discovering computers 2010
                 living in digital computer..

objective overview

• describe the types of output
• explain the characteristics of various display devices
• describe the factors that affect the quality of an LCD monitor or LCD screen
• describe variuos ways to print
• differentiate between a nonimpact printer and an impact printer
• summarize the characteristics of ink-jet printers, photo printers, laser printers, multifunction peripherals, thermal printers, mobile printers, label and postage printers, and plotters and large-format printers
• describe the uses and characteristics of speakers, headphones, and earbuds
• identify the purpose and features of data projectors, interactive whiteboards, and force-feedback game controllers and tactile output
• identify output options for physically challenged users

what is Output?
output is 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.
A display device visually conveys texs, graphics, and video information.

1. A monitor is packaged as a separate peripheral

• LCD monitor
• widescree

2. Liquid crystal display (LCD) uses a liquid compound to present information on a display device

•  active-matrix display
• passive-matrix display

3. The quality of an LCD monitor or LCD screen

• resolution
• pesponse time
• brightness
• dot pitch
• contrast ratio

The graphics processing unit (GPU) controls the manipulation and display of graphics on a display device.
LCD monitors use a digital signal and should plug into a DVI port, and HDMI port, or a Display port.
Plasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches.
Televisions also are a good output device

• Require a converter if you are connecting your computer to an analog television

Digital television (DTV) offers a crisper, higher-quality output
HDTV is the most advanced form of digital television
A CRT monitor is a desktop monitor that contains a cathode-ray tube

• Have a much larger footprint than do LCD monitors

A printer produces text and graphics on a physical medium

• Printed information is called a hard copy, or printout
• Landscape or portrait orientation
• A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper
• An ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper

  
  

  •  A photo printer produces colour photo-lab-quality pictures

  1. Most use ink-jet technology
  2. PictBridge allows you to print photos directly from a digital camera
  3. Print from a memory card and preview photos on a built-in LCD screen

     •  A laser printer

     1. black-white
     2. colour
     3. hight-quality
     4. higth-speed

     
     

– Color or black-and-white

– Printers with a higher dpi (dots per inch) produce a higher quality output