The production and installation technology of LED display has a great influence on the quality of the display. From the selection of production materials to processing to finished products, every link needs to be strictly checked and refined to every step. In addition, the LED display should be regularly inspected and maintained during the use of the LED display, and remedial measures should be taken in time if quality problems are found.

Nowadays, the application range of LED display screens is constantly expanding, and the number of LED display screen components is also increasing. The quality of LED display screen components has a great impact on the quality of LED display screens. However, the quality of many LED display components varies, which is mainly reflected in the following points: First, the new LED display components are still in the trial stage, and the quality cannot be guaranteed. Second, the professional level and comprehensive quality of the LED display component production personnel are not high. , greater fluidity, and third, the quality of the original LED display components is poor, unable to meet the production and use requirements of LED displays.

Static problem analysis

In the process of LED display production and installation, static electricity has a great impact on the quality of LED display. However, many LED display production and installation companies only know

The importance of static control in the welding of LED display screens, and the lack of understanding of the importance of static control in other links. In the northern region, the climate is cold and dry in winter, and the voltage of static electricity is very high. Static electricity will destroy the LED display circuit, resulting in circuit damage, and the performance and service life of the LED display will be affected to varying degrees. Therefore, in the process of LED display production and installation, we must pay attention to anti-static control to avoid damage to the LED display.

Analysis of Welding Link Control Problems

There will also be many quality problems in the process of LED display welding, which are mainly reflected in the following points: first, the enterprise's static electricity prevention and control management is not in place, second, the temperature and air humidity of the LED display application are unreasonable, and third, the LED display The welding time of the display components is not well controlled. Fourth, there are quality problems in the welding materials. Fifth, the welding personnel do not have the skills

Professional welding technology, low professional level. Many welding companies do not have professional welding personnel, and the mobility of personnel is relatively large, resulting in a lack of technical support for LED display welding. After the LED display is used for a period of time, the brightness of the display will become lower. The reason for this phenomenon is that the welding personnel did not reasonably control the welding time and temperature, resulting in fog in the Soft LED Curtain Screen display, which in turn affects the brightness of the display. Therefore, in order to ensure the quality of LED display screens and reasonably control welding problems, welding companies must strengthen personnel training and continuously improve the professional level and comprehensive quality of welding personnel. In addition, welding companies can set up a reward mechanism within welding personnel to give certain material rewards or spiritual rewards to employees with outstanding performance, so as to improve the enthusiasm and enthusiasm of welding personnel.

Analysis of LED Display Aging Problems

Under normal circumstances, the LED display should be placed for 72 hours before going out, and this 72 hours is the aging time of the LED display. However, from the actual situation, many LED display manufacturers do not perform aging treatment on the display, so that it is impossible to find the quality problems of the LED display and take countermeasures for the quality problems. In fact, many quality problems of LED display screens need to be discovered during the use of LED display screens. Many LED display screens need to be repaired many times. The main reason is that the LED display screens have not been aged before they are released. If the LED display is not aged, it will not only affect the quality of the LED display, but also increase the repair and maintenance cost of the LED display, thereby reducing the economic benefits of the application enterprise.

Problem analysis of LED display mask

Usually, indoor LED displays are all LED lights. People will find that many LED displays have better visual effects when viewed from the outside, but the visual effects are not very ideal when viewed from the side, and mosaic phenomena will appear to varying degrees, affecting the LED display. The brightness of the display screen, the cause of this problem is the quality problem of the LED display screen mask. The function of the LED display mask is reflected in the following aspects: one is to protect the LED display, the other is to increase the brightness of the LED display, enhance the color of the background color, and make the LED display and the background color form a sharp contrast. If there is a problem with the quality of the LED display mask or the installation method is incorrect, not only will it not protect the LED display, but it will damage the LED display, affecting the performance and service life of the LED display. The unqualified LED display mask is reflected in the following points: first, the material of the LED display mask is not good; second, there are impurities on the surface of the LED display mask; third, the reflection of the LED display mask is strong; The number of screws is relatively small, and the stability of the LED display mask is poor. Fifth, the LED display mask and the display circuit board cannot be combined. Therefore, in order to ensure the quality of the LED display, it is necessary to ensure the quality of the LED display mask, reasonable material selection, and reasonable installation.

