The introduction of LCDs and LEDs in display screen markets has started a revolution in the display market. The post deals with OLEDs the next generation of displays.
It all started in 1925 when John L. Baird gave the world a gift known as television, a gift which became a part of almost everyone’s life. From black and white to color, from giant massive boxes to LCDs and LEDs in everyone’s home; we have seen a lot of changes in the source of world’s most common media source.
We all have witnessed the evolution of TVs from huge boxes to slim and sexy LCDs and LEDs today.
The question is what’s next?
And the answer is OLED (organic light-emitting diode) in front of which the TV sets in your living rooms will look like stone age stuff. OLED Technology in televisions, computer monitors, mobile phones and pretty much anything will revolutionize the electronic market.
In simple terms, OLEDs are created from organic materials that emit light when power is passed through them. An OLED display contains thin films of organic materials placed between two conductors and as the current passes through it, the displaylights up. This self-illuminating function removes the need for the backlightthat is an essential requirement of a traditional LCD screen.
There are two kinds of OLED displays, PMOLED (passive matrix) and AMOLED (active matrix).
AMOLED is designed for larger displays (of over about three inches) and are driven by a TFT which contains a storage capacitor that maintains the line pixel states, and so enables large size (and large resolution) displays and allows each individual pixel to be controlled separately.
A PMOLED display uses simple control scheme in which you control each row (or line) in the display sequentially (one at a time). PMOLED electronics do not contain a storage capacitor and so the pixels in each line are actually off most of the time. One needs to use more voltage to make them brighter.
AMOLEDs can be made much larger than PMOLED and have no restriction on size or resolution.
The pros of OLED displays over LCDs in our homes are:-
No requirement of backlight or light source
This leads to an immediate consequence that these devices can be made thinner: – a zero-Inch LCD-TV needs a backlight large enough tospan and light on theentire surface of the screen evenly.
Without this problem, the same sized OLED-based TV couldbe little more than an inch thick, and as miniaturization of the other components powering devices develops further, they will only continue to get thinner.
The next benefit is that due to the absence of light source, an OLED screen draws less power. While a black image on an OLED display directly corresponds to the brightness of each individual pixel. Hence if OLED screens are used in mobile devices battery will be saved.
The resultant image quality of OLEDs is highly superior and contrasting as compared to LCDs and LEDs.
Companies like Sony and Toshiba have created screens that measure less than half amillimeter thick. The day is near when computers will be rolled, folded and can be kept in our pockets.
Soon the wait will get over and these OLEDs will replace THE LCDs and LEDs in our living rooms