Chapter 4: Output Devices Part 1

CHAPTER 4: OUTPUT DEVICES

Part 1

What is Output?

Any hardware device used to show results after processing to any user and it use to send the results of processing to the user. Output can be audio, video and graphics.

Examples

1) Display Devices
     a) Monitor
          i) Monochrome
         ii) Color
                   (1) CRT
                   (2) LCD/LED
                   (3) Gas Plasma
                   (4) Touch Screen
     b) LCD
     c) LED

2) Printer
     a) Impact
          i) Dot Matrix
         ii) Line
        iii) Daisy Wheel
     b) Non Impact
          i) Ink Jet
         ii) Laser
        iii) Thermal
        iv) Photo
         v) Mobile Printer
3) Projectors
4) Speakers
5) Headphone

Examples

Output Devices

Display Devices

Monitor or display devices are used to get output on screen. It is like small television and available in different sizes and specifications. The text which is displayed on screen is called soft-copy. Like you are reading the current file is made by jabir ali is a soft copy.

Types of Monitor

There are majorly two type of monitor according to its specification. These are

1. Monochrome monitor
2. Color monitor

1. Monochrome Monitor

Monochrome monitor is based on a two colors one for foreground and second for background that can be green, white, black or gray etc… These types of monitors is same like the old mobile phones which have a single color in back ground with black text in display. See picture below.

Monochrome Display

2. Color Monitor

Color monitor is such monitor which is based on more than two colors. The basic colors in the monitors are three which are RGB stands for Red, Green and Blue. These basic colors a monitor can generate many other colors by the combination of these basic colors. By combinations it can make 256 colors. See picture below.

Color Monitor

a) CRT Monitors

The cathode ray tube (CRT) type monitors and makes use of the same technology as a television screen. A beam of electronics is fired from an electronic gun at the back of the tube. This strikes the front of the tube which is covered in phosphorus coated material which glows when struck by electrons. Between the electron gun and the screen the beam is modulated by a signal to produce the image you see on the screen. This tube required 25000 Volts to operate.

b) LCD/LED Monitors

The LCD (Liquid Crystal Display) monitors bring lots of advantages when compared to the CRT ones. The first advantage which is also the most obvious one is the fact that the LCD monitors are smaller and have a smaller weight than the CRT monitors. 

The LCD monitors can be placed on the table and they use far less space than the CRT monitors. This is a great advantage. The picture quality of the LCD monitors will be increased as well which means that the movies will be displayed in a better quality and the games will have better colors.

In most of the cases the LCD monitors will have certain features which provide additional functionality. Some of the LCD monitors have USB (Universal Serial Bus) hubs, HDMI (High-Definition Multimedia Interface) input, TV tuner, and so on. The TV tuner is very important because you can use the computer for watching TV.

LED (Light Emitting Diodes) is like the LCD monitor but it uses LEDs instead of Liquid. These monitors are better than the LCD monitors.

LCD

c) Gas Plasma Monitors

A Plasma display is a computer video display in which each pixel on the screen is illuminated by a tiny bit of charged gas, like a tiny neon light. Plasma displays are better than LCD monitors.

Gas Plasma

d) Touch Screen

These monitors use touching of the screen as an input method. Items can be selected or moved with a finger, and finger gestures may be used to transmit commands.

Touch Screen