Display module problem analysis

The problems of the LED display module are mainly reflected in the following aspects: one is the quality problem of the module shell, and the other is that the material of the module is not good. In order to ensure the quality of the LED display, it is also necessary to ensure the quality of the LED display module, select high-quality materials, strictly control the amount of module glue used, and prevent the glue from leaking out.

Although the application range of LED display is expanding, there are still many problems in the application process of LED display. Only by solving these problems reasonably can the quality and performance of LED display be guaranteed, the service life of LED display can be extended, and the LED display can be reduced. screen repair costs. LED display quality problems can be reflected in six aspects, any link is very important. Therefore, the staff must formulate a reasonable LED display quality control plan based on the actual situation to ensure the quality of the LED display components and masks, and pay attention to the aging of the LED display when it leaves the factory. In addition, the staff should also do a good job of anti-static on the LED display, otherwise the LED display components will be affected by static electricity, which will eventually lead to damage to the LED display and increase the repair and maintenance costs of the LED display.

In response to the development of the times, mobile phones and ipads have more and more computer functions, that is, online office can be realized on mobile phones and ipads. Since the mobile phone and Ipad can realize most of the functions of the computer, it is not a problem to use the mobile phone and ipad to control the LED display. Then how do they control the LED display and what is the principle? Let the LED display manufacturers explain to you .

How does the mobile device control the led display?

In fact, one of the most important reasons for mobile phones and ipads to control LED displays is to connect these devices, so do mobile phones and ipads need network cables to connect like computers? The answer is no, just use WIFI to connect.

1. Several ways to control the led display screen with mobile phone and ipad

1.1, WIFI wireless control

The system takes the mobile terminal (mobile phone, IPAD) as the control terminal, and realizes the remote wireless control screen for the first time, and all its functions can be realized by touch screen control, and the switching in zero seconds does not freeze. Really abandon the traditional keyboard, mouse, software instead of hardware.

Working principle: By adding a wireless router or other wireless equipment, it bridges with the user's original wireless network to build a wireless local area network, and easily integrates the network control card into the wireless network for wireless network control.

Features: no wiring, easy installation and debugging, fast data transmission.

Required equipment: bridge, wireless router (it is best to choose a device with a replaceable antenna for the application on the display screen, so that the wireless signal can be received effectively).

Disadvantages: The communication distance mainly depends on the gain capability of the bridge. The communication distance of the wireless router is relatively short, and the signal of the partition wall is relatively weak or there is no signal. It is suitable for places with short-distance wireless signals. If the area where your display screen is located already has wireless signal coverage, it is even simpler, just bridge the wireless router connected to the LED display control card in the led display screen to your wireless network, and you can use the intranet Control the display from any computer.

1.2. RF wireless control

Working principle: One end of the RF module is connected to the control computer, and the other end is connected to the serial port of the control card. After the driver is installed on the computer, a virtual serial port is generated and data is sent through this serial port.

1.3, GPRS wireless control

Working principle: After the GPRS module is powered on, it completes the process of dialing up to access the Internet, and connects to the server in the data center. The customer accesses the server through the client software, and the server forwards the information.

1.4, 4G full Netcom wireless control

Working principle: basically the same as 3G/GPRS.

Features: 4G full Netcom (supported by all series of China Mobile, China Unicom, and China Telecom), fast transmission rate, fully realized real-time control, and can instantly respond to related controls when sending commands.

2. Several functions of the mobile phone and ipad to control the led display

2.1. Image preview, visual operation

Use the IPAD to control the screen, and any function can be visualized at a glance. If you can play with your mobile phone or iPad, you can control the large LED screen! Before switching, you can preview the content to be played to prevent misoperation to the greatest extent, safe and reliable!

