Download Output Devices of Computer and more Study notes Computer Science in PDF only on Docsity! Computer - Output Devices Monitors Monitors, commonly called as Visual Display Unit (VDU), are the main output device of a computer. It forms images from tiny dots, called pixels that are arranged in a rectangular form. The sharpness of the image depends upon the number of pixels. There are two kinds of viewing screen used for monitors. Cathode-Ray Tube (CRT) Flat-Panel Display Cathode-Ray Tube (CRT) Monitor The CRT display is made up of small picture elements called pixels. The smaller the pixels, the better the image clarity or resolution. Flat-Panel Display Monitor The flat-panel display refers to a class of video devices that have reduced volume, weight and power requirement in comparison to the CRT. The flat-panel display is divided into two categories − Emissive Displays − Emissive displays are devices that convert electrical energy into light. For example, plasma panel and LED (Light-Emitting Diodes). Non-Emissive Displays − Non-emissive displays use optical effects to convert sunlight or light from some other source into graphics patterns. For example, LCD (Liquid-Crystal Device). Printers Printer is an output device, which is used to print information on paper. There are two types of printers − Impact Printers Non-Impact Printers Impact Printers Impact printers print the characters by striking them on the ribbon, which is then pressed on the paper. These printers are of two types − Character printers Line printers Character Printers Characteristics of Non-impact Printers Faster than impact printers They are not noisy High quality Supports many fonts and different character size Laser Printers These are non-impact page printers. They use laser lights to produce the dots needed to form the characters to be printed on a page. Inkjet Printers Inkjet printers are non-impact character printers based on a relatively new technology. They print characters by spraying small drops of ink onto paper. Inkjet printers produce high quality output with presentable features. They make less noise because no hammering is done and these have many styles of printing modes available. Color printing is also possible. Some models of Inkjet printers can produce multiple copies of printing also.
