An output device is any hardware component that conveys information to one or more people.Three commonly used output devices are a printer, a monitor and speakers. Actually we already familiar with the devices. Only the term "output devices" that we rarely heard.
speaker
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| monitor |
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| printer |
Speakers are one of the most common output devices used with computer systems. Some speakers are designed to work specifically with computers, while others can be hooked up to any type of sound system. Regardless of their design, the purpose of speakers is to produce audio output that can be heard by the listener.
Speakers are transducers that convert electromagnetic waves into sound waves. The speakers receive audio input from a device such as a computer or an audio receiver. This input may be either in analog or digital form. Analog speakers simply amplify the analog electromagnetic waves into sound waves. Since sound waves are produced in analog form, digital speakers must first convert the digital input to an analog signal, then generate the sound waves.
The Monitor
It is the most commonly used output device. The monitor is a soft copy (means we can modify contents of data and data is temporarily on the screen) output device. A monitor looks like a television and it displays alphanumeric and graphic output. A monitor is also called Visual display unit (VDU) or Cathode Ray Tube (CRT). The special program called Screen Dump Saves contents of the monitor screen.
Types of Monitor:
According to resolution, a monitor is of two types:
· High Resolution (Good quality of text and graphics on the screen)
· Low Resolution (Low quality of text and graphics)
Sizes of Monitor
According to screen size, a monitor is available in different sizes:
· 3 to 30 inch screens are available in the market.
· 15 and 17-inch screen are common now a day.
According to volume, a monitor is of two types:
· CRT (Cathode ray tube):
Monitors of this type screen are used commonly in homes, colleges and offices. These monitors are big and require big area to place, power and have weight more than 10 pounds. We cannot move these monitors easily.
· Flat - panel tube:
These monitors are also available nowadays in markets. These monitors are normally used in Laptop computers and we can also use these monitors in desktop computers. There are several types of flat-panel monitors, but the most common is the liquid crystal display (LCD) monitor.
According to display, a monitor is of two types:
· Monochrome
These monitors display images only in single colour. This colour can be white, green, blue, red or amber. This monitor can display shades of one colour and the computer industry uses the term gray scales to refer to the number of shades of a colour that can be shown on a monochrome monitor’s screen.
· Colour
This monitor shows graphics with full colours. These monitors produce images in three mixed colours, which are red, green and blue that is why these are also called RGB monitors. A typical monitor can display 256 to 65536 colours.
Touch Screen Monitor:
Touch Screen monitors allow the user to point directly at the computer display, usually to select from a menu of choices on the screen. Most touch-screen computers use sensors in, or near, the computer’s screen that can detect the touch of a finger. Touch screens are appropriate in environments where dirt or weather would render keyboards and pointing devices useless and where a simple interface is important.
These monitors display images only in single colour. This colour can be white, green, blue, red or amber. This monitor can display shades of one colour and the computer industry uses the term gray scales to refer to the number of shades of a colour that can be shown on a monochrome monitor’s screen.
· Colour
This monitor shows graphics with full colours. These monitors produce images in three mixed colours, which are red, green and blue that is why these are also called RGB monitors. A typical monitor can display 256 to 65536 colours.
Touch Screen Monitor:
Touch Screen monitors allow the user to point directly at the computer display, usually to select from a menu of choices on the screen. Most touch-screen computers use sensors in, or near, the computer’s screen that can detect the touch of a finger. Touch screens are appropriate in environments where dirt or weather would render keyboards and pointing devices useless and where a simple interface is important.
Printers
Printers are the most commonly used output devices that can be found in almost all computer centres. Printers are used to get prints of important documents on a paper. The output, which is generated by a printer, is called hard copy of the data. Printer is also called a hard copy output device.
Categories of printers:
Broadly there are two categories of printers:
· Impact printers
This printer uses the familiar typewriter approach of hitting a character against paper and inked ribbon.
· Non-impact printers
These printers do not hit or impact a ribbon to print. They use thermal electrostatic, chemical, and inkjet technologies. These printers move a print head across the page.
Classification of printers:Printers are classified as:
· Character printers
· Line printers
· Page printers
Printers are the most commonly used output devices that can be found in almost all computer centres. Printers are used to get prints of important documents on a paper. The output, which is generated by a printer, is called hard copy of the data. Printer is also called a hard copy output device.
Categories of printers:
Broadly there are two categories of printers:
· Impact printers
This printer uses the familiar typewriter approach of hitting a character against paper and inked ribbon.
· Non-impact printers
These printers do not hit or impact a ribbon to print. They use thermal electrostatic, chemical, and inkjet technologies. These printers move a print head across the page.
Classification of printers:Printers are classified as:
· Character printers
· Line printers
· Page printers
Till then...
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