2.2. Brightness and volume can be adjusted arbitrarily with one key

According to the actual situation on site, customers can remotely control the brightness of the screen (from the brightest to black) and the volume on the iPad at any time, which is simple and convenient. The most important thing is that any operation will not affect the use of the current screen, and there is no need to exit the current playback!

2.3, support list editing

Before or during use, customers can perform file classification, list sorting, file addition and deletion, and pre-monitoring of the broadcast programs at any time. Single loop or list loop can be set when playing video.

2.4. One-key switch between picture-in-picture, four-screen and nine-screen

Single-screen playback mode and picture-in-picture (supports up to four split screens, which can be dragged and enlarged), four-screen, nine-screen, one-click switching, zero-second delay without lag; in multi-screen mode, double-click any The screen can be switched between full screen and windowed (audio sync).

2.5, support PPT, Word and other Office files to play

The wireless control screen system supports normal playback of Office files (including PPT animations), seamless switching between Office files, and seamless switching with videos (that is, it can support large video files without freezing). A file can be placed in multiple windows, independent of each other, so as to preview the next screen and ensure safety.

2.6, can edit subtitles synchronously, support synchronous and asynchronous recording

During use, users can edit letters synchronously, record and record with one click, support synchronous recording and one recording, and the recorded files can be exported.

2.7, support multi-screen synchronization

This system can support multiple screens controlled by one device. By switching, the playback content of each display screen can be controlled separately, and multiple screens can be controlled synchronously.

2.8. Other functions

Resume playback after power failure: Even if the iPad is turned off, the screen will still play in the original mode without black screen;

External equipment: support direct signal connection of cameras, DV, DVD players, laptops and other equipment, and can simultaneously preview the live broadcast screen, and switch with one key.

3. Mobile phone and ipad combination scheme to control the led display

(Using the main control secret box + LED video processor + WIFI) The main control secret box of the combined scheme can also be replaced by a millet box. The following main control secret box is an example:

3.1 Main functions realized

Use the mobile phone (Android, Apple) system to control the LED display to play the content in the mobile phone, the content includes regular pictures, videos, etc.

3.2 Required functional equipment:

1) One Android/iOS mobile phone;

2) One master control secret box;

3) One wireless router (need to connect to the Internet);

4) A set of led display;

5) LED video processor [support HDMI or related HDMI conversion cable (the main control box is HDMI interface)];

3.3 Connections that need to be completed by the device before control and preparations for playing files:

1) First connect the LED display and LED video processor normally and complete the debugging;

2) Connect the HDMI output of the main control box to the LED video processor and make corresponding settings;

3) The wireless router turns on the wireless network, and connects the mobile phone and the main control box to the same WIFI network at the same time;

4) The mobile phone installs a corresponding version of the outdoor led screen panels main control system according to the system, and connects to the main control secret box through settings,

And back up the content that needs to be played on the LED stage screen to the mobile phone in advance;

3.4 Specific operation methods:

1) Use the main control system to directly send the video or photos in the mobile phone or the shared computer to the main control secret box by swiping up, and the main control secret box will directly play your customized video and picture files after receiving it;

2) You can also play various videos on the Internet through the master control box

1. 3+2 multi-primary color chroma processing method:

In recent years, 3+3 multi-primary color display (red, green, blue plus yellow, cyan, purple) has been enthusiastically discussed in the field of flat panel display in order to expand the color gamut and reproduce richer natural colors. So, can the LED display realize 3+3 multi-primary color display?

We know that in the range of visible light, yellow and cyan are monochromatic light, and we already have high-saturation yellow and cyan LEDs. Purple is polychromatic light, and single-chip purple LEDs do not exist. Although we can't realize red, green, blue plus yellow, cyan, purple 3+3 multi-color led display. However, it is feasible to study red, green, blue plus yellow, cyan 3+2 multi-primary LED display. Because there are a lot of high-saturation yellow and cyan in nature; therefore, this research is of certain value.

