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Output Devices

Lecture # 3

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Output

Output is data that has been processed into a useful form

Hardcopy : Hardcopy refers to printed output Softcopy : Softcopy refers to data that is shown on a

display screen or is in audio or voice form.

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Output Devices

An output device is any type of hardware component that conveys information to one or more people

Display Devices Printers Speakers Data projectors

Chapter # 3 , page # 93

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Monitors

Most commonly used output device Categories of Monitors

Monochrome monitors Grayscale monitors Color monitors See page # 94

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Types of Monitors

CRT monitor (Page # 95) A CRT, for cathode-ray tube, is a vacuum

tube used as a display screen in a computer or video display terminal. Images are represented on the screen by individual dots or “picture elements” called pixels. A pixel is the smallest unit on the screen can be turned on and off or made different shades.

See Page # 95Designed by Prof. Anosha Khan

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Flat-panel Displays(Page # 96)

Flat-panel display - made up of two plates of glass separated by a layer of a substance in which light is manipulated

Categories of LCDActive-matrix - each pixel on the screen is controlled by its own transistorTFT- Thin film transistorPassive-matrix - a transistor controls a whole row or column of pixels

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Other Types of monitors

Paper-white displays Creates higher contrast , Used by desktop

publishing specialists, newspaper or magazine compositor and other persons who creates high quality printed documents

Electroluminescent Displays(ELDs) Uses phosphorescent film held between two

sheets of glass. A grid of wires sends current through the film to create an image

Plasma DisplayThese are display devices that use gas plasma technology

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Qualities of Monitors

Size The Larger the size the bigger the image Measured diagonally

Resolution Sharpness and clarity of image Number of pixels on the screen 640X480 means 640 pixels horizontally

and 480 pixels vertically Video graphics array

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Refresh Rate Number of times per second that the

electron gun scans pixels on screen Measured in Hertz

Dot Pitch The distance between the liked colored

phosphor dots of adjacent pixels Measured as a fraction of a

millimeter(mm)

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Printers

A printer produces text and graphics on a physical medium Printed information is called a hard copy,

or printout Landscape or portrait orientation

Impact printers Non impact printers

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Impact Printers

Impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper Dot matrix printer▪ Line Printer▪ Band Printers

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Non Impact Printers

A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper Laser Printer Ink-Jet Printer Thermal Printer

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Laser Printer

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Ink Jet printer

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Plotter

It is used to print large format images

Used for architectural, engineering drawings and construction maps

Drum Plotter Flatbed Plotter

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Speakers, Headphones, and Earbuds An audio output device produces music,

speech, or other sounds Most computer users attach speakers to

their computers to: Generate higher-quality sounds for playing games Interact with multimedia presentations Listen to music View movies

Headphones are speakers that cover your head or are placed outside of the ear

Earbuds (also called earphones) rest inside the ear canal

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Data Projector

A data projector is a device that takes the text and images displaying on a computer screen and projects them on a larger screen Digital light

processing (DLP) projector

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Interactive

An interactive whiteboard is a touch-sensitive device, resembling a dry-erase board, that displays the image on a connected computer screen

Home Task all-in-one peripherals, photo printer, Dye-sublimation Printers