What is the grayscale of the LED display? What are the levels of LED display grayscale?
The gray scale of the LED display is also called the gradation or gray scale, which refers to the 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 color displayed on the display screen, and the more delicate the picture, the easier it is to express rich details.
The gray level of the LED display 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. Currently LED display is mainly used
The following four processing systems form four different gray levels:
One, 8-bit processing system, which is 256 (2 8 power) level gray. A simple understanding is that there are 256 brightness variations from black to white.
Second, the 10-bit processing system, that is, 1024 (2 10th power) level gray. A simple understanding is that there are 1024 brightness changes from black to white.
Third, 12-bit processing system, that is, 4096 (2 12-th power) gray scale. A simple understanding is that there are 4096 brightness changes from black to white.
Fourteen, 14-bit processing system, that is, 16384 (2 14th power) gray scale. A simple understanding is that there are a total of 16384 brightness changes from black to white.
Gray scale is the decisive factor of left and right color. The increase of system processing digits will involve changes in system video processing, storage, transmission, scanning and other aspects. Generally, the display used for private use can be an 8-bit or 10-bit system, and the commercial or broadcast-grade product can adopt a system of 12-bit system or higher. 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.
How to identify the brightness level of LED display?
The brightness discrimination level refers to the brightness level between the blackest and the whitest images that the human eye can distinguish. As mentioned earlier, the gray level of the display is very high, which can reach 256 or even 1024. However, since the human eye has limited sensitivity to brightness, these gray levels cannot be fully recognized. That is to say, many grayscale human eyes of adjacent levels may look the same. And the ability to distinguish the eyes is different for each person. For the display, the level of human eye recognition is naturally as good as possible, because the displayed image is for everyone to see. 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 can reach 20 or higher, even if it is a good level.
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.
What are the brightness requirements for the screen brightness?
The general brightness requirements are as follows:
(1) Indoor: >800CD/M2
(2) Semi-indoor: >2000CD/M2
(3) Outdoor (sitting south to north): >4000CD/M2
(4)Outdoor (sitting north facing south):>8000CD/M2
What kind of brightness requirements do red, green and blue have in terms of white composition?
Red, green, and blue contribute differently in terms of white color. The root cause is that the retina of the human eye is different for different wavelengths of light. After a large number of experimental tests, the following approximate ratios are obtained for reference design:
The ratio of simple red, green and blue is: 3:6:1
The exact red, green and blue brightness ratio is: 3.0:5.9:1.1
In summary, it is not difficult to see that the grayscale and brightness of the LED display are related to each other and have their own differences. The grayscale and brightness are not the larger the better. With the application and development of LED display, each of us should know some knowledge about LED display. Do you understand the grayscale and brightness of LED display?
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