brief introduction:
Have you seen such a group display system? The control unit of all the display screens in the system can be connected to the Internet. Each screen is given a web address. The playback content and playback time of the display screen are edited and controlled by the central control room. Of course, each display screen can also display the same or Different content - This is the "Network Group Display System" based on LED display developed and launched by BOE Technology Group in cooperation with Visonscape in the United States. (The performance parameters of BOE outdoor display are listed in the attached table). It is reported that this new type of LED display has been first set up in Beijing Wangfujing Commercial Street, which has played a significant role in video playback and commercial information display.
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According to Tang Guohua, chief engineer of Shenzhen BOE Intelligent Display Technology Co., Ltd., who is responsible for the research and development of the LED display, real-time playback of the group display system has been a problem due to the limitation of network data transmission rate, but the BOE system is adopted. The problem of small aperture transmission technology, VSAT (Very Small Aperture Transmission), has been solved. The system's uplink data transmission rate can reach 192Kbps, and the downlink data transmission rate can reach 1.544Mbps (the antenna used is a dish antenna with a diameter of 1 meter). On the other hand, because the system also uses Sony's CXA3281N drive technology, the display has a "three high" (that is, high gray, high density, high refresh frequency) characteristics: the gray level of the conventional display is generally It is 256 grades, and the BOE display is 4096 grades; the dot density of domestic outdoor full color screen is generally 2500 points/square meter, the BOE display is 3906 points/square meter; the display refresh rate is generally 60Hz, the BOE display is 100Hz.
In addition to the above characteristics, this new LED group display system has the following features in terms of technical application and functional design:
Grayscale control technology
Generally, the gray scale of the display screen is 256 levels, and the gray scale of the BOE display can be decomposed from 4096 levels to 256 levels, so as to be closer to the human visual experience.
Nonlinear correction technique
This is a technique for correcting the brightness of the LED display screen according to the sensitivity of the human eye to the brightness level difference. The application of this technology requires a large amount of experimental data based on the advanced instrument adopted by Sony, and has been established through a large number of experiments. A mature corrective data model is used, and the BOE display is used in the design.
Gamma correction technology
In order to make the gray level of the display screen rich in order to conform to the visual characteristics of the human eye, the BOE display has undergone Gamma correction on the screen control as in the general display screen, and the second Gamma correction is performed in the drive part through the CXA3281N.
Chromatic coordinate space transformation technique
Since the video source and the light-emitting diode have different chromaticity spaces, the video display of the LED is often not real enough in color. In order to overcome this shortcoming, BOE display uses proprietary technology to transform the chromaticity coordinates of the video source and the LED, thus achieving good color reproduction.
Motion compensation technology
When displaying an object moving at a high speed, if the data processing speed is too slow, a large screen afterglow will be generated, causing a "tailing" phenomenon. In order to avoid this phenomenon, BOE display also uses a high-speed A/D chip, and also added a motion compensation circuit to make the dynamic picture more stable and clear.
Brightness adjustment technique
Outdoor displays should have different display brightness during day and night use, otherwise there may be dim days and dazzling nights. The BOE display can adjust the brightness by 256 levels by using the CXA3281N chip, so that the brightness can be matched with different ambient light at any time.
Energy saving and environmental protection technology
Since the static constant current is used to drive the light-emitting diode, the gray scale is controlled by pulse width modulation (PWM), so that the luminous efficiency of the light-emitting diode is improved, and the energy-saving effect is obvious. In addition, the application of brightness adjustment technology can also play a role in energy saving. BOE display also fully considers the suppression of noise in structural design and material selection, and minimizes the noise generated by the exhaust cooling system.
Display self-test function
Generally, the fault point of the LED display is difficult to detect accurately, and it is often necessary to manually find the row and column where the fault point is located. The BOE display uses the CXA3281N chip, so when the screen fails, the control unit can indicate the location of the faulty unit. In addition, if the operating temperature is too high, the CXA3281N chip can also output an alarm signal (the LED display does not have this function).
Display automatic management program
There are generally strict regulations and procedures for the operation of LED displays. In order to reduce the equipment damage caused by human error, BOE display adopts programmable controller (PLC) to realize the automatic management of the display screen, making the LED display become a "fool-type" device.
Internet function
Not only can it get data from the LAN, but it can also get resources from the WAN, and even access the company's website to download the latest control software and get remote services.
Process control
The display effect depends to a large extent on the selection and assembly of the LEDs - both high-quality LED devices and sophisticated processes for manufacturing display modules. The display module of BOE display uses a unique positioning technology to ensure the accuracy of the LED embedding position and angle. The screen color difference caused by the improper process will be reduced to the highest level. In addition, the special PR-650 is used in the assembly. The spectrometer tests the screen to optimize the LED configuration.
Power intelligent management system
In order to facilitate the user's use, and to prevent the impact on the power grid when the display starts, the BOE display is also equipped with a “power intelligent management systemâ€, which can be used to perform power operation through wireless remote control and remote control. The screen's timing start, timing off and other functions. After adopting the system, the screen body can also adopt a step-by-step power-on startup mode when the power is connected to the power supply, which greatly improves the working conditions of the electrical components and prolongs the service life of the components.
Environmentally adaptive design
In order to adapt this new display to the complex and varied working environment in the outdoor, BOE has also made considerable efforts in the environmental adaptability design of the display, which makes the product have strong moisture, dust and defense. High temperature, anti-static, anti-freeze, anti-corrosion, fire prevention and electrical overload protection.
Nowadays, this LED "Network Group Display System" is making a name for itself on Wangfujing Commercial Street in China's first street. I believe that as this type of display system is more and more widely recognized by users, we will also have more and more. It is seen in the public information display places such as the street and the station.
