Fundamentals of computer output devices

REVIEWREVIEW

1. An input device with a set of 1. An input device with a set of typewriter like keys that typewriter like keys that enables you to enter data.enables you to enter data.

2. The standard lay-out of the 2. The standard lay-out of the keyboard.keyboard.

3. An input devices that 3. An input devices that controls the movement of the controls the movement of the cursor.cursor.

The Boy and the Apple Tree

FUNDAMENTAL FUNDAMENTAL PARTS OF A PARTS OF A COMPUTERCOMPUTER

Output DevicesOutput Devices

OUTPUT DEVICESOUTPUT DEVICES•Is any peripheral device Is any peripheral device that presents, displays, that presents, displays, alters, or records output alters, or records output after it has left a after it has left a computer’s system.computer’s system.

COMPUTER SPEAKERCOMPUTER SPEAKER

•CONVERT CONVERT OUTPUT DATA OUTPUT DATA INTO SOUND.INTO SOUND.

MONITORMONITOR

•IS THE MOST POPULAR IS THE MOST POPULAR OUTPUT DEVICE, IT RECIEVES OUTPUT DEVICE, IT RECIEVES SIGNALS FROM A VIDEO CARD SIGNALS FROM A VIDEO CARD INSIDE OF THE SYSTEM UNIT INSIDE OF THE SYSTEM UNIT AND GIVES THE USER A AND GIVES THE USER A GRAPHICAL OR TEXTUAL GRAPHICAL OR TEXTUAL DISPLAY.DISPLAY.

•The monitor looks like a The monitor looks like a television screen.television screen.

•It is also called Visual It is also called Visual Display Unit (VDU)Display Unit (VDU)

•It is used to display It is used to display information from the information from the computer.computer.

•There are coloured as well There are coloured as well as black and white monitors.as black and white monitors.

•The monitor displays text and The monitor displays text and graphics.graphics.

•Based on the technology Based on the technology used, monitor is classified used, monitor is classified into two types. They are,into two types. They are,

–        –        Cathode Ray Tube (CRT) Cathode Ray Tube (CRT) monitorsmonitors

–        –        Liquid Crystal Display Liquid Crystal Display (LCD) monitors(LCD) monitors

Cathode Ray Tube (CRT) monitors

Liquid Crystal Display (LCD) monitors

PRINTERPRINTER

•CREATE IMAGES ON PAPER, CREATE IMAGES ON PAPER, PLASTIC, CLOTH AND OTHER PLASTIC, CLOTH AND OTHER PRINT MEDIA USING PRINT MEDIA USING TEACHNOLOGIES LIKE INK TEACHNOLOGIES LIKE INK TRANSFER, HEAT TRANSFER, TRANSFER, HEAT TRANSFER, CHEMICAL REACTIONS, AND CHEMICAL REACTIONS, AND PHYSICAL FORCE.PHYSICAL FORCE.

Types of PrintersTypes of Printers

•Laser Printers-Laser Printers- uses toner and uses toner and internal laser to print. The most internal laser to print. The most popular is HP (Hewlett Packard. popular is HP (Hewlett Packard. Most laser printers offer Most laser printers offer excellent printing capability. excellent printing capability. The average laser printers The average laser printers prints in black. Color laser prints in black. Color laser printers are about three to four printers are about three to four times the cost of one color laser times the cost of one color laser printers.printers.

INKJET OR BUBBLE JETINKJET OR BUBBLE JET

•USES INK TO PRINT. USUALLY ARE USES INK TO PRINT. USUALLY ARE AVAILABLE IN COLOR. THE AVAILABLE IN COLOR. THE QUALITY OF THE PRINT IS QUALITY OF THE PRINT IS DETERMINED BY THE DETERMINED BY THE DPI (Dots Per DPI (Dots Per Inch).Inch). The higher the DPI The higher the DPI resolution the better quality of the resolution the better quality of the print. This is based on the number print. This is based on the number of dots that the printer can draw of dots that the printer can draw within one square inch.within one square inch.

DOT-MATRIX PRINTERDOT-MATRIX PRINTER

•CREATES CHARACTERS BY CREATES CHARACTERS BY STRIKING PINS AGAINTS STRIKING PINS AGAINTS AN INK RIBBON. EACH PIN AN INK RIBBON. EACH PIN MAKES A DOT, AND MAKES A DOT, AND COMBINATIONS OF DOTS COMBINATIONS OF DOTS FORM CHARACTERS AND FORM CHARACTERS AND ILLUSTRATIONS.ILLUSTRATIONS.

PRINTERS ARE ALSO PRINTERS ARE ALSO CLASSIFIED BY THE FF. CLASSIFIED BY THE FF. CHARACTERISTIC:CHARACTERISTIC:•QUALITY OF TYPE: the output QUALITY OF TYPE: the output

should be either letter quality, near should be either letter quality, near letter quality, or draft quality.letter quality, or draft quality.

•SPEED: measured by characters SPEED: measured by characters per second (cps) or pages per per second (cps) or pages per minute (ppm), the speed of minute (ppm), the speed of printers varies widely.printers varies widely.

Dot Matrix Printer

Inkjet Printer Laser Printer

Prints characters in the form of dots

Prints fully formed characters

Prints fully formed characters

Speed: 200-540 characters per second

Speed: 4-8 pages per minute

Speed: 4-20 pages per minute

Not very expensive

Moderately priced Expensive

• IMPACTIMPACT: impact printers include : impact printers include all printers that work by striking all printers that work by striking an ink ribbon, like daisy wheel, an ink ribbon, like daisy wheel, dot-matrix, and line printers.dot-matrix, and line printers.

•NON IMPACT-NON IMPACT- non impact non impact printers include laser printers printers include laser printers and ink jet printers.and ink jet printers.

•The differences between impact The differences between impact and non-impact printers is that and non-impact printers is that impact printers are impact printers are much noisier.much noisier.

•Touch ScreenTouch Screen

•A touch screen is a computer A touch screen is a computer display screen that is display screen that is sensitive to human touch.sensitive to human touch.

•It allows the user to interact It allows the user to interact with the computer by with the computer by touching pictures or words touching pictures or words displayed on the screen.displayed on the screen.

•Touch screens are used to Touch screens are used to display the output information display the output information on the screen as well as to give on the screen as well as to give input by touching the words or input by touching the words or pictures on the screen. Thus it pictures on the screen. Thus it is an input/output device.is an input/output device.

•Touch screens are normally Touch screens are normally used when information has to used when information has to be accessed with minimum be accessed with minimum effort.effort.

END OF THE LESSONEND OF THE LESSON

Thanks for ListeningThanks for Listening

TEST YOUR SELFTEST YOUR SELF

• An output device that convert data An output device that convert data into sound. into sound.

• Gives the user the graphical or Gives the user the graphical or textual display.textual display.

• Create images on paper or other Create images on paper or other print media.print media.

• A printer that uses ink to print.A printer that uses ink to print.

• Printing speed is measured in cps or Printing speed is measured in cps or ppm. What is cps and ppm?ppm. What is cps and ppm?

Assignment/AgreementAssignment/Agreement

•What is the difference between What is the difference between input devices and output devices. input devices and output devices. Explain your answer by uploading Explain your answer by uploading photos of both devices. photos of both devices.

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