By BizLED Bureau
September 17, 2015: As the display screens in our smartphones are important for us, the technology behind them is more important. But how many of us are aware of the technology that goes behind the display screens that give us so much of convenience? We just come to know about terms like ?Super AMOLED? and ?Retina Display?. But what actually do they mean? And how advance are these technologies?
Know the LED-based display technologies of your smartphones
The two common types of displays that smartphones have are LCD (liquid crystal display) with LED display and LCD without LED. Here we will talk about the LED display screens.
LED display screens
LED displays are more energy-efficient, as pixels can be turned off while using the display screen. LED displays can control light passing through every pixel, which results in excellent colours that we can see on our screens. Here the colours are more realistic, and blacks being true blacks. As LED display does not require a backlight like a LCD does, these displays are also thinner. However, LED screens are harder to mass-produce than LCDs and are expensive than LCD, but they are more advanced and much more energy-efficient.
First, LED display panels have white LEDs instead of coloured ones. This is the reason why they are called WLEDs (white LED displays). Then came coloured LEDs, in three colours primarily?red, green and blue?later this was known as RGB LED displays. These panels are easy for the eyes since they give better colours than WLED.
Now the latest is OLED (Organic Light Emitting Diode). So many smartphones are using OLED as well, which makes the smartphone a little more expensive. OLED means the material between the two polarising sheets are carbon-based.
University of Michigan researchers have extended the lifespan of blue OLED by a factor of 10. This also leads to longer battery life in cellphones. This extension in lifetime improvement will also help prevent blue from dimming to red and green over time.
Blue OLEDs are one of a trio of colours used in OLED displays such as smartphone screens.
The improvement means that the efficiency of blue OLEDs could jump up from around 5% to 20% or even better in the near future.
OLEDs are very suitable in display technology, making screens to be extremely thin and curved, with no blurring of moving objects, and it has a wide range of viewing angles.
In these RGB displays, every pixel contains green, red and blue modules that shine at different levels of brightness to give out the desired colours.
But not all OLEDs have the same features. Phosphorescent OLEDs, which are also known as PHOLEDs, produce light through a method that is at least four times more efficient than fluorescent OLEDs. Red and green PHOLEDs are being already used in Samsung and LG smartphones.
AMOLED (Active-Matrix Organic Light-Emitting Diode) is the most common iteration of OLED displays used in smartphones. AMOLED are more efficient and better looking than regular OLED screens. AMOLEDs give bright colours, higher brightness, and more battery-efficient.
The first generation Nexus phone has AMOLED displays. Then Nokia offered Lumia 900 with AMOLED panel. Later, a number of Samsung cellphones used this display panel?specifically Galaxy S series.
Super AMOLED is a version of an AMOLED screen made by Samsung. Usually when creating smartphone screens, another layer has to be added to the display to allow for touch interaction of the screen. Samsung included this layer into the creation of the display itself, making it not only the thinnest display in the market, but also the brightest and least power consuming.
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