OUTPUT DEVICES & FUNCTIONS PRESENTED BY EBIN JOSE PULLATTU
Computer output devices are used to provide information for a user in different forms. The formats include visual, audio and digital. A CPU is responsible for processing the instructions and the devices are responsible in outputting the processed information in different formats depending on the type of output device we have . In the world of computers, input/output (I/O) refers to the communication between a computer and the user.
Input is the data sent to the system, whereas output is the data sent by the system to the outside world. Computer output devices are computer hardware equipment, that are used to communicate the results of data processing carried out by a computer to the user. There are a number of devices, which produce data in different forms, which includes audio, video or hard copy. Light is passed through liquid crystals to create the pixels.
Output device of computer are types of peripheral hardware connected, that is connected to the computer, either using cables or over a wireless network .
Monitor The most common computer output device is the monitor or computer screen. Monitors create a visual display from processed data that users can view. They come in a variety of screen sizes and visual resolutions There are two types of computer monitors, CRT and flat panel. CRT monitors use phosphorescent dots to create the pixels that make up display images. Flat panel monitors usually use LCD or plasma to create output.
All monitors rely on a video card that is located on the computer motherboard or in a special expansion slot. The video card processes the computer data into image details that the monitors can display. A monitor is also called as video display terminal (VDT). The visual display of the processed data, which the users can view is got through the monitor. Computer monitors come in a variety of screen sizes and not to forget visual resolutions.
All monitors rely in a video card, which is located on the motherboard to display the information. It is the video card, which processes the data into images, which is eventually displayed on the monitor.
Speaker Computer speaker is the other output device which is used to hear a sound played by a computer. Speakers can be built in with the motherboard or comes as a separate part. It connects with the computer speaker with a cable. Unlike the old speaker’s types, modern speakers come with USB connection which does both functions – connection and power supply.
The built in speakers can be heard through a headphone, if you don’t want to buy the independent speaker set. Headphone is also an output device used to hear music from digital portable players, such as MP3 players, I Pods and stuff like that. It is designed to fit into an ear. It is also used mostly to play computer games and chat on line.
Audio data is created by the computer and then sent to the audio card, which is located in an expansion slot. The card translates the data into audio signals, which are sent to the audio output device.
Printer Printer enables us to get computer output on paper. It is one of the most popular computer output devices we often use to get information on paper - called hard copy. Generally, there are two types of printers: laser and ink jet/desk jet. Wide varieties of printers are available under these groups which incorporate different capabilities, features and price.
Usually, laser printers are monochrome (black and white), but colour laser printers are also available. It is faster than the ink jet printers and very expensive, particularly if it has both monochrome and colour printing features. When you want to buy a printer, your choice must start from laser types.
Though laser printer is expensive at first purchase, but in the long run it handles large volumes of printing with low operating cost. On the other hand, ink jet printer requires minimal initial investment but has high operating cost. Ink jet printer is a requirement if you are into graphics and desktop publishing business. HP, the leader in printer industry, recently announced a new printer which outranks the existing ones.
The new HP Laser Jet printer 1100 works by Plug and Play, it doesn't need driver CD. It also saves 72% of electric consumption by automatically turning itself on and off. Laser Jet Printer
Projector It is a hardware device, with which an image like a computer screen is projected onto a flat screen. Image data is sent to the video card, by the computer which is then translated into a video image and sent to the projector. A projector is often used in meetings or to make presentations, because they allow for a large image to be shown, with which the display is available for a large audience.
Plotter Plotters, like printers, create a hard copy rendition of a digitally rendered design. The design is sent to a plotter through a graphics card and the image is created using a pen. In simple words, plotters basically draw an image using a series of straight lines. This computer output device is used with engineering applications.