Output devices
Output devices are components of a computer system that provide information or results from the computer to the user or other devices. They convert electronic data generated by the computer into a human-readable or usable form.Monitor/Display: Displays visual output such as text, images, and videos. Types include CRT (Cathode Ray Tube), LCD (Liquid Crystal Display), LED (Light Emitting Diode), and OLED (Organic Light Emitting Diode) monitors.
Printer: Produces hard copies of documents or graphics on paper. Types include inkjet, laser, dot matrix, and 3D printers.
Speaker: Produces audio output such as music, system sounds, and spoken words. Commonly used for multimedia applications and gaming.
Projector: Displays computer-generated images or presentations on a larger screen or surface.
Plotter: Draws vector graphics on paper based on computer commands. Used for large-scale drawings and architectural designs.
Types of Printer
A. Impact printers, as the name suggests, work by physically impacting the paper to create characters or images.
A1. Dot matrix printers: They use a print head with a grid of tiny pins that strike an ink ribbon to create dots on the paper. These dots are then arranged to form characters and images.
A2. Daisy wheel printers: They use a rotating wheel with pre-formed character shapes on the spokes. The wheel presses against an ink ribbon and the paper to print the characters.
A3. Drum Printer: used a rotating cylinder (drum) with pre-formed character shapes raised on its surface. As the drum rotated, the characters came into contact with an ink ribbon and then the paper, transferring the ink and creating printed text.
A4. Chain Printer:It uses a continuous loop of metal chain, similar to a bicycle chain, with embossed characters on each link. This chain loops around two gearwheel, creating a path for the chain to move horizontally across the printing area.
A5. Band Printer: Instead of a chain, a band printer uses a continuous loop of metal with pre-formed character shapes etched onto it. This band rotates horizontally around a set of hammers, one for each print column.
B. Non-Impact Printer: like laser and inkjet printers that use heat, light, or electrical charges to transfer ink onto the paper without direct contact.
B1. Inkjet printers are a popular type of printer known for their versatility and affordability. They work by spraying tiny droplets of ink onto paper to create images and text.
B2. Laser printers are another popular type of printer known for their fast printing speeds, crisp text quality, and high efficiency.A laser beam scans across a light-sensitive drum inside the printer, creating an electrostatic image corresponding to the desired print.
B3. Thermal Printers: known for their compact size, quiet operation, and specialized applications, offer a distinct alternative to more common printer types like inkjet and laser.Coated with a chemical that changes color when heated.
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