Technical features of the LED and LCD TVs
The LED TVs are special types of LCD TV, but which differ from the latter for the type of backlight. In fact LEDs are used instead of the lamps to illuminate the panel as occurs for traditional LCD. This type of cutting-edge technology results in a marked improvement of the images, with a greater range of colors, which are also the most crystalline, you also have lower power consumption and thinner TV. However, the cost of the LCD screens to LED is higher.
WHAT IS THE DIFFERENCE BETWEEN
The LCD (Liquid Crystal Display) or liquid crystal displays, are very common nowadays on televisions, computer monitors, some watches, mobile phones and microwave ovens. The main advantage of LCD technology is in the pictures, which are the result of the orientation of the liquid crystals which are composed of individual cells that make up the screen; also other key feature is the source of exterior lighting. The LCD screen is based on a system of three primary colors that constitute each pixel, however, the liquid crystals do not emit any light of its own, and it is for this reason that requires a source of backlight for this purpose are used CCFLs, ie the lamps cold cathode fluorescent.
LCD TV.
These models of LCD screens are much thinner and lighter than the old CRTs (cathode ray tube), require less energy and do not emit electromagnetic radiation, also this type of technology allows you to make pictures brighter, higher resolution and a flicker-free display , useful for eye health. For proper operation, the light from the backlight must be non-polarized white light. The main disadvantages of LCD screens relate to the diagonal of view: in fact, the light must pass through two stages of polarization before reaching our eye, so not very wide. Another problem concerns the contrast and the intensity of black, which is not excellent: the LCD system in the black does not consist in an absence of light, but in the masking of the backlight. LCD technology may have latency issues, in fact there is a bit 'of time before the liquid crystal state changes, sometimes there is also the possibility that you burn the pixels.
LCD TV LED.
The screens LED (Light Emitting Diode) are a special type of LCD screen, but with a different type of backlight to illuminate the screen it uses LEDs instead of traditional bulbs. LEDs emit colored light using less energy and space than traditional bulbs. If used for the backlight of an LCD screen can be white light, but also red, green and blue (RGB LED). This kind of technology involves the production of LED TVs to become thinner and better appearance, a higher contrast with deep blacks, a wider color gamut and more crystalline, lower energy consumption, no mercury and therefore eco- greater sustainability. There are two types of LED LCD TV:
- EDGE LED, the LEDs are placed only on the sides, like the lamps of the common LCD. In addition, the black is more intense and have a higher dynamic contrast ratio;
- FULL LED: LEDs have many more uniformly distributed throughout the panel (may be even thousands). Having more lamps determines the increase of the thickness, that in the EDGE LED is very minimal, but allows to have a better handling of the blacks with the ability to selectively turn off groups of pixels that should remain blacks and not only to block the passage of light through LCD cells.
The duration of the LCD screen LED is on the order of 100,000 hours while that of a conventional screen is 50 thousand hours. However televisions based on this type of technology have significantly higher costs.
10/02/2012
----------------------------------------
Translated via software
----------------------------------------
Source:
Italian version of ReteArchitetti.it