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Output Devices
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CHAPTER 2 : COMPUTER DEVICE
PART 2 : OUTPUT DEVICES
Objectives
Describe the four categories of outputDescribe the four categories of output
Summarize the characteristics of LCD monitors,
LCD screens, plasma monitors, and CRT monitors
Summarize the characteristics of LCD monitors,
LCD screens, plasma monitors, and CRT monitors
Differentiate between a nonimpact printer and an
impact printer
Differentiate between a nonimpact printer and an
impact printer
Describe the uses of speakers, headphones,and earphones
Describe the uses of speakers, headphones,and earphones
Identify output options for physically challenged users
Identify output options for physically challenged users
Summarize the characteristics of ink-jet printers, photo printers, laser printers, thermal printers,
mobile printers, label and postage printers,and plotters and large-format printers
Summarize the characteristics of ink-jet printers, photo printers, laser printers, thermal printers,
mobile printers, label and postage printers,and plotters and large-format printers
What is Output?What is output? Data that has been processed into a useful form
Output device is any hardware component that can convey information to one or more people
Display DevicesWhat is a display device? Output device that visually conveys text,
graphics, and video information Information on display device sometimes
called soft copy Monitor houses display device that is packaged
as separate peripheral
Display DevicesWhat is an LCD monitor? Uses liquid crystal display Has a small footprint Mobile devices that contain
LCD displays include Notebook computer, Tablet
PC, ultra personal computer, portable media player, smart phone, and PDA
Display DevicesWhat about using multiple LCD monitors? Some users position
two or more monitors side-by-side or stacked
Allows users to run multiple applications simultaneously
Display DevicesWhat are some mobile devices that have LCD screens?
Factors Affect the Quality of an LCD Monitor/Screen
1) Resolution • The number of horizontal and vertical pixels in a display device. Eg: a monitor that
has a 1440 x 900 resolution displays up to 1440 pixels per horizontal row and 900 per vertical row.
• Higher resolution used a greater number of pixels and provides a smoother, sharper and clearer image.
• 19 inch LCD monitor/screen has a resolution of 1440 x 900 while 22 inch has a resolution of 1680 x 1050.
2) Response Time • LCD monitor/screen is the time in milliseconds (ms) that takes to turn a pixel on or
off.• LCD monitors’/screens’ response time range from 3 to 16 ms. The lower number,
the faster the response time.
Factors Affect the Quality of an LCD Monitor/Screen
3) Brightness • Brightness of LCD monitor/screen is measured in nit. Nit is a unit of visible light
intensity.• LCD monitor/screen today range from 250 to 550 nits. The higher the nits the
brighter the images..4) Dot pitch • Also called pixel pitch, is the distance in millimeters between pixel on a display
device. Text created with smaller dot pitch is easier to read.• Average dot pitch on LCD monitors and screens should be 0.30 mm or lower. The
lower number the sharper the image.5) Contrast ratio • Describes the difference in light intensity between the brightest white and darkest
black that can be displayed on LCD monitor.• Contrast ratio today range from 500:1 to 2000:1. Higher contrast ratio represents
colors better.
Display DevicesWhat is a plasma monitor? Displays image by applying voltage to layer of gas
Larger screen size and richer colors than LCD, but are more expensive
Display DevicesWhat is a CRT monitor? Contains cathode-ray
tube (CRT) Screen coated with tiny
dots of phosphor material Each dot consists of a red,
blue, and green phosphor Common sizes are 15, 17,
19, 21, and 22 inches Viewable size is diagonal
measurement of actual viewing area
PrintersWhat is a printer?
p. 310 Fig. 6-11
Output device that produces text and graphics on a physical medium
Result is hard copy, or printout
Two orientations: portrait and landscape
portrait
landscape
SpeedSpeedSpeedSpeed
PrintersHow do you know which printer to buy?
