When it was all invented and seems to add to your Favourite televizoinnyh technology has nothing more to producers remains nothing new, how to combine the old operating. The so-called LED TV – a new look at old solutions.
What is LED-TV?
Manufacturers in the mass dissemble, giving mysterious LED TV for quite trivial LCD, in which the only change – conventional fluorescent backlight LED. And, although the change is really quite important, should not cause confusion.
The winter of 2009 the British Advertising Standards Authority banned advertisements for Samsung to use the term «LED TV» – as the company several distorts reality and thereby mislead consumers. Later the organization was allowed to use it, but demanding, explanations in advertising – that is used LED-lights, and not unknown LED-display of the new type.
However, in other countries claims to virtually no advertising. Moreover, the new term used not only Samsung, but LG, Toshiba, Sharp, etc.
What are the types of LED-backlighting?
Main types of LED-backlight two. First, it is back lighting. «White» LED-elements (White LED) located on the sides or on the perimeter of LCD-display, and for uniform distribution of light corresponding to the special pad.
The second, more expensive way – placing LED-elements directly for LCD-substrate. Such type of elements typically uses three colors – red, green and blue (RGB Led). Produce such a system using “white” elements unprofitable, although it is possible that there are (or met) and such models. More intelligent lights – depending on the color of the original image, a fragment of the screen is illuminated with a particular color. However, and other technology have both advantages and disadvantages.
Advantages and disadvantages of LED
First, all types of LED-backlighting allow seriously save energy – electricity consumption is almost half less than comparable LCD-TVs. Especially for models with side illumination.
However, it is worth remembering that the average LED worth twice as much as LCD or “plasma” (sometimes more), so these savings will pay off unless by that time when no LED, plasma and LCD is perhaps not at all.
Secondly, unlike fluorescent backlights, LED contains no mercury. However, even here there are pitfalls. Instead it uses gallium and arsenic – is not the most healthy elements of the periodic table.
White LED (with side illumination). Such a system is much cheaper than the RGB-LED, but its characteristics, it is close enough to normal LCD (see chart). Its main advantage – the ability to issue really thin displays, in some cases less than 10 mm. However, the ability to adjust the backlight on different parts of the screen is missing, not to mention the multi-color illumination.
RGB LED. Really quite interesting option used in some models (eg, Sony) for several years. Because the system provides colored lights separate fragments display image is extremely sharp and incredibly contrast, in the current model to 1,000,000:1 and even higher. Guaranteed a deep black color – with the ability to completely disable individual plots.
Color gamut of different types of illumination
However, there are problems here. The number of elements of illumination is limited to about a thousand, and control every element is too difficult and expensive. Therefore, they are disabled groups. As a result, light disappears and part of the scene, which should be bright.
However, RGB LED still provides a much richer colors than LCD or even `white` LED, however, and worth while disproportionately expensive.
It has become the reason that many companies, including Samsung, waive in favor of RGB LED backlight side – it simply sells better because of the relatively low price of TVs.
Choosing to do is not easy. Additional razberihu market made in the spring of 2009 the company Toshiba. According to her spokesman Yuji Motomura (Yudji Motomura), in fact, “white» LED is much more efficient than RGB and soon it it will go into the mainstream. However, Toshiba may simply not know how to make cheap RGB LED elements.