Chapter 6
LCD monitors and screens range from
250 to 550 nits. the higher the nits, the brighter the images.
best analog televisions have a resolution of only
50 x 400 pixels.
portrait orientation
A printout that is taller than it is wide, with information printed across the shorter width of the paper.
landscape orientation
A printout that is wider than it is tall with information printed across the widest part of the paper.
output device
Any hardware component that conveys information to one or more people.
headphones
Audio output device that covers or is placed outside the ear.
earbuds
Audio output device that rests inside the ear canal.
speakers
Audio output devices that generate sound.
voice output
Audio output that occurs when a user hears a person's voice or when a computer talks to the user through the speakers on the computer.
graphics processing unit (GPU)
Chip that controls the manipulation and display of graphics on a display device.
audio output device
Component of a computer that produces music, speech, or other sounds, such as beeps.
aspect ratio
Defines a display's width relative to its height. The aspect ratio for widescreen monitors is 16:10.
LCD monitor
Desktop monitor that uses a liquid crystal display instead of a cathode-ray tube to produce images on a screen, resulting in a sharp, flicker-free display.
headset
Device that functions as both headphones and a microphone.
viewable size
Diagonal measurement of the actual viewing area provided by the screen in a CRT monitor.
contrast ratio
Difference in light intensity between the brightest white and darkest black that can be displayed on an LCD monitor. Contrast ratio range from 500:1 to 2000:1. Higher contrast ratios represent colors better.
Digital Video Interface (DVI) port
Digital Video Interface; video card port that enables digital signals to transmit directly to an LCD monitor.
Internet postage
Digital postage technology that allows users with an authorized postage account to buy and print digital postage.
monochrome
Display device capability in which information appears in one color on a different color background.
monitor
Display device that is packaged as a separate peripheral.
plasma monitor
Display device that uses gas plasma technology, which sandwiches a layer of gas between two glass plates. When voltage is applied, the gas releases UV light; this UV light causes the pixel on the screen to glow and form an image.
flat-panel display
Display device with a shallow depth and flat screen that typically uses LCD or gas plasma technology.
head-mounted display (HMD)
Display that uses OLED technology in a helmet, goggles, or glasses.
tactile output
Feature included with some input devices that provides the user with a physical response from the device.
active matrix display
LCD monitor or screen technology that uses a separate transistor to apply charges to each liquid crystal cell and thus displays high-quality color that is viewable from all angles. Also called TFT (thin-film transistor display).
Passive-matrix display
LCD monitor or screen technology that uses fewer transistors, requires less power, and is less expensive than an active-matrix display.
cathode-ray tube (CRT)
Large, sealed glass tube whose front, the screen, is coated with dots of red, green, and blue phosphor material. Inside the CRT, an electron beam moves back and forth across the back of the screen.
printers
Output device that produces text and graphics on a physical medium such as paper.
data projector
Output device that takes the text and images displaying on a computer screen and projects them on a larger screen so an audience can see the image clearly.
display device
Output device that visually conveys text, graphics, and video information.
High Definition Media Interface (HDMI) port
Port that combines DVI with high-definition (HD) television and video.
DisplayPort
Port that is an alternative to DVI that also supports HDMI.
hard copy
Printed information that exists physically and is a more permanent form of output than that presented on a display device (soft copy). Also called a printout.
near letter quality (NLQ)
Printer output that is slightly less clear than what is acceptable for business letters. Use for printing labels. Used by factories, warehouses, and retail because withstand dust, vibrations, extreme temperatures.
dots per inch
Printer resolution measurement of the number of dots a printer can print. with an ink-jet printer, a dot is a drop of ink. Higher dip means the drops of ink are smaller.
large-format printer
Printer that creates photo-realistic quality color prints, used mainly by graphic artists. Potter and large format printers can accommodate paper with widths up to 98 inches for blueprints, maps, signs.
infrared printing
Printing that uses infrared light waves to transmit output to a printer.
LDC projector
Projector that uses liquid crystal display technology that attaches directly to a computer and uses its own light source to display the information shown on the computer screen.
digital light processing (DLP) projector
Projector that uses tiny mirrors to reflect light, which produces crisp, bright, colorful images that remain in focus and can be seen clearly, even in a well-lit room.
label printers
Small printer that prints on adhesive-type material that can be placed on items such as envelopes, packages, optical discs, photos, file folders, and toys.
mobile printer
Small, lightweight, battery-powered printer used by a mobile user to print from a notebook computer, smart phone, or other mobile device while traveling.
page description language (PDL)
Software that tells a printer how to lay out the contents of a printed page.
plotter
Sophisticated printers that produce high-quality drawings such as blueprints, maps, and circuit diagrams using a row of charged wires (called styli) to draw an electrostatic pattern on specially coated paper and then fuse toner to the pattern.
subwoofer
Speaker component that boosts low bass sounds.
satellite speakers
Speakers positioned around one or two center speakers and positioned so sound emits from all directions.
postage printer
Special type of label printer that prints postage stamps.
PCL (printer control language)
Standard printer language that supports the fonts and layout used in standard office documents.
PostScript
Standard printer language used by professionals in the desktop publishing and graphics arts fields, designed for complex documents with intense graphics and colors.
PictBridge
Standard technology used with photo printers that allows you to print photos directly from a digital camera by connecting a cable from the digital camera to a USB port on the printer.
candela
Standard unit of luminous intensity.
organic LED (OLED)
TFT technology that uses organic molecules that produce an even brighter, easier-to-read display than standard TFT displays.