Have you seen such a group display system? The control unit of all the display screens in the system can be connected to the Internet. Each screen is given a web address. The playback content and playback time of the display screen are edited and controlled by the central control room. Of course, each display screen can also display the same or Different content - This is the "Network Group Display System" based on LED display developed and launched by BOE Technology Group in cooperation with Visonscape in the United States. (The performance parameters of BOE outdoor display are listed in the attached table). It is reported that this new type of LED display has been first set up in Beijing Wangfujing Commercial Street, which has played a significant role in video playback and commercial information display.
According to Tang Guohua, chief engineer of Shenzhen BOE Intelligent Display Technology Co., Ltd., who is responsible for the research and development of the LED display, real-time playback of the group display system has been a problem due to the limitation of network data transmission rate, but the BOE system is adopted. The problem of small aperture transmission technology, VSAT (Very Small Aperture Transmission), has been solved. The system's uplink data transmission rate can reach 192Kbps, and the downlink data transmission rate can reach 1.544Mbps (the antenna used is a dish antenna with a diameter of 1 meter). On the other hand, because the system also uses Sony's CXA3281N drive technology, the display has a "three high" (that is, high gray, high density, high refresh frequency) characteristics: the gray level of the conventional display is generally It is 256 grades, and the BOE display is 4096 grades; the dot density of domestic outdoor full color screen is generally 2500 points/square meter, the BOE display is 3906 points/square meter; the display refresh rate is generally 60Hz, the BOE display is 100Hz.
In addition to the above characteristics, this new LED group display system has the following features in terms of technical application and functional design:
Grayscale control technology
Generally, the gray scale of the display screen is 256 levels, and the gray scale of the BOE display can be decomposed from 4096 levels to 256 levels, so as to be closer to the human visual experience.
Nonlinear correction technique
This is a technique for correcting the brightness of the LED display screen according to the sensitivity of the human eye to the brightness level difference. The application of this technology requires a large amount of experimental data based on the advanced instrument adopted by Sony, and has been established through a large number of experiments. A mature corrective data model is used, and the BOE display is used in the design.
Gamma correction technology
In order to make the gray level of the display screen rich in order to conform to the visual characteristics of the human eye, the BOE display has undergone Gamma correction on the screen control as in the general display screen, and the second Gamma correction is performed in the drive part through the CXA3281N.
Chromatic coordinate space transformation technique
Since the video source and the light-emitting diode have different chromaticity spaces, the video display of the LED is often not real enough in color. In order to overcome this shortcoming, BOE display uses proprietary technology to transform the chromaticity coordinates of the video source and the LED, thus achieving good color reproduction.
Motion compensation technology
When displaying an object moving at a high speed, if the data processing speed is too slow, a large screen afterglow will be generated, causing a "tailing" phenomenon. In order to avoid this phenomenon, BOE display also uses a high-speed A/D chip, and also added a motion compensation circuit to make the dynamic picture more stable and clear.
Brightness adjustment technique
Outdoor displays should have different display brightness during day and night use, otherwise there may be dim days and dazzling nights. The BOE display can adjust the brightness by 256 levels by using the CXA3281N chip, so that the brightness can be matched with different ambient light at any time.
Energy saving and environmental protection technology
Since the static constant current is used to drive the light-emitting diode, the gray scale is controlled by pulse width modulation (PWM), so that the luminous efficiency of the light-emitting diode is improved, and the energy-saving effect is obvious. In addition, the application of brightness adjustment technology can also play a role in energy saving. BOE display also fully considers the suppression of noise in structural design and material selection, and minimizes the noise generated by the exhaust cooling system.
Display self-test function
Generally, the fault point of the LED display is difficult to detect accurately, and it is often necessary to manually find the row and column where the fault point is located. The BOE display uses the CXA3281N chip, so when the screen fails, the control unit can indicate the location of the faulty unit. In addition, if the operating temperature is too high, the CXA3281N chip can also output an alarm signal (the LED display does not have this function).
Display automatic management program
There are generally strict regulations and procedures for the operation of LED displays. In order to reduce the equipment damage caused by human error, BOE display adopts programmable controller (PLC) to realize the automatic management of the display screen, making the LED display become a "fool-type" device.
Internet function
Not only can it get data from the LAN, but it can also get resources from the WAN, and even access the company's website to download the latest control software and get remote services.
Process control
The display effect depends to a large extent on the selection and assembly of the LEDs - both high-quality LED devices and sophisticated processes for manufacturing display modules. The display module of BOE display uses a unique positioning technology to ensure the accuracy of the LED embedding position and angle. The screen color difference caused by the improper process will be reduced to the highest level. In addition, the special PR-650 is used in the assembly. The spectrometer tests the screen to optimize the LED configuration.
Power intelligent management system
In order to facilitate the user's use, and to prevent the impact on the power grid when the display starts, the BOE display is also equipped with a “power intelligent management systemâ€, which can be used to perform power operation through wireless remote control and remote control. The screen's timing start, timing off and other functions. After adopting the system, the screen body can also adopt a step-by-step power-on startup mode when the power is connected to the power supply, which greatly improves the working conditions of the electrical components and prolongs the service life of the components.
Environmentally adaptive design
In order to adapt this new display to the complex and varied working environment in the outdoor, BOE has also made considerable efforts in the environmental adaptability design of the display, which makes the product have strong moisture, dust and defense. High temperature, anti-static, anti-freeze, anti-corrosion, fire prevention and electrical overload protection.
Nowadays, this LED "Network Group Display System" is making a name for itself on Wangfujing Commercial Street in China's first street. I believe that as this type of display system is more and more widely recognized by users, we will also have more and more. It is seen in the public information display places such as the street and the station.
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