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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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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

  • 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


Monitor

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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 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

  • 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 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

  • 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

  • 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

  • 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

  • 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

  • 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


Printers

  • A printer is an output device that produces text and graphics on a physical medium

  • Produce hard copies of data


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: 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

  • Audio output device: a component of a computer that produces music, speech or other sounds


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

  • 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

  • A device that takes the image from computer screen and projects it onto a larger screen

  • LCD Projector

  • Digital Light Processing Projector


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