How to distinguish the gray scale and brightness of LED display

Core tip: We often hear what the gray scale and brightness of the LED display are, so how much do you know about the gray scale and brightness of the LED display? The following editors have compiled and compiled the explanations given by professionals to give you a comprehensive analysis of the grayscale of LED displays. We often hear that the grayscale and brightness of LED displays are. How much do you know about gray scale and brightness? The following editors compile the explanations given by professionals, and give you a comprehensive analysis of the gray scale and brightness of the LED display.

What is the gray scale of LED display? What are the gray levels of LED display?

The gray scale 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, LED display is mainly used

The following four processing systems have formed four different gray levels:

1. An 8-bit processing system, that is, 256 (2 to the 8th power) gray scale. A simple understanding is that there are 256 brightness changes from black to white.

Second, 10-bit processing system, which is 1024 (2 to the 10th power) grayscale. A simple understanding is that there are 1024 brightness changes from black to white.

Three, 12-bit processing system, that is 4096 (2 to the 12th power) gray scale. A simple understanding is that there are 4096 brightness changes from black to white.

Four, 14-bit processing system, that is, 16384 (2 to the 14th power) grayscale. A simple understanding is that there are 16384 brightness changes from black to white.

Grayscale is the determinant of the left and right colors. The increase in the number of processing bits of the system will involve changes in various links such as system video processing, storage, transmission, and scanning. Generally speaking, monitors for private use can use 8-bit or 10-bit systems, and commercial or broadcast-grade products can use 12-bit systems or even higher-level systems. 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.

How to identify the brightness level of LED display?

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.

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.

What brightness requirements does the ambient brightness have for the screen?

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 to south):> 8000CD / M2

What are the brightness requirements for red, green and blue in terms of white composition?

Red, green, and blue contribute differently to the white color. The root cause is that the retina of the human eye feels differently for different wavelengths of light. After a large number of experimental tests, the following approximate ratios are obtained for reference design:

The simple red, green and blue brightness ratio is 3: 6: 1

The precise 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 interrelated and have their own differences. Both grayscale and brightness are not as large as possible. With the application and development of LED display, each of us should know some related knowledge about LED display. Do you understand the gray scale and brightness of LED display?

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