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 display
lights up. This self-illuminating
function removes the need for the backlight
that 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 to
span and light on the
entire surface of the screen evenly.
Without this problem, the same sized OLED-based TV could
be little more than an inch thick, and
as miniaturization of the other
components powering devices develops further, they will only continue
to get thinner.
Consumes Less Power
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.
High Image Quality
The resultant image quality
of OLEDs is highly superior and contrasting as compared to LCDs and LEDs.
THE FUTURE
Soon the wait will get over and these OLEDs will replace THE LCDs and LEDs in our living rooms
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