You may not realize it but you probably see about a dozen electronic displays every day of your life. Every time you watch television, look at your alarm clock, tune in your car radio, read an electronic billboard, ride your electronic exercise bike, use a treadmill and play your DVD player you are witnessing an electronic display. Basically electronic displays are used all over the world to show people a simple visual indication of the output from an electronic device. This is very useful as the display gives us an instantaneous readout of the process. Electronic displays are commonly used in electronic instruments, audio/video equipment, illumination, hoardings, signs, ticker tape displays in stock markets, airports, railway stations, etc.
There are a variety of electronic displays some of them are:
- LCD Displays: These use twisted liquid crystal layers that are placed in between filters. These displays have a very high resolution and are used in high-end monitors.
- LED Displays: These uses light emitting diodes. LEDs have a very long life and they consume relatively little power.
- VFD displays: These are vacuum fluorescent displays and are bright with wide viewing angles.
Electronic displays also come in both analog, symbol and digital forms. For easy human readable information, digital, analog, and symbol display methods are all very useful. If you are looking for an instant readout or signal, analog meters and indicator lights often convey the information very quickly. A lot of people will quickly look at their analog wrist watch or clock to find out what time it is or look at an automobile dashboard to find out they are low on fuel.
However, when you are looking for accuracy then digital electrical displays are usually better. The task of reading analog meters can take a bit of time and require some know how, but writing down the value on a digital display is simply a case of copying down the numbers. In most instances where both accuracy and quickness are needed, dual displays are often used.
The important parameters to be considered in electronic displays are: the number of characters to be displayed; the type of characters like alpha numeric, alpha, numeric, graphics, special characters, the illumination color, the input voltage, the power consumed and the distance from which people would be viewing the display from, etc.