We often hear that what is the gray scale and brightness of the led display, so how much do you know about the gray scale and brightness of the led display? Let's take a look at the explanation given by professionals.
The gray level of the LED display is also called the color scale or gray scale, which refers to the brightness of the brightness. For digital display technology, grayscale is the determining factor for the number of colors displayed. Generally speaking, the higher the gray level, the richer the colors displayed on the display screen, the finer the picture, the easier it is to express rich details.
The gray scale of the led display mainly depends on the A / D conversion digits of the system. Of course, the video processing chip, memory and transmission system of the system must provide the corresponding number of bits of support. At present, domestic LED display mainly uses 8-bit processing system, that is, 256 (28) gray scale. A simple understanding is that there are 256 brightness changes from black to white. The three primary colors of RGB can be used to form 256 × 256 × 256 = 16777216 colors. That is commonly called 16 trillion colors. The international brand display mainly uses a 10-bit processing system, that is, 1024-level grayscale, RGB three primary colors can constitute 1.07 billion colors.
Although grayscale is the deciding factor in determining the number of colors, it does not mean that the greater the unlimited, the better. Because the resolution of the human eye is limited first, and the increase in the number of processing bits in the system will involve changes in various aspects of the system's video processing, storage, transmission, scanning, etc., the cost will increase sharply, and the cost performance will decline. Generally speaking, civil or commercial grade products can adopt 8-bit system, and broadcast grade products can adopt 10-bit system.
Brightness discrimination level
The brightness discrimination level refers to the brightness level of the image that can be distinguished by the human eye from the darkest to the whitest. As mentioned earlier, the gray scale of the display is very high, which can reach 256 levels or even 1024 levels. However, due to the limited sensitivity of the human eye to brightness, these gray levels cannot be fully recognized. In other words, many gray levels of adjacent levels may look the same to the human eye. And the ability to distinguish eyes varies from person to person. For the display screen, the level of human eye recognition is naturally the more the better, because the displayed image is for humans after all. The more brightness levels the human eye can distinguish, the greater the color space of the display and the greater the potential for displaying rich colors. The brightness discrimination level can be tested with special software. Generally, the display screen can reach more than 20 levels, even if it is a relatively good level.
Non-linear grayscale transformation
Non-linear gray-scale transformation refers to transforming gray-scale data according to empirical data or some kind of arithmetic nonlinear relationship and then providing it to the display screen for display. Since LEDs are linear devices, they have different nonlinear display characteristics from traditional displays. In order to make the LED display effect conform to the traditional data source without losing the gray level, generally the non-linear transformation of the gray data will be done in the latter stage of the LED display system, and the number of digits after the conversion will increase (guarantee that the gray will not be lost data).
Now the so-called 4096-level grayscale or 16384-level grayscale or higher of some domestic control system suppliers refers to the grayscale space size after nonlinear transformation. Level 4096 is a non-linear transformation technique using 8-bit source to 12-bit space, and level 16384 is a non-linear transformation technique using 8-bit to 16-bit. The non-linear transformation is done by the 8-bit source, and the space after conversion is definitely larger than that of the 8-bit source. Generally at least 10 people. As with grayscale, this parameter is not as large as possible. Generally, 12 bits can be used for sufficient conversion.
So for the size of gray scale and brightness, not the bigger the better, but according to customer needs, the appropriate gray scale and brightness size will get unexpected results.
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