Chapter 7

Chapter 7
Understanding Output

Output is data that has been processed into a useful form.

Types of outputs:

1. Display devices : visually conveys text, graphics, and video information

• A monitor is packaged as a separate peripheral

        -LCD monitor

        -Widescreen

• Liquid crystal display (LCD) uses a liquid compound to present information on a display device
• Resolution is the number of horizontal and vertical pixels in a display device

         -A higher resolution uses a greater number of pixel and that why we hav 2k and 4k resolution

• Graphic processing unit (GPU) controls the manipulation and display of graphics on a display device.
• Plasma monitor- display devices that use gas plasma technology.
• Television- such as digital television (DTV) and HDTV.
• CRT monitor- uses cathode-ray tube to display.

      2. Printer- device that accept text and graphics output from a computer and transfers the information to paper.

• Types of printer:
• 1) Non-impact printer- forms characters and graphics on a piece of paper without striking and leaving mark on paper.
• For example:
• i) Ink-jet printer- forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper.
• ii) Photo printer- produces colour photo-lab-quality pictures.
• iii) Laser printer- high speed printer that uses laser technology. A rotating mirror will deflect a laser beam across surface of a drum that creates charges which will attract toner to stick to the drum. The toner will transfer to the paper when drum rotate and press against paper. And a set of roller uses heat and pressure to fuse the toner permanently to the paper.
• iv) Multifunctional peripheral- a single device that scan, print, copies and fax.
• v) Thermal printer- generate images by pushing electrically heated pins against the heat sensitive paper. For example, thermal wax-transfer printer and dye-sublimation printer.
• vi) Mobile printer- small, lightweight and battery-powered printer for portability.
• vii) Label printer- small printer that prints on adhesive-type material.
• viii) Plotter- used to produce high quality drawings.
• ix) Large-format printer- create photo-realistic quality colour prints on a larger scale.
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• 2) Impact printer- form characters and graphics on a piece of paper by striking and leaving mark on paper.
• For example:
• i) Dot-matrix printer- produces printed images when tiny wire pins on a print head mechanism strike an inked ribbon.
• ii) Line printer- prints an entire line at a time.
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       3. Speakers, Headphones and Earbuds- an audio output device that produces sound.

• For example:
• 1) Speaker- convert analog audio signals into equivalent air vibration in order to make audible sound.
• 2) Headphones- speaker that cover the ear.
• 3) Earbuds- rest inside ear canal.
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        4.  Data projector- is a device that takes text and images displaying on computer screen and projects them on a larger screen.

• For example:
• 1) LCD projector.
• 2) Digital light processing (DLP) projector.
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         5. Interactive white board- a touch sensitive device, resembling a dry-erase board that displays the image on a connected computer screen.