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Knowledge About LED Display Brightness and Gray Level

Date: 2015-08-17
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  For very little contact with the LED display screen, LED display technology is a matter of deep to understand, even the friends often contact LED display, believe in LED display gray and brightness are not fully known. Below we will come together to understand the knowledge of the LED display brightness and gray.
  Gradations of color LED display is gray or gray, is refers to the brightness of light and shade degree. For digital display technology, gray level is to display the number of colour is the decisive factor. In general gray level is higher, shows the more colorful, the picture is more exquisite, more show the rich details.
  Led display gray level mainly depends on the A/D conversion system. Of course system of video processing chip, storage and transmission system to provide all the support of the digits. At present domestic LED display mainly adopts eight processing system, namely 256 (28) grey level. Simple understanding is a total of 256 from black to white brightness changes. Use RGB trichromatic can constitute a 256 x 256 x 256 = 16777216 colors. Known as the 16 million colors. International brand display mainly adopts 10 processing system, namely a level 1024 grayscale, RGB color can comprise 1.07 billion colors.
  Gray though is to determine the number of color the decisive factor, but we also don't want to enlarge its unlimited. Because first of all, the resolution of the human eye is limited, moreover the improvement of system processing digits involving system video processing, storage, transmission, scanning the change of each link, such as costs, price declines. In general civil or commercial grade products can be used in a 8-bit systems, broadcast products can use 10 systems.
  Brightness identification level
  Brightness identification level refers to the human eye can distinguish between the image from the black to the white brightness level. Display the grey scale of some high, above mentioned levels up to 256 or 1024. But because the human eye sensitivity to the brightness is limited, and cannot fully identify the grey scale. That is to say, may be a lot of adjacent levels of gray scale, the human eye seems to be the same. And eyes resolution per each are not identical. For display, the level of human recognition nature is the more the better, because the display image is, after all, give a person look. The brightness of the human eye can distinguish level, the more means that the display of color space, the greater the show colorful potential. Brightness identify class can use special software to test, general display can reach more than 20 level even better grades.
  Gray nonlinear transformation
  Gray nonlinear transformation refers to the gray level data according to the empirical data or some kind of arithmetic of nonlinear relationship between transformation and then provided to the LED display. Since the LED is a linear device, and the traditional nonlinear display different characteristics. In order to be able to make the LED display can conform to the traditional data sources without loss of gray level, general level after the LED display system can do gray level data of nonlinear transform, transform the data bits can increase after (guarantee without losing data value).
  Now some domestic control system supplier so-called gray level 4096 or 16384 grey level or higher are gray space size after a nonlinear transform. 4096 level is adopted eight source to 12 nonlinear transformation technology of the space, class of 16384 is using nonlinear transformation technology of 8 bit to 16 bit. By the eight source for nonlinear transformation, the transformed space certainly bigger than eight source. Generally at least 10. Like gray, this parameter is not the bigger the better, usually 12 can do enough transformation.
  Believe that through the relevant information, to grayscale and brightness of the LED display can have a deeper cognition.

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