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LED display gray knowledge introduction
- Jan 05, 2018 -

First, Grayscale


Grayscale is the so-called tone or grayscale, refers to the brightness of the brightness level. For digital display technology, grayscale is the decisive factor in the number of colors displayed. In general, the higher the grayscale, the richer the colors are, the more delicate the picture is and the more detail it is.


Grayscale depends mainly on the system A / D conversion bits. Of course, the system's video processing chip, memory and transmission systems have to provide the appropriate number of bits to support it. At present, the main domestic LED display with 8-bit processing system, which is 256 (28) gray level. Simple to understand is from black to white a total of 256 kinds of brightness changes. Using RGB three primary colors to form 256 × 256 × 256 = 16777216 kinds of colors. That is commonly referred to as 16 megabytes. International brand display mainly uses 10 processing system, that is 1024 gray scale, RGB three primary colors can form 1.07 billion colors.


Although the gray scale is the decisive factor in determining the number of colors, it does not mean that the bigger the better, the better. Because first of all, the resolution of the human eye is limited, and the increase of system processing bits will involve changes of system video processing, storage, transmission, scanning and other aspects, the cost increases sharply, and the cost performance will drop instead. In general, commercial or commercial products can use 8-bit systems, broadcast-quality products can use 10-bit systems.


Second, gray-scale nonlinear transformation


Gray-scale non-linear transformation refers to the grayscale data in accordance with empirical data or some kind of mathematical non-linear relationship between the transformation and then provided to the display screen. As led is a linear device, with the traditional display of nonlinear display characteristics are different. In order to make the LED display to meet the traditional data sources without losing the gray level, the general level of the LED display system will do non-linear transformation of gray data, the converted data bits will increase (to ensure that no loss of gray data). Now some of the control system suppliers so-called 4096 gray scale or 16384 gray scale or more refers to the non-linear transformation of the gray space size. 4096 is a non-linear conversion technology using 8-bit source to 12-bit space, and 16384 is a non-linear conversion technology using 8 to 16 bits. Made by the 8-bit source of non-linear transformation, converted space certainly larger than the 8-bit source. Generally at least 10. As with grayscale, this parameter is not the bigger the better, generally 12 can do enough transformation.


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