Abstract: LED TV is an LCD TV. We are not faced with a new technology and we’re not even talking about the OLED, are totally different things. When we read “LED TV” we are talking about an LCD TV that uses LCD backlight as a variable number of LEDs (depending on the technology and models) instead of the traditional fluorescent lighting.
Why is there so much confusion and misinformation around the LEDs? Simple: there are nowadays various technologies of LED backlighting, and for each of these you can identify a few exceptions. The purpose of this guide / article is to explain everything there is to know about LED TV and understand what are the models available on the market and use LED technology.
LED: why it makes sense
The LED TV nowadays cost more than a traditional backlit TVs, and motivation is undoubtedly the higher cost of production of LEDs compared to lamps. There is, however, to add a particular: a LED consumes much less compared to a conventional LCD (also 40% less) and has a longer duration, even if the duration of the lamps is usually more than enough to complete a cycle product life.
The LEDs, however, also affect the TV’s performance providing better contrast through the use of technologies such as Edge LED Local Dimming and color rendering and more convincing and faithful.
To finish the LED also influence the design and construction processes: thanks to the LED TV is able to build very thin, with a thickness in some cases also testify about 6-7 mm.
The Full LED technology
The first television to have a Full LED backlight has been the Samsung LE40M91. When it comes to technology Full LED means the adoption of a panel that uses LED backlighting instead of the lamps. The two photos below will help you understand how it is made as a backlight lamp and instead made a full LED backlight.
A flat-CCFL lamps: the ones we see on the right are many small neon lamps arranged along the surface
A panel Full LED instead of CCFL lamps are a series of LEDs that cover the entire surface
In a TV Full LED backlight panel uses a series of LEDs arranged in a regular and equidistant to create a single lamp. Creating a Full LED panel is simpler because it is also easier diffusion system: between the LEDs and the liquid crystal panel is placed only a small diffuser that evenly distributes light. Without this fact the image you would see virtually maculata, full of small dots at the LEDs. Usually on the back of a TV Full LED are used a thousand LED, all equidistant between them. It is important to find the right number of LEDs: if he put a few in fact the TV loses uniformity, if they put too much the image becomes too bright.
Full LED technology, however, has a limitation: the impossibility of being able to make really thin screens. To avoid “spots” in fact it is necessary to keep a certain distance between the panel LEDs and the LCD panel. A few manufacturers using special lenses to silicone was able to reduce this distance, however at the present time no one has yet managed to create TV Full Led really thin.
The TV Full LEDs are all the same?
In the field of LED TV Full we have to distinguish different product categories: those using local dimming technology and those who do not use it, those who use RGB LEDs, and those that use regular white LEDs.Combining these four elements we obtain all the different technologies Full LED available.