What is the purpose of an output device? Explain the different features of CRT and LCD monitors.

Purpose of an output device different features of CRT and LCD Monitors.

Output Devices

The hardware components that are used to receive information from the computer are called output devices. Output devices take information from the computer and convert it in a form that is understandable by the display devices, printers, speakers and headphones.

A printer is an output device that prints characters, symbols and graphics on paper. The printer output is called hard copy. Print resolution is commonly measured in dots per inch (DPI).

The printer must be user friendly. It means that it should easy to use and understand. The printer must be reliable.

CRT

This monitor uses a cathode ray tube (CRT).

CRT tube creates an image on the screen using a beam of electrons. CRT consists of one or more guns that fire a beam of electrons inside the screen. The screen is coated with very tiny phosphor dots from inside. These guns generate red, green, and blue (RGB).

LCD

A liquid crystal display (LCD) uses charged liquid crystals between two sheets of material such as glass or plastic to light up the appropriate pixels to form the image on the screen. LCDs provide a sharper picture than CRTs and emit less resolution. It also requires less power and take up less space than CRT.

What is the purpose of an output device? Explain the different features of CRT and LCD monitors. Purpose of an output device different features of CRT and LCD Monitors.