Output devices 6 things

presentation by output device

1. OUTPUT DEVICES PRESENTATION BY M.ZAIN KHALID

2. CONTENTS INTRODUTION MONITOR SPEAKER PRINTER PLOTTER HEADPHONE PROJECTOR

3. INTRODUCTION Output device receive information from the CPU and Present it to the user in user understandable form. Output device can normally be produce in two ways: Either on display unit or In a paper Form of output on Computer Screen which is in Electronic form is softcopy output . Output on paper which is in non-electronic form is called hardcopy.

4. What is a Monitor ? VDT and terminals monitors introduced in 1980’s. The monitors are display devices are most-used output device on computer. Monitors are very similar to televisions but usually display information at a much higher resolution. Monitors are very important because without them you wouldn't be able to do anything.

5. History On Monitor VDT and terminals monitors introduced in 1980’s. They only displayed text in 2 colours usually black and green . In 1981 IBM introduced the CRT monitors which could display 16colours . 1990’s LCD monitors were introduced.

6. MONITOR QUALITY AND RESOLUTION Quality: Manufacturers describe quality by dot pitch. The quality of the image on the screen depends upon many factors. Resolution : Resolution is one of the factor affecting the quality of the monitor. The resolution of a monitor refers to the number of pixels on the screen expressed as a matrix. Most modern monitors can display 1024x768 pixels.

7. Speakers Speaker is a output device. A output device connected to a computer's sound card that outputs sounds generated by the computer. Speakers can be used for various sounds meant to alert the user, as well as music and spoken text.

8. Advantages & Disadvantages Advantages: They ‘re very simple to operate . Disadvantages : They can take up a fair amount desk-space compared to headphones.

9. Printer A printer is a device that produces hardcopy on the paper. Printers are commonly used in businesses to get the documents printed on paper. Types of Printer: Printers can be categorized into : Impact Printer Non-Impact Printer

10. Types of Printer: Impact Printer: An impact printer produces images by striking an inked ribbon with hammer or a set of pins, pressing ink from the ribbon onto piece of paper. Impact printer are oldest technologies.

11. Advantage & Disadvantages A dvantages : Less expensive Can make multiple copies with multipart paper Disadvantages: The impact printer is very Slow. Print quality lower in some types

12. Types of impact printer Dot- matrix printer : Dot matrix printer produces characters by striking pins against an ink ribbon To printer closely spaced in the appropriate shape . The shape forms a number , alphabet or other special characters. Dot matrix printer are relative expensive. They do not produce high-quality output.

13. Dot-Matrix printer

14. Type of impact printer Daisy wheel printer : These printer etched at the outer edge of a pedaled wheel which form characters in the same way as a typewriter. Daisy wheel printer are loud and slow. They cannot printer graphics , and cannot changes fonts.

15. Daisy- wheel printer

16. Type impact printer Line printer: These printer is somewhat similar to the daisy wheel - printer is the line printer. Line printer have a mechanism that allows multiple character to the simultaneously printed on the same line. The printer speed ranging from 300 LPM ( lines per minute )to 2400 LPM.

17. Type of printer Non- impact printer: A non impact printer produces images on paper without striking the page on the way. These printer are inexpensive to manufacture and silent . Very fast non-impact printer Printing more then 24 pages per minute.

18. Type non-impact printer LASER Printer : Laser stand for light amplification by stimulated emission of radiation. Laser printer are similar to copy machine. They use laser beams to burn special ink is called toner on page to create a permanent images. The printer is vary fast and high quality provides. Laser printer have speeds of 4,8,12 or more page per minute.

19. Laser printer

20. Non-Impact Printer Ink jet printer: Ink jet printer is a type of printer that works by spraying ink on sheet a paper. The printer are capable of producing high quality of printer. In general, the price of ink jet printer is lower then of laser printer.

21. plotter Plotter: A plotter us a large scale printer that receives commands from a computer to make drawing on paper with one or more automatic pens. Plotters are used in applications such as computer-aided design such as diagrams, layouts, specification sheets and banners. The plotter is capable of producing color drawings in a matter of minutes. Plotters are considerably more expensive than printers.

22. Plotter

23. Headphones Headphone: Headphones give sound output from the computer. They are similar to speakers, except they are worn on the ears so only one person can hear the output at a time .

24. Projector Projector: An output device that can take the display of a computer screen and project a large version of it onto a flat surface. Projectors are often used in meetings and presentations so that everyone in the room can view the presentation.

25. Projector Types of projector: Cathode Ray Tube (CRT) projector. Liquid Crystal Display (LCD) projector. Digital Light Processing (DLP) projector.

26. Type of Projector Cathode Ray Tube (CRT) projector: In the early days of projectors, CRT projectors were commonly used . They utilized three tubes, one for each of the primary colors. Due to their large size, low light output they are no longer commonly used . CRT projectors are both larger LCD and DLP projectors.

27. Type of Projector Liquid Crystal Display (LCD) projector: LCD projectors work by utilizing polarized mirrors that pass and reflect only certain colors of light. An LCD projector can achieve greater brightness at a lower energy consumption Smaller than CRT projectors

28. Type of projector Digital Light Processing (DLP) projector: DLP projectors can be classified as one-chip or three-chip. One-chip DLP projectors can produce more than 16 million colors while three-chip models can produce more than 35 trillion colors. This allows DLP projectors to reproduce more natural and lifelike images.