Output Devices Chapter Notes | Computer Science for Class 6 PDF Download

Monitor

As we've learned previously, a monitor is a device on which images are generated by the computer's video adapter. It is connected to the video adapter via a cable. Monitors can have two types of screens: color screens and monochromatic screens. Color screens typically display 256 colors from a selection of 256,000 choices. On the other hand, monochrome monitors display only a single color, such as black, white, green, or amber, and are used to display multimedia objects or text graphics in that single color.

Display Devices

• Liquid Crystal Display (LCD): The LCD, commonly found in digital watches and calculators, is energy-efficient and ideal for battery-powered devices due to its low power consumption.
• Cathode Ray Tube (CRT): The CRT is a traditional display technology used in television and computer screens, utilizing an electron beam within a vacuum tube.
• Thin Film Transistor (TFT): TFT technology, also known as Active Matrix, is widely adopted for vibrant color displays in electronic devices.

Printer

Printers are essential output devices that produce hard copies of digital content, including text and images, offering a tangible form of information delivery.

Impact Printer

• Definition: Impact printers are devices that produce text or images by physically striking an inked ribbon against paper.
• Explanation: These printers work by creating an impression on paper through direct contact between the printing mechanism and the paper surface.
• Examples: Daisy wheel printers and Dot Matrix printers are common types of impact printers.

Non-Impact Printer

• Definition: Non-impact printers utilize technologies such as thermal, magnetic, or laser to produce text or images without direct physical contact with the paper.
• Explanation: Unlike impact printers, non-impact printers do not strike the paper to create output, leading to quieter operation and often higher quality prints.
• Examples: Inkjet printers, electromagnetic printers, thermal printers, and laser printers fall under the category of non-impact printers.
  • Laser Printer Example: The first laser printer was introduced by Xerox Corporation in 1971, utilizing laser technology and an electro-photographic drum to produce high-quality images on paper.
  • Inkjet Printer Example: Canon developed the inkjet printer, which deposits tiny droplets of ink on paper to create images, with dot diameters ranging from 50 to 60 microns.