BudgetBudgetBudgetBudget Color orColor orblack and whiteblack and white
Color orColor orblack and whiteblack and white
Cost per pageCost per pageCost per pageCost per page Paper typesPaper typesand sizesand sizes
Paper typesPaper typesand sizesand sizes
Graphics and Graphics and photo printingphoto printingGraphics and Graphics and photo printingphoto printingMultiple copiesMultiple copiesMultiple copiesMultiple copies
SystemSystemcompatibilitycompatibility
SystemSystemcompatibilitycompatibility
Depends on printing needs
WirelessWirelesscapabilitycapabilityWirelessWireless
capabilitycapabilityFuture needsFuture needsFuture needsFuture needs
PrintersWhat are the various ways to print documents
and pictures?
PrintersWhat is a nonimpact printer? Forms characters and graphics without striking paper
Ink-jet printer sprays tiny drops of liquid ink onto paper Prints in black-and-white or color on a variety
of paper types
PrintersWhat is the resolution of a printer? Sharpness and clarity Measured by number of dots per inch (dpi) printer
can output
PrintersWhat is a photo printer? Color printer that produces photo-lab-quality
pictures Many photo printers have a built-in card slot PictBridge is a standard technology that allows you to
print pictures directly from a digital camera
PrintersWhat is a laser printer? High-speed, high-quality
nonimpact printer Prints text and graphics
in high-quality resolution, ranging from 1,200 to 2,400 dpi
Typically costs more than ink-jet printer, but is much faster
PrintersWhat is a thermal printer? Generates images by
pushing electrically heated pins against heat-sensitive paper Dye-sublimation printer
(also called a digital photo printer) uses heat to transfer dye to specially coated paper
PrintersWhat is a mobile printer? Small, lightweight, battery-powered printer that allows
mobile user to print from notebook computer, Tablet PC, smart phone, or other personal mobile device while traveling
PrintersWhat are label printers and postage printers? Small printer that prints on adhesive-type material
Postage printer has built-in digital scale and printspostage stamps
Most also print bar codes
PrintersWhat is a plotter? Sophisticated printer used to produce high-quality
drawings Large-format printer creates photo-realistic-quality
color prints
PrintersWhat is a dot-matrix printer? Impact printer that produces printed images
when tiny wire pins strike ribbon Impact printer forms
characters by striking mechanism against inked ribbon that contacts paper
PrintersWhat is a line printer? High-speed impact printer
that prints entire lineat a time
Speed measured in lines per minute (lpm) Band printer prints fully
formed characters using a hammer mechanism
Shuttle-matrix printer is high-speed printer that works like dot-matrix printer
Speakers, Headphones, and EarphonesWhat is an audio output device?
p. 320 - 321 Figs. 6-26 – 6-28
Computer component that produces music, speech, or other sounds
Speakers and headsets are common devices
Other Output DevicesWhat is a facsimile (fax) machine? Device that transmits and receives documents over
telephone lines Converts an original document into a digitized image Many computers include fax capability
Other Output DevicesWhat is a fax modem? Modem that allows you to send and receive electronic
documents as faxes
Other Output DevicesWhat is a multifunction peripheral? Provides functionality
of printer, scanner, copy machine, and fax machine
Other Output DevicesWhat is a data
projector? Device that takes text and images from computer screen and projects them onto larger screen
DLP projector LCD projector
Other Output DevicesWhat is an interactive
whiteboard? Touch-sensitive device
that displays the image on a connected computer screen
SMART board
Other Output DevicesWhat is force feedback? Sends resistance to
device in response to actions of user
Multifunction peripheralsMultifunction peripherals
Summary of Output
Display devicesDisplay devices
PrintersPrinters
Speakers, headphones, and earphonesSpeakers, headphones, and earphones
Fax machines and fax modemsFax machines and fax modems
Data projectorsData projectors
Interactive whiteboardsInteractive whiteboards
Force feedback joysticks, wheels, and gamepads
Force feedback joysticks, wheels, and gamepads