<P> Some LCD screens are backlit with a number of light - emitting diodes (LEDs). LEDs are two - lead semiconductor light source that resembles a basic "pn - junction" diode, except that an LED also emits light . This form of LCD (liquid crystal display) is the most prevalent in the 2010s . The image is still generated by the LCD . </P> <P> A plasma display consists of two glass plates separated by a thin gap filled with a gas such as neon . Each of these plates has several parallel electrodes running across it . The electrodes on the two plates are at right angles to each other . A voltage applied between the two electrodes one on each plate causes a small segment of gas at the two electrodes to glow . The glow of gas segments is maintained by a lower voltage that is continuously applied to all electrodes . In the 2010s, plasma displays have been discontinued by numerous manufacturers . </P> <P> In an electroluminescent display (ELD), the image is created by applying electrical signals to the plates which makes the phosphor glow . </P> <P> An OLED (organic light - emitting diode) is a light - emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound which emits light in response to an electric current . This layer of organic semiconductor is situated between two electrodes; typically, at least one of these electrodes is transparent . OLEDs are used to create digital displays in devices such as television screens, computer monitors, portable systems such as mobile phones, handheld game consoles and PDAs . A major area of research is the development of white OLED devices for use in solid - state lighting applications. (1) (2) (3) </P>

Short note on flat panel display in computer graphics