HD Ready, Full HD, HD LCD TV

HD Ready, Full HD, HD TV
After asking  about the technology of our future LCD screen, this one question occurs : is it  capable of displaying HD programs? For this you need to know the labels currently in use. They are threefold: the label “HD Ready” label “HD TV” and the label “Full HD” (although it is not certified). Note that only these three labels deserve to be mentioned, the logo “HD Ready” does absolutely no guarantee on the quality of the screen, quite the contrary . The name “HD-Ready” it applies to the broadcaster (on screen) and is characterized by a set of technical constraints that must be met by that statement on television. These obligations relate to the physical connectivity and display capabilities including, as we shall see now.

Sources and Resolutions
In terms of display, a TV “HD Ready” is a 16:9 screen, with 720 lines at a minimum. For information, CRT TVs have a resolution of 576 lines for 720 points per line. The gain in detail is therefore logical. But it is even more when talking about a television “Full-HD, which should display 1920 pixels over 1080 lines. This resolution is the only one that can certainly help you enjoy the richness of a program broadcast in high definition. Indeed, if a digital signal has a higher resolution than your TV is displayed, it will be with a loss of information that will be more important than the definition of the screen away from the signal (known as “downscaling”).

This type of loss is less dramatic, however, that the opposite case, which will see a poor signal quality (that of a conventional analog tuner for example) to get on TV, “Full-HD”. The program will then be extrapolated to “fill” your screen, and even the best treatments will not offer a correct picture (referred to as “upscaling”). It is still rare these days to take advantage of the resolution of a screen full-HD content via broadcast without scaling involving the loss of some data. However, through game consoles (eg Xbox 360) or HD-DVD or Blu-ray you can get beautiful images that will tap the screen optimally and in its full resolution.

The sources used by consumers are therefore very varied, manufacturers of flat screens have made  a compromise to avoid losing too much quality when watching a program “Full-HD, and do not use too much extrapolation when displaying a program SD (standard resolution of 720×576). The resolution  best able to meet these criteria would be 1280×720. However, in order to provide compatibility , data signals with XGA (1024×768 pixels), is a definition of 1366×768 you will find frequently for many LCD models.

Regarding plasma displays, many televisions have a resolution of 1024×768 hybrid, which will display (after a very slight “downscaling”) a high definition signal. But one can also find this type of screen resolution of 1366×768 mentioned previously, and the definition of “queen” of 1920×1080, which is necessary to obtain an image of “full HD”.

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