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Introduction
Display systems are the focal point of any human-machine interface.
It is an Essential Component.
Applications
The role of electronic displays is becoming increasingly crucial consumer electronics, Information processing, Entertainment, Intelligent offices/homes.
Conversion of electronic signals to specific location.
Adjust images to the color.
Direct view enable user to view screen directly.
By using Optical devices magnifies and displays on larger screen.
CLASSIFICATION OF DISPLAYING DEVICES
Light emitting devices
eg : CRT’S , electro luminescent (EL), vacuum fluorescents displays (VFD’S)
Non Light emitting devices
eg : liquid crystal displays (LCD’s) and electro chromic displays (ECD’s)
TYPES
TOUCH SCREEN
LASER IMAGING
ORGANIC EL DISPLAY
LCD’S
VFD’S
POLYSTER PANELS
3D DISPLAYS
OPTICAL FIBERS
Touch Screen is a input device
Shonkh Technologies developed information with LCD/CRT touch screens
Working
it includes touch sensor (to receive), electronic controller (convert i/p to conv. Bus protocol )& software driver (to convert the bus information to cursor action), and system utilities .
Applications - ATMs, and casino gaming
A German company has developed laser imaging Technology
Laser beams travel over the screen
These provide clear, non-reversed images on the screens of any size
It is high speed photograpy
Laser can be formatted into a thin sheet of light
ORGANIC EL DISPLAY
This is emitting their own light also provide wide view angles
Quick response speed
Researchers in Japan with compounds having low molecular weights, developed element technologies necessary to create organic EL displays. They brought out an organic EL display for car radios
These use fluorescent organic compounds as Luminescent materials
LCD’s
LCD Stands for Liquid Crystal Display
Manipulates existing light to produce an image where as CRT, plasma emit light .
Color Display
Advantages - widespread use of notebook computers
drawbacks
VFD’s
VFD stands for vacuum fluorescents displays
Invented in 1966
It is a chip
It is multi color display
Applications – telecom, medical, home appliances, vending machines, point of sale
POLYSTER PANALS
Introduction - Researchers have developed thin-film transistor displays out of polyethylene terephthalate thin, flexible and rugged plastic can be rolled up, folded, or bent it practically any shape desired
Applications
notebooks,video-games,non-conventional displays.
ADVANTAGES
digital watches
finger tops
palmtops, laptops
mobile phones
digital cameras
PC monitors, and TV’s