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Several key technologies of LED large screen display
by：Demo
2021-07-07
With the extensive development of various media propaganda in recent years, more and more information display screens are exposed in public places. How to choose a suitable large-screen LED display requires understanding and consideration of the following key technologies.
1. Image acquisition technology
The principle of displaying images on LED electronic display screens is mainly to convert digital signals into image signals and present them through the light-emitting system. The traditional method is to use a video capture card combined with a VGA card to realize the display function. The function of the video capture card is mainly to capture video images, and obtain the index address of the line frequency, field frequency, and pixel point with the help of VGA. The way to obtain the digital signal is mainly by copying the color look-up table. Generally, software can be used for real-time replication or hardware stealing, which is more efficient than hardware stealing. However, the traditional method has compatibility problems with VGA, and this leads to undesirable situations such as blurred edges and poor image quality, which ultimately results in damage to the image quality of the electronic display.
2. Real image color reproduction
The principle of visual performance of full-color LED electronic display is similar to that of TV. The effective combination of red, green and blue can achieve different color reproduction of images. The purity of the three colors of red, green and blue will directly affect the color reproduction of the image. It should be noted that the reproduction of the image is not a random combination of the three colors of red, green and blue, and certain prerequisites are required. First, the light intensity ratio of the three colors of red, green and blue should be close to 3:6:1; second, people are visually sensitive to red compared to the other two colors, so red needs to be evenly distributed in the display space ; Thirdly, because people’s vision responds to the different nonlinear curves of the red, green, and blue light intensities, it is necessary to correct the LED Light module emitted from the inside of the TV with the white LED Light module of different light intensities. Fourth, different people have different color resolution capabilities in different situations, so it is necessary to find out objective indicators of color reproduction. The wavelengths of the three primary colors of red, green and blue: 660nm, 525nm, and 470nm; it is better to use a 4-tube unit with white light (more It is also possible for 4 tubes, mainly depending on the LED Light module intensity); the three primary colors have 256 gray levels; the LED pixels must be processed by non-linear correction. The red, green and blue light distribution control system can be realized by a hardware system, or it can be realized with corresponding playback system software. LED display manufacturers
3. Dedicated realistic drive circuit
The main types of current pixel tube methods are: (1) Scanning drive; (2) DC drive; (3) Constant current source drive. For screens with different needs, the scanning methods used are different. For the indoor dot matrix block screen, the scanning method is mainly adopted. For the outdoor pixel tube screen, in order to ensure the stability and definition of the image, a DC drive method must be adopted to add a constant current to the scanning device.
4. Brightness control D/T conversion technology
LED electronic display screens are composed of many independent pixels through permutation and combination. Based on the feature of mutual separation between pixels, LED electronic display screen light-emitting control driving methods can only be developed in the form of digital signals. When the pixel point emits light, its light-emitting state is mainly controlled by the controller, and independent driving is realized. When the video needs to be presented in a color mode, it means that the brightness and color of each pixel need to be effectively controlled, and it is required to complete the scanning operation synchronously within a specified time. Some large-scale LED electronic display screens are composed of tens of thousands of pixels, and their complexity is greatly increased in the process of color control, so higher requirements are placed on data transmission. In the actual control process, it is unrealistic to set D/A for each pixel. Therefore, it is necessary to find a solution that can effectively control the complex pixel system.
5. Data reconstruction and storage technology
There are two main ways to organize the memory bank. One is the combined pixel method, that is, all the pixels on the screen are stored in a single memory bank, and the other is the bit plane method, that is, all the pixels on the screen are Stored in different memory banks. The direct effect of multiple uses of storage is to be able to read multiple pixel information at one time, see the two organization methods. The bit plane method of the above two storage structures has more advantages, and the effect is better when improving the display effect of the LED screen. Through the data reconstruction circuit to realize the conversion of RGB data, the same weight bits with different pixels are organically combined and placed in an adjacent storage structure. LED large screen
6. ISP technology in logic circuit design
The control circuit of traditional LED electronic display screen is mainly designed by conventional digital circuit, and its control generally adopts digital circuit combination method. In traditional technology, after the circuit design part is completed, the circuit board manufacturing process is first performed, and the relevant components are installed and the effect is debugged after the manufacturing is completed. When the logic function of the circuit board cannot meet the actual demand, it needs to be remade until it meets the use effect. It can be seen that the traditional design method not only has a certain degree of contingency in effect, but also has a long design cycle, which affects the effective deployment of various processes. When a component fails, it is difficult to maintain and costly.
Given the important role played by in ensuring proper functioning of led pcb module, every individual must take an interest towards improving led light engine module.
To reduce your production costs, get your and led light engine from Demo Photoelectric Technology (Wuxi) Co., Ltd.,you will get high quality warranty at favorable price in return. Visit Demo Led Module.
