Output Device – This book covers the entire syllabus of “Computer & Information Technology” prescribed by the BNMC for B.Sc. in Nursing Science & Diploma in Nursing Science & Midwifery students. We tried to accommodate the latest information and topics.
This book is an examination setup according to the teachers’ lectures and examination questions. We hope in touch with the book students’ knowledge will be upgraded and flourished. The unique way of presentation may make your reading of the book a pleasurable experience.
Output Device
An output device is any device used to send data from a computer to another device or user. Most computer data output that is meant for humans is in the form of audio or video. Thus, most output devices used by humans are in these categories.
Examples include
- Monitors,
- Projectors,
- Speakers,
- Headphones and
- Printers
Types of Output Device:
The following list contains many different output devices. For further information, select any of the listings with blue text.
- 3D Printer
- Braille embosser
- Braille reader
- Flat panel
- GPS
- Headphones
- Computer Output Microfilm (COM)
- Monitor
- Plotter
- Printer (Dot matrix printer, Inkjet printer, and Laser printer)
- Projector
- Sound card
- Speakers
- Speech-generating device (SGD)
- TV
- Video card
Difference between Input and Output Unit:
| Traits | Input Unit | Output Unit |
| 1. Definition | An input device is a hardware or peripheral device used to send data to a computer. | An output device is any device used to send data from a computer to another device or user. |
| 2. Ability to send data to computer | Yes | No |
| 3. Function | An input device is a component used to feed information to a computer, | An output device gives processed information back to the user. |
| 4. Example | Examples of input devices include:
| Examples include
|
SHORT NOTE ON OUTPUT DEVICE
PRINTER
Definition of Printer:
A printer is any device that prints text or illustrations on paper. There are many different types of printers.
Types of Printer:
In terms of the technology utilized, printers fall into the following categories:
1. Dalsy-wheel: Similar to a ball-head typewriter, this type of printer has a plastic or metal wheel on which the shape of each character stands out in relief.
2. Dot-matrix: Creates characters by striking pins against an ink ribbon. Each pin makes a dot, and combinations of dots form characters and illustrations.
3. Ink-jet: Sprays ink at a sheet of paper. Ink-jet printers produce high-quality text and graphics.
4. Laser: Uses the same technology as copy machines. Laser printers produce very high quality text and graphics.
5. LCD & LED: Similar to a laser printer, but uses liquid crystals or light-emitting diodes rather than a laser to produce an image on the drum.
6. Line printer: Contains a chain of characters or pins that print an entire line at one time. Line printers are very fast, but produce low-quality print.
7. Thermal printer: An inexpensive printer that works by pushing heated pins against heat- sensitive paper. Thermal printers are widely used in calculators and fax machines.
Printer Characteristics
Printers are also classified by the following characteristics:
1. Quality of type: The output produced by printers is said to be either letter quality (as good as a typewriter), near letter quality, or draft quality.
2. Speed: Measured in characters per second (cps) or pages per minute (ppm), the speed of printers varies widely.
3. Impact or non-impact: Impact printers include all printers that work by striking an ink ribbon. Daisy-wheel, dot-matrix, and line printers are impact printers.
4. Graphics: Some printers (daisy-wheel and line printers) can print only text. Other printers can print both text and graphics.
5. Fonts: Some printers, notably dot-matrix printers, are limited to one or a few fonts. In contrast, laser and ink-jet printers are capable of printing an almost unlimited variety of fonts.
MONITOR
A computer monitor is an output device which displays the information in pictorial form. A monitor usually comprises the display device, circuitry, casing, and power supply.
Types of Monitor:
They can be broadly categorized into three types.
1. CRT (Cathode Ray Tube)
2. LCD (Liquid Crystal Display)
3. LED (Light-Emitting Diodes)
CRT (Cathode Ray Tube) Monitors
These monitors employ the CRT technology used most commonly in the manufacturing of television screens. In this, a stream of intense high energy electrons is used to form images on a fluorescent screen.
There are several advantages of using CRT monitors:
- These monitors are highly reliable and efficient, and are capable of generating a resolution of up to 2048 x 1536 pixels, thereby providing a clear picture quality. Also, CRT monitors that are now available are capable of producing thousands of different colors.
- Secondly, CRT monitors are affordable and cost effective.
- Unlike conventional CRT monitors, modern technological advancements have resulted in the development of flat screen CRT monitors that reduce the glare and are good for the eyes.
However, the only concern with buying CRT monitors is that they are heavy and can occupy a great deal of work space. Also, these devices get heated up very easily.
LCD (Liquid Crystal Display) Monitors
Liquid crystal display, also known as liquid crystal diode, is one of the most advanced technologies available at present. Typically, an LCD monitor consists of a layer of color or monochrome pixels arranged schematically between a couple of transparent electrodes and two polarizing filters.
In recent times, LCD monitors have become increasing popular with consumers. Some major advantages of using an LCD monitor include:
- These monitors are compact, lightweight, and do not consume much desk space.
- Secondly, these monitors do not consume much electricity and can even be operated by using batteries.
- Also, the images transmitted by these monitors do not get geometrically distorted and have little flicker
LED (Light-Emitting Diodes) Monitors
LED monitors are the latest types of monitors in the market today. Like LCD, it is again a flat panel display making use of light-emitting diodes for back-lightning instead of Cold Cathode Fluorescent (CCFL) back-lightning used in LCDs.
Other core advantages of LED monitors are:
1. They produce images with higher contrast
2. They have less negative environmental impact when disposed
3. Lifespan and durability of LED monitors is more than CRT or LCD monitors
4. Because of the technology, the monitor panels can be made very thin
5. Do not produce much heat while running
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