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WHAT IS OUTPUT ?
Output is data that has been processed into a useful form. That is, computer process data (input) into information (output).
WHAT IS OUTPUT DEVICE ?
An output device is any hardware component that conveys information to one or more people. Commonly used output devices include display devices; printers, speakers, headphones, and earbuds; data projectors; and interactive whiteboards.
DISPLAY DEVICES :
A display devices is an output device that visually conveys text, graphics, and video information. Desktop computers typically use a monitor as their display device. A monitor is a display device that is packaged as a separate peripheral. Some monitors have a tilt-and-swivel base that allows users to adjust the angle of the screen to minimize neck strain and reduce glare from overhead lightning. You can rotate the screen also of the few monitor. Adjustable monitor stands allow you to adjust the height of the monitor. Some have integrated speakers and/ or built-in Web cam. Monitor controls permit users to adjust the brightness, contrast, height, and width of images. Types of display devices include LCD monitors and LCS screens, plasma monitors, and CRT monitors. The following sections discuss each of these display devices.
LCD MONIOTRS & LCD SCREENS.
An LCD monitors is a desktop monitor that uses a liquid crystal display to produce images. These monitors produce sharp, flicker-free images. LCD monitors have a small footprint; that is they do not take up much desk space. LCD monitors are available in a variety of sizes, with the more common being 19, 20, 22, 24, 26, 27, and 30 inches some are 45 or 65 inches
LCD TECHNOLOGY & QUALITY.
A liquid crystal display (LCD) uses a liquid compound to present information on a display device. Computer LCD typically contain fluorescent tubes that emit light waves towards the liquid-crystal cells, which are sandwiched between two sheets of material. The quality of an LCD monitor or LCD screen depends primarily on its resolution, response time, brightness, dot pitch and contrast ratio.
A Plasma monitor is a display device that uses gas plasma technology, which sandwiches a layer of gas between two glass plates. Plasma monitors offer screen sizes up to 150 inches wide and richer colors than LCD monitors but are more expensive. Like LCD monitors, plasma monitors can hang directly on a wall.
A CRT monitor is a desktop monitor that contains a cathode-ray-tube. A cathode ray-tube (CRT) is a large, sealed glass tube. The front of the tube is the screen. A CRT’s viewable size is the diagonal measurement of the actual viewing area provided by the screen in the CRT monitor. A 21 inch monitor, for example, many have a viewable size of 20 inches. CRT monitors produce a small amount of electromagnetic radiation. Electromagnetic radiation (EMR) is a magnetic field that travels at the speed of light. Excessive amounts of EMR can pose a health risk.
A printer is an output device that produces text and graphics on a physical medium such as paper. Many different types and styles of printers exist with varying speeds, capabilities, and printing methods.
TYPES OF PRINTERS.
A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper. Some nonimpact printers spray ink, while others use heat or pressure to create images. Commonly used nonimpact printers are ink-jet printers, photo printers, laser, thermal printers, mobile printers etc.
An ink-jet printer is a type of nonimpact printer that forms character and graphics by spraying tiny drops of liquid ink onto a piece of paper. Ink-jet printers have become a popular type of color printer for use in the home. Ink-jet printers produce text and graphics in both black and white and color on a variety of paper types. The print head mechanism in an ink-jet printer contains ink-filled cartridges. Each cartridges has fifty to several hundred small ink holes. or nozzles.
- Photo Printer
- Laser Printer.
- Multifunction Peripherals.
- Thermal Printers.
- Mobile Printers.
- Plotters and Large Format Printers.
OTHER OUTPUT DEVICES.
An audio output device is a component of a computer that produces music, speech, or other sounds, such as beeps. Three computers used audio output devices are speaker, headphones. Most personal computers and mobile devices have a small internal speaker that usually emits only low-quality sound. Thus, many users attach surround sound speakers or speaker system to their computers to generate higher-quality sounds. Speakers typically have tone and volume controls, allowing users to adjust setting. In many cases, a cable connects the speakers or the subwoofer to a port on the sound card.
A data projector is a device that takes the text and images displaying on a computer screen and projects them on a larger screen so that an audience can see the image clearly. Some data projectors are large devices that attach to a ceiling or wall in an auditorium. Other, designed for the mobile user, are small portable devices that can be transported easily.
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