In the various current TV standards, the video source only has the three primary colors of red, green and blue, but not the two colors of yellow and cyan. Then, how to drive the yellow and cyan primary colors of the display terminal?

In fact, when determining the driving strength of the yellow and cyan primary colors; we follow the following three principles:

1. While increasing the color saturation, do not change the hue;

2. The purpose of adding the primary colors of yellow and cyan is to expand the color gamut and thus improve the color saturation. while the overall brightness value cannot be changed;

3. Take D65 as the center; take the RYGCB color gamut boundary as the endpoint, and make linear expansion at each point within the color gamut.

Under the guidance of the above three principles; according to the law of the center of gravity, we can find a 3+2 multi-primary chromaticity processing method. However, in order to truly realize the 3+2 multi-primary color full-color screen, we still need to overcome difficulties such as insufficient brightness of yellow and cyan LEDs and a large increase in cost, which are currently limited to theoretical discussions.

2. Color restoration processing:

The birth of pure blue and pure green LEDs has made full-color LED displays popular in the industry for their wide color gamut and high brightness. However, due to the large deviation between the chromaticity coordinates of red, green and blue LEDs and the red, green and blue chromaticity coordinates of PAL TV (see Table 1), the color reproduction of LED full-color screens is poor. Especially when expressing human skin color, there are obvious deviations visually. As a result, color restoration processing technology came into being. Here I recommend two color restoration methods:

1. Carry out color coordinate space transformation on the red, green and blue three-primary color LED, so that the three-primary color coordinates between the LED and the PAL TV are as close as possible, thereby greatly improving the color reproduction of the LED display. However, this method greatly reduces the color gamut range of the LED display, which greatly reduces the color saturation of the picture.

2. Properly correct only the skin color gamut that is most sensitive to the human eye; and reduce the original color saturation as little as possible for the color gamut that is not sensitive to other human eyes. In this way, a balance can be achieved between color reproduction and color saturation.

3. Selection of base color wavelength:

LED display screens are becoming more and more demanding as people's requirements for LED display screens are getting higher and higher. Only subdividing and screening LED color coordinates can no longer satisfy people's critical eyes. Getting better is achievable.

We found that even the same grade of LED of the first international brand has large wavelength deviation and color saturation deviation, and the deviation range greatly exceeds the human eye's threshold for distinguishing green color difference. Therefore, it is important to perform color uniformity correction. meaningful.

In the CIE1931 chromaticity diagram, according to the law of the center of gravity, we find that: any point within the G range (□abcd) of green mixed with a certain proportion of red and blue can adjust the color coordinates of the mixed color to the straight line cR and The intersection point O of the straight line dB.

Although the chromaticity uniformity can be greatly improved. However, there is a noticeable drop in color saturation after correction. At the same time, another prerequisite for using red and blue to correct the uniformity of green chromaticity is that the red, green and blue LEDs in the same pixel should be distributed as intensively as possible so that the color mixing distance of red, green and blue can be as close as possible to achieve better results. Effect. At present, the LED uniform distribution method usually used in the industry will bring confusion to the chromaticity uniformity correction. In addition, how to measure the color coordinates of tens of thousands of red, green and blue LEDs is also an extremely difficult problem. We gave hints about this.

4. Chromaticity uniformity treatment:

The chromaticity uniformity of LED display screens has always been a major problem for people in the industry. It is generally believed that the uneven brightness of LEDs can be corrected at a single point to improve the uniformity of brightness. The uneven chromaticity cannot be corrected, and can only be improved by subdividing and screening the LED color coordinates.

5. Adjustment of white field color coordinates:

White field color coordinate adjustment is one of the most basic technologies of full-color LED display. However, in the mid-1990s, due to the lack of industry standards and basic testing methods, the white point color coordinates were usually determined only by human eyes and feelings, resulting in serious color cast and randomness of white point color temperature. With the promulgation of industry standards and the completion of testing methods, many manufacturers have begun to standardize the color matching process of full-color screens. However, due to the lack of theoretical guidance for color matching, some manufacturers often adjust the color coordinates of hundreds of fields by sacrificing the gray level of some primary colors, and the overall performance cannot be improved.

