display screen:...
TRANSCRIPT
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Display Devices
• Display device: output device that presents output visually
• Monitor/Display screen: The display device used with desktop computers, notebook computers, handheld PCs, smart phones, consumer devices, and many other devices
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Display Device Characteristics
• Usually color, but can be monochrome
• Can be a CRT monitor or a flat-panel display
– CRT monitor: projects images onto a display screen using technology similar to that of TVs
– Flat-panel display: forms images by manipulating electronically charged chemicals or gases sandwiched between thin panes of glass or a liquid crystal. Popular flat panels displays are Plasma screens and LCD screens.
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CRT vs. Flat-Panel Monitors
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Display Device Characteristics, Cont’d
• Size (measured diagonally)
• Screen resolution – Can be changed– Higher resolution = more data on the screen
at one time
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Display Device Characteristics, Cont’d
• Video card (determines display characteristics and how monitor can connect to the PC)
• Monitors can be also be:– Wired or wireless– 2D or 3D Displays– Digital TV and/or HDTV ready or capable
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Flat-Panel Display Technologies
• Liquid crystal displays (LCDs): use charged liquid crystals to display images
• Organic light emitting diode (OLED) displays: use emissive organic material to display brighter and sharper images
• Plasma displays: use layers of gas to display images; most often used on large displays
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Flat-Panel Display Technologies, Cont’d
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Monitors - Comparing Monitors
When comparing monitors, consider four features:
• Size
• Resolution
• Refresh rate
• Dot pitch
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Comparing Monitors - Size
• A monitor's size is the diagonal measurement of its face, in inches.
• For years, 15" monitors (13"viewing area) were standard.
• Today, 17" monitors (15" viewing area) are common.
• Larger monitors are available, but can be expensive.
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The diagonalsize (often 15”)
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Comparing Monitors - Resolution
• Resolution is the number of pixels on the screen, expressed as a matrix (such as 600x800).
• A 17" monitor offers resolutions from 640x480 up to 1280x1024.
• The Video Graphics Array (VGA) standard is 640x480. Super VGA (SVGA) monitors provide resolutions of 800x600, 1024x768 or higher.
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Resolution (image sharpness) is important.
(Especially for graphics, page layout, and CAD)
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Comparing Monitors - Refresh Rate
• Refresh rate is the number of times each second that the electron guns scan the screen's pixels.
• Refresh rate is measured in Hertz (Hz), or cycles per second.
• Look for a refresh rate of 72 Hz or higher. A slower rate may cause eyestrain.
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Fast scanning = Quick refresh (less flicker)
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Comparing Monitors - Dot Pitch
• Dot pitch is the distance between the phosphor dots that make up a single pixel.
• In color monitors, three dots (red, green, and blue) comprise each pixel.
• Look for a dot pitch no greater than .28 millimeter.
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Fine dot pitch = Crisp displays
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Monitors - Video Controllers
• The video controller is an interface between the monitor and the CPU.
• The video controller determines many aspects of a monitor's performance, such as resolution or the number of colors displayed.
• The video controller contains its own on-board processor and memory, called video RAM (VRAM).
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VRAM
Graphic intensive applications suchas games require plenty of VRAM.
Video Control Board with Monitor Cable
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Data and Multimedia Projectors
• Data projector: display device that projects all computer output to a wall or projection screen
• Most data projectors today can project video, in addition to computer output.
• Can be wireless projectors
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Printers
• Printer: output device that produces output on paper
– Produce hard copy
– Can be used with both desktop and portable PCs
• Printer characteristics
– Impact vs. nonimpact printing
• Most printers are nonimpact
• Impact printers (like dot-matrix printers) are still used for printing multipart forms and shipping documents
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Printers
• Printer characteristics, cont’d– Can print in color or black-and white– Can be a personal or network printer– Quality is called print resolution and measured
in dots per inch (dpi)– Print speed is measured in pages per minute
(ppm)
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Laser Printers
Laser printer: output device that uses toner powder and technology similar to that of a photocopier to produce images on paper
The standard for business documents
Print one entire page at a time
Usually black and white, though color printers are available
Common print resolution for laser printers is between 600 and 2,400 dpi
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Ink-Jet Printers• Ink-jet printer: output device that sprays droplets of
ink to produce images on paper
• Typically print in color
• Often the choice for home use
• Print fairly slowly, one line at a time
• Quality not quite as good as a laser printer
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Special Purpose Printers
• Photo printers (designed to print photographs)
• Barcode printers (print barcodes)
• Label printers (print labels, electronic postage, etc.)
• Portable printers (designed to be carried with you)
• Plotters and wide-format ink-jet printers (print on large paper or other large materials)
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Multifunction Devices
• Multifunction device: device that offers some combination of printing, copying, scanning, and faxing capabilities
• Most commonly, these types of devices are based on color ink-jet printer technology, although laser multifunction devices are available
• Advantage: takes up less space and is less expensive than purchasing multiple machines
• Disadvantage: Lose all devices if it needs to be repaired
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Audio Output
• Audio output: output in the form of voice or music
• Speakers: connect to a PC and provide audio output for computer games, music, video, TV, videoconferencing, and other applications that have audio output
• Voice output systems: produce spoken output