What is a Display Screen?
A display screen (screen, display, or monitor) is a data processing and output device or a part of an output device for displaying visual information. In comparison to the video projector, which projects the visual on to an external surface, a display screen’s display is directly visible on the device itself.
Different types of Display Screens
CRT (Cathode Ray Tube) screens operate with an intense, high-energy electron stream which is used to form images on a fluorescent screen. A cathode ray tube is basically a vacuum tube containing an electron gun on one end and a fluorescent screen on the other. Although CRT monitors are still found in some organizations, most have stopped using them because they are heavy, bulky, and expensive to replace.
The LCD (Liquid Crystal Display) screen is the most common screen found on computers, televisions, tablets, smartphones, digital cameras, etc. As the name suggests, it works using liquid crystals that are used as a polarizing filter for light. It is therefore a passive display system, which does not produce light, but which operates by backlighting (either by neon or by LEDs). Hence the brightness is limited which may prevent visibility in direct sunlight.
Plasma display screens use small cells of charged gas to create an image. These cells are similar to household fluorescent bulbs. Each plasma cell creates its own lighting, eliminating the need for a separate backlight and giving PDP monitors high contrast. Plasma is mainly found in TVs or other professional electronic display items. It has the advantage of being less limited in terms of size (up to 3m80 diagonal) and has a better contrast with a wide viewing angle (+ 160 °).
LED (Light Emitting Diodes) are flat screens or slightly curved displays that use light-emitting diodes for the backlight. LED monitors consume much less power than most other screens and are considered to be much more environmentally friendly. LED monitors produce images with a high contrast, have less negative impact on the environment when thrown away, are more durable than CRT or LCD monitors, and have a very slim design.