To sum up, we mainly discussed three issues:

1. How to improve the chromaticity uniformity of the LED display;

2. How to expand the color gamut and restore more natural colors;

3. How to improve the color reproduction of the LED display;

The above-mentioned chroma processing technologies are all interrelated in actual implementation, and in some aspects, it is even impossible to have both. The integrated LED display also needs to perform brightness uniformity correction, gray scale nonlinear transformation, noise reduction processing, image enhancement processing, dynamic pixel processing, etc. The entire signal processing process is very complicated. Therefore, we must comprehensively weigh various performances from the perspective of the system, grasp the order of various processing, and increase the depth of signal processing, so that the LED full-color display can show a colorful and colorful world.

All walks of life have a very wide range of applications, and in different application places have different requirements for the primary color wavelength of LEDs. Some of the choices for the primary color wavelength of LEDs are to achieve good visual effects, some are to meet people's habits, and some It is the regulation of industry standard, national standard and even international standard.

For example, the choice of the wavelength of the primary color of the green tube in the full-color led wall screen panels display; in the early days, people generally used yellow-green LEDs with a wavelength of 570nm. Although the cost is low, the color gamut of the display is small, the color reproduction is poor, and the brightness is low. After choosing a pure green tube with a wavelength of 525nm, the color gamut of the display is nearly doubled, and the degree of color reproduction is greatly improved, which greatly improves the visual effect of the display. For another example, on the securities market display screen, people are usually used to using red to indicate a stock price rise, green to indicate a stock price decline, and yellow to indicate a flat market. In the transportation industry, the national standard strictly stipulates that the blue and green bands are allowed to pass, and the red band is forbidden. Therefore, the selection of the primary color wavelength is one of the important links of the LED display.

LED display cabinet calibration can greatly improve the display quality of the spliced display, and it is more efficient than on-site calibration, not limited by time and place, and the cost is also low. Therefore, the cabinet calibration technology will become an indispensable part of the LED display manufacturing process and has a good application prospect.

Due to the discreteness and attenuation of LED light-emitting tubes and the discreteness of circuit components, LED display screens have inconsistent brightness and chromaticity, which seriously affects the display quality. In order to overcome the problem of non-uniformity of brightness and chromaticity of LED display screen, point-by-point correction technology came into being and developed rapidly. It can significantly improve the uniformity of LED display screen and improve the display quality.

According to different application occasions, the point-by-point calibration technology can be divided into two types: one is box-by-box calibration on the production line (cabinet calibration); the other is on-site large-screen calibration (on-site calibration). On-site calibration technology can select a suitable viewing location for calibration to ensure that the LED display can achieve satisfactory display effects in the on-site application environment, but the complex and changeable on-site environment and off-site technical support are problems that limit on-site calibration. In particular, the cost and difficulty of on-site calibration for some foreign orders are relatively high.

In order to ensure the uniformity of the factory LED screen and reduce the cost of technical support, the cabinet calibration technology reflects its own unique value. Cabinet calibration can greatly improve the display quality of the spliced display, and it is more efficient than on-site calibration, not limited by time and space, and the cost is also low. Therefore, the cabinet calibration technology will become an indispensable part of the LED display manufacturing process and has a good application prospect.

1. Introduction to LED display cabinet calibration

Cabinet calibration is a kind of production line calibration, which requires LED display manufacturers to add this link in the production line. Under normal circumstances, the cabinet calibration is the last link before leaving the factory. It is mainly used to eliminate the brightness and chromaticity differences inside and between the cabinets, and improve the uniformity of the led display after splicing.

