Display types:
1) Cathode
ray tube (CRT)
A CRT works by moving of an
electronic beam or electronic gun (a source of electrons or electron emitter)
through a vacuum tube which hits the fluorescent screen and thus forms the
images, electrical waveforms, radar targets etc.
2) Plasma
display panels (PDP)
A PDP is common for large displays
(normally about 30 inches i.e., 76cm). This technology utilizes small cells
containing electrically charged ionized gases. These gases are colorless,
odorless, tasteless, and non flammable under standard conditions and have
extremely low level of reactivity.
3) Liquid
crystal display (LCD)
A LCD is electronically modulated
optical device made up of any number of pixels filled with liquid crystals.
Each individual pixel is divided into three cells, or sub pixels, which are
colored red, green and blue using pigment filters, dye filters and metal oxide
filters.
In this there are two types:
i)
Thin film transistor (TFTLCD)
ii)
High performance Addressing (HPALCD)
4) Light
Emitting diode (LED)
A LED is a semiconductor diode that
emits incoherent narrow spectrum light when electrically biased.
5) Organic
LED (OLED)
A OLED is also light emitting
polymer (LEP) or organic electro luminescence (OEL). In which the emissive
electroluminescent layer is a film of organic compound which emits light in
response to an electric effect.
