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Output Thomas W. Davis What is Output? Output it data that has been processed into a useful form Output includes: Monitors Printers Speakers Etc. Basic Categories Text Graphics Audio Video Display Devices

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Thomas W. Davis

what is output
What is Output?
  • Output it data that has been processed into a useful form
  • Output includes:
    • Monitors
    • Printers
    • Speakers
    • Etc.
basic categories
Basic Categories
  • Text
  • Graphics
  • Audio
  • Video
display devices
Display Devices
  • Display device: output device that visually conveys text, graphics, and video information
    • Information is referred to as a soft copy
  • Consist of a screen and the components that produce the information on the screen
  • Plastic or metal case that houses a display device as a separate peripheral
  • Most mobile computers and devices integrate the display and other components into the same physical case
  • Display may be color or monochrome
crt monitors
CRT Monitors
  • A desktop monitor that is similar to a standard television because it contains a cathode-tube
  • A cathode-ray tube (CRT) is a large, sealed glass tube
how the display works
How the Display Works
  • The screen is made of dots of phosphor material
    • Each dot is made of red, green, and blue
    • Three dots combine to form a pixel
  • An electron beam moves back and forth across the back of the screen causing the dots to glow, producing an image
monitor sizes
Monitor Sizes
  • You measure monitor size diagonally from top left corner to bottom right corner
    • This is divided into viewable size and actual size
  • Determining the size of the monitor to purchase depends on the intended use
crt monitor ergonomics
CRT Monitor Ergonomics
  • Features that include: tilt-and-swivel base, brightness, contrast, positioning, height, and width controls
  • ENERGY STAR program
    • Encourages manufacturers to create energy efficient devices that use little energy when not in use
quality of a crt monitor
Quality of a CRT Monitor
  • Depends on the resolution
    • Describes the sharpness and clearness of an image
    • Most monitors support a wide range or resolutions up to 1600 x 1200, with 800 x 600 the normal
  • Also depends on dot pitch and refresh rate
video cards and crt monitors
Video Cards and CRT Monitors
  • Video card: converts digital output from the computer into an analog video signal and sends the signal through the cable to the monitor, which displays output on the screen
color depth
Color Depth
  • The number of bits a video card uses to store information about each pixel
    • The greater the number of bits the better the image
flat panel displays
Flat-Panel Displays
  • Flat panel display is a display with a shallow depth that does not use CRT technology
  • Includes monitors, LCD displays, gas plasma displays and HDTV
flat panel monitors
Flat-Panel Monitors
  • Also called an LCD monitor, is a desktop monitor that uses a liquid crystal display rather than a cathode-tube to produce images
advantages to a flat screen
Advantages to a Flat-Screen
  • Take up less desk space, called footprint
  • Uses one-third the power of a CRT monitor
  • Produces less heat
  • Does not produce radiation
lcd technology
LCD Technology
  • Liquid crystal display (LCD) uses a liquid compound to present information on a screen
  • Produce color using either passive-matrix or active-matrix technology
  • LCD quality is measured in the same manner as CRT display quality is measured
gas plasma displays
Gas Plasma Displays
  • A display that uses gas plasma technology, which substitutes a layer of gas for the liquid crystal material in a flat panel monitor
  • When voltage is applied, the gas releases UV light causing pixels on the screen to glow
televisions and hdtv displays
Televisions and HDTV Displays
  • Digital televisions have two major advantages
    • Digital signals produce a higher-quality picture
    • Many programs can be broadcast on a single digital channel
  • HDTV: is the most advanced from of digital television
  • A printer is an output device that produces text and graphics on a physical medium
  • Produce hard copies of data
impact printers
Impact Printers
  • Impact Printer: form characters and graphics by striking a mechanism against an inked ribbon that physically contacts the paper
  • Types:
    • DOT-MARTIX Printer
    • Line Printers
nonimpact printers
Nonimpact Printers
  • Nonimpact printers: forms characters and graphics on a piece of paper without actually touching the paper
  • Types:
    • Ink-Jet
    • Photo Printers
    • Laser Printers
    • Thermal Printers
    • Portable Printers
speakers and headsets
Speakers and Headsets
  • Audio output device: a component of a computer that produces music, speech or other sounds
faxes machines and fax modems
Faxes Machines and Fax Modems
  • Fax machine: short for facsimile machine, is a device that transmits and receives documents over telephone lines.
  • Fax modem: allows the user to send and receive electronic documents and faxes.
multifunction perpheral
Multifunction Perpheral
  • A single device that looks like a copy machine but provides the functionality of a printer, scanner, copy machine, and a fax machine
data projectors
Data Projectors
  • A device that takes the image from computer screen and projects it onto a larger screen
  • LCD Projector
  • Digital Light Processing Projector