BCA 1st Year Output Devices of Computer Notes Study Material

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BCA 1st Year Output Devices of Computer Notes Study Material

Output Devices 

An output device is an electromechanical device, which accepts data from a computer and translates them into a form, which is suitable for use by the outside world (the users). The following functions are performed by the output devices:

1. The output device accepts the result produced by the computer in binary form.

2. Then, the output device converts these coded results to a human-acceptable (readable) form (such as, in English, Hindi or other similar languages).

3. Finally, the output device supplies the converted results to the outside world (i.e., the user).

There are two broad categories of computer-produced output:

1. Softcopy Output: It is usually a screen-displayed output. It is a transient form of output and is lost when the computer is turned off. The Softcopy output device is a monitor. 

2. Hardcopy Output: It refers to information that is produced on paper and can be read immediately or stored and read later. This is a relatively stable and permanent form of output. Hardcopy output devices are printers and plotters.

Monitor

Monitors are the most popular output devices used today for producing soft-copy output. A monitor displays information in visual form, using text and graphics. The portion of the monitor that displays the information is called the screen. Like a television screen, a computer screen can show still or moving pictures.

There are two basic types of monitors:

1. CRT (Cathode Ray Tube) monitor and

2. LCD (Liquid Crystal Display) monitor.

Both types produce sharp images but LCD monitors have the advantage of being much thinner and lighter. CRT monitors however are generally more affordable. They are shown in Fig. (a) and (b).

The CRT monitors look much like television and are used with non-portable computer systems. CRT monitors are available in monochrome (i.e., black and white and colour. Monochrome monitors have only one CRT for white colour to produce black and white output. Colour monitors have three CRTs for red, green and blue colours to produce colour output.

The flat-panel monitors (like LCDs and TFTs) are thinner, lighter and consume less energy. LCD stands for Liquid Crystal Display. TFT stands for Thin Film Transistor. LCDs are commonly used with portable computer systems (like laptop computers), watches and calculators.

Computer Speakers

Speakers are used to playing sound. They may be built into the system unit or connected with cables. Speakers allow you to listen to music and hear sound effects from your computer.

BCA 1st Year Output Devices of Computer Notes Study Material

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