Updated: Feb 20
Output devices are those devices which provide the result in hardcopy or soft copy. There is some most important output devices are:
4. Multimedia projector
5. Speech synthesizer
There are two types of Monitors which are below:
1. CRT (Cathode Ray Tube)
2. TFT-LCD (Thin Film Transistor Liquid Crystal Display)
A VDU (Visual Display Unit) or CRT monitor is like to a television and its size is calculated in diagonal length of the screen. Monitors are obtainable in 12”, 14”, 15” 17”, 19” and even in 21” size. It provides text or picture in colour or black and white, depending on the type. Colour monitors has more cost than black and white monitors. Anything we type on the keyboard, we can see it on the monitor.
LCD monitor is the flat panel type of monitor initiate on notebook PC. TFT-LCD is a alternative of liquid crystal display which uses thin film transistor technology to get better image quality. TFT- LCD is one type of dynamic matrix LCD. It is used in televisions, flat panel displays, projectors etc.
TFT-LCD has a sandwich like structure with liquid crystal packed between two glass plates. TFT glass has as lots of TFTs as the number of pixels displayed, while a colour filter glass has colour filter which generates colour. Liquid crystals move according to the variation in voltage between the colour filter glass and the TFT glass. The amount of light supplied by back light is resolute by the amount of movement of liquid crystals in such a way as to produce colour.