Displays

A display is any technology, which allows for the visualization of an input signal. Traditionally, displays are associated with computers or other electronics whereas televisions are associated with home entertainment. But their underlying technology is the same, and the modern television is essentially just a display with additional features for convenience.
Early displays were based on cathode ray tube (CRT) technology. The analog input signal controlled one or more electron guns inside a vacuum tube. The guns steered their electrons onto a phosphorescent screen that was could be then viewed. Most CRT displays were in the 4:3 aspect ratio. CRTs are a purely analog technology and have largely been displaced by new technology.
Most “flat panel” displays are based on liquid crystal display (LCD) or light-emitting diode (LED) technology. They are lighter, flatter, and more power-efficient than CRT displays. Initially appearing as monochrome displays for laptop computers, they are now the dominant display technology. Flat panel displays have a maximum resolution, which defines the overall number of pixels the display contains. Common display resolutions are 1920 x 1080 (1080p) or 3840 x 2160 (4K). Almost all flat panel displays are in the widescreen aspect ratio: 16:10 or 16:9. Flat panel displays can be driven by a number of cable formats: component video, composite video, VGA, DVI/HDMI, Display Port, etc.