of technologies such as TFT-LCD, LED, OLED, and more. Internal display Almost all mobile devices incorporate an internal display. These internal displays are connected to the computer through an internal display interface such as LVDS or eDP. The chief advantage of these displays is their portability. Terminal Prior to the development of modern pixel-oriented displays, computer terminals were used, composed of a character-oriented display device known as a VDU and a computer keyboard. These terminals were often monochromatic, and could only display text. Rudimentary graphics could be displayed through the use of ASCII art along with box-drawing characters. Teleprinters were the precursors to these devices. Projector A projector is a display that projects the computer image onto a surface through the use of a high power lamp. These displays are seen in use to show slideshow presentations or in movie screenings. Technologies Display technologies can be classified based on working principle, lighting (or lack thereof), pixel layout, and more. Cathode ray tube (CRT) CRT screens produce an image using electron tube, which fires electrons at a phosphorous coated screen to light up pixels in order to display images. Liquid crystal display (LCD) An LCD is a display technology employing the use of liquid crystals to form images. Thin-film transistor (TFT) A TFT refers to the thin layer of transistors used with an LCD. LED-backlit LCD An LCD display which uses LEDs as a backlight. Prior to the use of LED based backlighting, Cold Cathode Fluorescent (CCFL) tubes were used. LED display LED displays use an array of LEDs to form an image. Organic Light Emitting Diode (OLED) Unlike an LED display, an OLED display does not use a backlight. Electronic paper (e-ink) An e-ink display uses encapsulated pigment to form an image resembling printed paper, commonly used in e-book readers. Color output Monochromatic display A monochrome display is a type of CRT common in the early days of computing, from the 1960s through the 1980s, before color monitors became popular. They are still widely used in applications such as computerized cash register systems. Green screen was the common name for a monochrome monitor using a green "P1" phosphor screen. Colored display Color monitors, sometimes called RGB monitors, accept three separate signals (red, green, and blue), unlike a monochromatic display which accepts one. Color monitors implement the RGB color model by using three different phosphors that appear red, green, and blue