According to the latest social survey, more than 50 percent of consumers (across all age demographics) follow a brand before purchasing a product. Therefore, Demo's content can make or break a customer's decision to conduct business with you.
1. Image acquisition technology
The principle of displaying images on LED electronic display screens is mainly to convert digital signals into image signals and present them through the light-emitting system. The traditional method is to use a video capture card combined with a VGA card to realize the display function. The function of the video capture card is mainly to capture video images, and obtain the index address of the line frequency, field frequency, and pixel point with the help of VGA. The way to obtain the digital signal is mainly by copying the color look-up table. Generally, software can be used for real-time replication or hardware stealing, which is more efficient than hardware stealing. However, the traditional method has compatibility problems with VGA, and this leads to undesirable situations such as blurred edges and poor image quality, which ultimately results in damage to the image quality of the electronic display.
2. Real image color reproduction
The principle of visual performance of full-color LED electronic display is similar to that of TV. The effective combination of red, green and blue can achieve different color reproduction of images. The purity of the three colors of red, green and blue will directly affect the color reproduction of the image. It should be noted that the reproduction of the image is not a random combination of the three colors of red, green and blue, and certain prerequisites are required. First, the light intensity ratio of the three colors of red, green and blue should be close to 3:6:1; second, people are visually sensitive to red compared to the other two colors, so red needs to be evenly distributed in the display space ; Thirdly, because people’s vision responds to the different nonlinear curves of the red, green, and blue light intensities, it is necessary to correct the LED Light module emitted from the inside of the TV with the white LED Light module of different light intensities. Fourth, different people have different color resolution capabilities in different situations, so it is necessary to find out objective indicators of color reproduction. The wavelengths of the three primary colors of red, green and blue: 660nm, 525nm, and 470nm; it is better to use a 4-tube unit with white light (more It is also possible for 4 tubes, mainly depending on the LED Light module intensity); the three primary colors have 256 gray levels; the LED pixels must be processed by non-linear correction. The red, green and blue light distribution control system can be realized by a hardware system, or it can be realized with corresponding playback system software. LED display manufacturers
3. Dedicated realistic drive circuit
The main types of current pixel tube methods are: (1) Scanning drive; (2) DC drive; (3) Constant current source drive. For screens with different needs, the scanning methods used are different. For the indoor dot matrix block screen, the scanning method is mainly adopted. For the outdoor pixel tube screen, in order to ensure the stability and definition of the image, a DC drive method must be adopted to add a constant current to the scanning device.
4. Brightness control D/T conversion technology
LED electronic display screens are composed of many independent pixels through permutation and combination. Based on the feature of mutual separation between pixels, LED electronic display screen light-emitting control driving methods can only be developed in the form of digital signals. When the pixel point emits light, its light-emitting state is mainly controlled by the controller, and independent driving is realized. When the video needs to be presented in a color mode, it means that the brightness and color of each pixel need to be effectively controlled, and it is required to complete the scanning operation synchronously within a specified time. Some large-scale LED electronic display screens are composed of tens of thousands of pixels, and their complexity is greatly increased in the process of color control, so higher requirements are placed on data transmission. In the actual control process, it is unrealistic to set D/A for each pixel. Therefore, it is necessary to find a solution that can effectively control the complex pixel system.
5. Data reconstruction and storage technology
There are two main ways to organize the memory bank. One is the combined pixel method, that is, all the pixels on the screen are stored in a single memory bank, and the other is the bit plane method, that is, all the pixels on the screen are Stored in different memory banks. The direct effect of multiple uses of storage is to be able to read multiple pixel information at one time, see the two organization methods. The bit plane method of the above two storage structures has more advantages, and the effect is better when improving the display effect of the LED screen. Through the data reconstruction circuit to realize the conversion of RGB data, the same weight bits with different pixels are organically combined and placed in an adjacent storage structure. LED large screen
6. ISP technology in logic circuit design
The control circuit of traditional LED electronic display screen is mainly designed by conventional digital circuit, and its control generally adopts digital circuit combination method. In traditional technology, after the circuit design part is completed, the circuit board manufacturing process is first performed, and the relevant components are installed and the effect is debugged after the manufacturing is completed. When the logic function of the circuit board cannot meet the actual demand, it needs to be remade until it meets the use effect. It can be seen that the traditional design method not only has a certain degree of contingency in effect, but also has a long design cycle, which affects the effective deployment of various processes. When a component fails, it is difficult to maintain and costly.
Given the important role played by in ensuring proper functioning of led pcb module, every individual must take an interest towards improving led light engine module.
To reduce your production costs, get your and led light engine from Demo Photoelectric Technology (Wuxi) Co., Ltd.,you will get high quality warranty at favorable price in return. Visit Demo Led Module.
According to the latest social survey, more than 50 percent of consumers (across all age demographics) follow a brand before purchasing a product. Therefore, Demo's content can make or break a customer's decision to conduct business with you.
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