First, gray
Grayscale, also known as gradation or grayscale, refers to the degree of brightness of the brightness. For digital display technology, grayscale is the determining factor in the number of colors displayed. In general, the higher the gray level, the richer the displayed color, the finer the picture, and the more detailed the details.
The gray level depends mainly on the number of A/D conversion bits of the system. Of course, the system's video processing chip, memory and transmission system must provide support for the corresponding number of bits. At present, the domestic LED display mainly adopts an 8-bit processing system, that is, 256 (28)-level gray scale. A simple understanding is that there are 256 brightness variations from black to white. RGB × 256 × 256 = 16,777,216 colors can be formed by using RGB three primary colors. That is, the so-called 16 mega color. The international brand display mainly adopts a 10-bit processing system, that is, 1024-level gray scale, and RGB three primary colors can constitute 1.07 billion colors.
Although grayscale is the determining factor determining the number of colors, it does not mean that the larger the limit, the better. Because the resolution of the human eye is limited first, the increase in the number of bits processed by the system will involve changes in the system video processing, storage, transmission, scanning, etc., and the cost will increase sharply, and the cost performance will decrease. In general, 8-bit systems can be used for civilian or commercial-grade products, and 10-bit systems can be used for broadcast-grade products.
Second, the gray scale nonlinear transformation
Gray-scale nonlinear transformation refers to transforming grayscale data into empirical display data or some arithmetic nonlinear relationship and providing it to the display screen. Since LEDs are linear devices, they have different nonlinear display characteristics from conventional displays. In order to enable the LED display effect to conform to the traditional data source without losing the gray level, generally the nonlinear transformation of the gray scale data will be performed in the latter stage of the LED display system, and the number of data bits after the conversion will increase (guarantee not to lose the gray scale) data). Nowadays, some domestic control system suppliers call 4096 gray scale or 16384 gray scale or higher, which refers to the gray space size after nonlinear transformation. The 4096 stage is a nonlinear conversion technique using 8-bit to 12-bit space, and the 16384-level is a nonlinear conversion technique using 8-bit to 16-bit. The nonlinear transformation is performed by an 8-bit source, and the converted space is certainly larger than the 8-bit source. Usually at least 10 people. As with grayscale, this parameter is not as large as possible. Generally, 12 bits can be used to make enough transformations.
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