Chapter 7 Understanding Output

Output is a data that has been processed into a useful form. An output device is any type of hardware component that conveys information to one or more people. For example monitor , printers , speakers ,headphone ,earbuds ,data projectors , and etc.

Display Devices

• A display device is conveys text , graphics and video information
• for monitor is a packaged as separate peripheral
• Liquid crystal display (LCD) is a liquid compound to present information on a display device 
• the quality of an LCD depends primarily on resolution , response time ,brightness ,dot pitch and contrast ratio

Printers

• A printer is produces text and graphics on a physical medium 
• it printed information that we called a hard copy or printout
• A nonimpact printer forma characters and graphics on a piece of paper without actually striking the paper for example ink-jet printers , photo printers , laser printers , thermal printers , mobile printers , label and postage printers ,plotters and large-format printers.
• an ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper 
• a photo printer produces color photo-lab-quality pictures
• laser is high-speed , high-quality , black and white and color
• a multifunction peripheral(MFP) is a single device that prints , scans , copies , and in some cases , faxes 
• a thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper 
• a mobile printer is a small, lightweight , battery-powered printer that allows a  mobile user to print from a notebook computer , smart phone , or other mobile device
•  a label printer is a small printer that prints on adhesive-type material
• plotters are used to produce high-quality drawings
• large-format printers create photo-realistic quality color prints on a larger scale
• impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper 
• a dot-matrix printer produces printed images when tiny wire pins on a print head mechanism strike an inked ribbon 
• a line printer prints an entire line at a time

Speakers, headphones , and earbuds
An audio output device produces music , speech , or other sounds 
most of the computer users attach speakers to their computer to generate higher-quality sound for playing games,  listen to music and watching movie

• headphone are a type of speakers that cover or are placed outside of the ear
• earbuds that also called earphone rest inside the ear canal
• some of the speakers are specifically designed to play audio from a portable media player

voice output occurs when you hear a person's voice or when the computer talks to our through the speakers 

other output device are available for specific uses and applications.For example ,data projectors , interactive whiteboards , force-feedback game controllers and tactile output

• a data projector is a device that takes the text and images displaying on a computer screen and projects them on a larger screen 
• an interactive whiteboard is a touch-sensitive device, resembling a dry-erase board ,that displays the image on connected computer screen 
• force-feedback sends resistance to the device in response to actions of the user 
• tactile output provides the user with a physical response from the device