VoIP
Technology that allows users to speak to other users over the Internet using their desktop computer, mobile computer, or mobile device.
force feedback
Technology that sends resistance to a joystick or wheel in response to actions of the user.
digital television (DTV)
Television that receives digital television signals and produces a higher-quality picture.
soft copy
Temporary output presented on a display device.
dot pitch
The distance in millimeters between pixels on a display device. Also called pixel pitch. text created with a smaller dot pitch is easier to read. Average dot pitch on LCD monitors should be .30 mm or lower. The lower the number, the sharper the image.
HDTV (high-definition television)
The most advanced form of digital television, working with digital broadcast signals, transmitting digital sound, supporting wide screens, and providing resolutions up to 1920 x 1080 pixels.
bit depth
The number of bits a video card uses to store information about each pixel. Also called color depth.
Resolution
The number of horizontal and vertical pixels in a display device.
pixel
The smallest element in an electronic image. Short for picture element.
native resolution
The specific resolution for which an LCD is geared.
response time
The time in milliseconds (ms) that is takes to turn a pixel on or off.
thermal wax-transfer printer
Thermal printer that generates images by using heat to melt colored wax onto heat-sensitive paper.
interactive whiteboard
Touch-sensitive device, resembling a dry-erase board, that displays the image on a connected computer screen.
CRT monitor
Type of desktop monitor that contains a cathode-ray tube.
CRT monitors
Type of desktop monitor that contains a cathode-ray tube.
Liquid crystal display (LCD)
Type of display that uses a liquid compound to present information on a display device.
line printer
Type of high-speed impact printer that prints an entire line at a time. The speed is measured by the number of lines per minute (lpm) it can print. Use 11 x 17 inch continuous form paper. Use by mainframes, servers, or networked applications by manufacturing, distribution, or shipping.
laser printer
Type of high-speed, high-quality nonimpact printer that creates images using a laser beam and powdered ink called toner. Laser printer print text and in high-quality resolution 1200dpi for black and white with speed 15 to 62 ppm; up to 2400 dip for color printers with speed 8 to 40ppm.
dot-matrix printer
Type of impact printer that produces printed images when tiny wire pins on a print head mechanism strike an inked ribbon. The speed is measured by the number of characters per second (cps) it can print. speed ranges from 375 to 1100 characters per second.
photo printer
Type of nonimpact color printer that produces photo-lab-quality pictures.
ink-jet printer
Type of nonimpact printer that forms characters and graphics by spraying tiny drops of liquid ink on a piece of paper.
thermal printers
Type of nonimpact printer that generates images by pushing electrically heated pins against heat-sensitive paper.
continuous-form paper
Type of paper, used by most dot-matrix printers, which consists of thousands of pages connected together end to end.
toner
Type of powdered ink that is used by some laser printers and copy machines to produce output.
impact printer
Type of printer that forms characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper.
nonimpact printer
Type of printer that forms characters and graphics on a piece of paper without actually striking the paper.
Braille print
Type of printer that prints information on paper in Braille for use by visually impaired users.
bluetooth printing
Type of printing process that uses radio waves to transmit output to a printer.
nits
Unit of visible light intensity that is equal to one candela (formerly called candlepower) per square meter.
S-video port
Video card port that allows users to connect external analog devices such as a television, DVD player, or video recorder to the computer.
2 Advantage of Digital Television over analog signals
[1] digital signals produce a higher-quality picture. [2] many programs can be broadcast on a single digital channel.
3 basic technologies exist of displaying computer image on an interactive white board
[1] front projection: separate projector displays an image from the computer screen on the interactive white board. [2] rear projection: a projector built into the back of the interactive whiteboard. [3] interactive whiteboard fits over an LCD screen or a plasma display.
fax machine
a device that codes and encodes documents so that they can be transmitted over telephone lines. Used by SOHO users.
rear projection
a projector built into the back of the interactive whiteboard.
dye-sublimation printer
also called a digital photo printer, thermal printer that uses heat to transfer color dye to specially coated paper, creating images of photographic quality. used by photography studios, medial labs, and security id systems.
multifunction peripheral (MFP)
also called all-in-one device, output device that looks like a printer or copy machine but provides the functionality of a printer, scanner, copy machine, and perhaps a fax machine.
measure a monitor
diagonally from one corner to the other.
HDTC broadcast signals are
digitized when they are sent via over the air (OTA) broadcasts from local television networks, satellite, or cable.
audio
download song, narrations, audio clips to enhance understanding.
Output
is data that has been processed into a useful form.
flat screen
means the screen is not cured.
pages per minute (ppm)
measurement of the speed of an ink-jet printer by number of pages per minute it can print. most ink-jet printers print from 12 to 36 ppm.
text
memos, letters, press releases, reports, classified ads.
brightness of an LCD monitor is measured in
nits.
widescreen
refer to LCD monitors that are wider than they are tall.
front projection
separate projector displays an image from the computer screen on the interactive white board.
4 basic types of output
text, graphics, audio, and video.
audio resolution
the number of bytes that represent sound in a give time. High resolution result in better sound quality.
ink-filled cartridge
the print head mechanism in an ink-jet printer.
LCD LED screens
use LEDs to light the screen; offer better picture quality than traditional LCD screens; also thinner and consume 40% less power than LCD screens.
graphics
used to enhance visual appeal and convey information; logs, charts, clip art.
video
video clips to enhance understanding.