In addition to adding calibration links in the production process, manufacturers generally need to follow up on the calibration results of the screens when they leave the factory. There are three commonly used led video wall methods: one is to splice all the cabinets together and observe the display effect, but the workload of splicing is relatively large and it is inconvenient to implement; the other is to randomly select some cabinets for splicing and observe the correction effect; three It uses the measurement data recorded by the calibration system to simulate and evaluate the calibration effects of all cabinets. Added LED production lines for cabinet calibration and simulation evaluation/sampling inspection.

Cabinet calibration needs to be carried out in a dark room, and an area array imaging device and a colorimeter are required to measure the brightness and chromaticity information of each cabinet. In order to ensure that the calibration process of all cabinets is not affected by external environmental conditions and achieve the goal of consistent brightness and chromaticity, the darkroom is required to be completely sealed, and the temperature and humidity are constant values. During the calibration process, it must be fixed. The position of the cabinet and the calibration instrument, the cabinet must be placed on the base to avoid the influence of ground reflection.

Similar to on-site calibration, for each cabinet, the process of cabinet calibration includes data collection, data analysis, target value setting, calibration coefficient calculation and coefficient upload, and also requires the cooperation of the control system.

2. Key technologies and difficulties

Cabinet calibration is an effective way to improve the image quality of LED display screens. Its key technical aspects are mainly reflected in the following two aspects: one is the uniformity of pixels inside the cabinet, and the other is the consistency of brightness and chromaticity between cabinets.

1. Uniformity between pixels inside the cabinet

The inter-pixel uniformity correction inside the cabinet is basically similar to the on-site correction, and is relatively mature, including brightness and chroma uniformity correction and bright and dark line correction:

(1) Calibration of brightness and chromaticity uniformity The brightness and chromaticity information of each LED lamp in the LED box is measured by measuring equipment, and the measurement method involves knowledge of photometry, chromaticity and digital image processing; Then according to the corresponding calibration standard, calculate the corresponding correction coefficient and send it to the receiving card of the corresponding box; after the box is lit, the display control system will adjust the current of the LED according to the correction coefficient, so that all the LEDs in the box The brightness and chromaticity are consistent. the

Brightness correction is to adjust the brightness of fluctuating LEDs to a consistent level. In the process of adjusting brightness, it is necessary to properly reduce the maximum brightness value of most LEDs. Chromaticity correction is based on the principle of RGB color matching, and solves the problem of chromaticity deviation by changing the color coordinates of RGB three colors. The color coordinates are discretely distributed; the small triangle is the corrected display color gamut, and the RGB three-color color coordinates have better consistency.

(2) Due to the limitations of machining accuracy, assembly accuracy and other technological reasons, there is a slight inconsistency in the spacing of the spliced light boards. After the low-pass filtering process of the human visual system, bright or dark lines will appear in the display . Due to the limitations of the existing mechanical process, small-pitch display screens generally require correction of bright and dark lines to significantly improve the uniformity of the cabinet.

2. Consistency of brightness and chromaticity among different cabinets

There is a significant difference between cabinet calibration and on-site calibration, that is, the cabinets are not spliced during calibration, and there is no surrounding area as a reference during calibration, but after calibration, it is necessary to ensure that the cabinets are spliced arbitrarily and there is no difference in brightness and chromaticity . More importantly, the human visual system, as a band-pass filter, is not sensitive to gently gradual brightness differences or small angular resolution detail differences, but is extremely sensitive to edge step signals with mid- and low-frequency components. Applied to the field of LED display, it is reflected that the human eye can only distinguish more than 4-5% of the brightness difference between LED pixels, but can easily recognize the 1% difference in the brightness and chromaticity of the cabinet. That is to say, the human eye has lower requirements for the consistency of the pixels inside the cabinet, but higher requirements for the consistency between the cabinets. Therefore, the consistency of brightness and chromaticity between cabinets is a key technology unique to cabinet calibration.

The inconsistency of brightness and chromaticity between cabinets is mainly reflected in two aspects:

(1) There are differences in the average brightness and chromaticity between the cabinets. When splicing the cabinets, there will be obvious boundary lines. This can be achieved by adjusting the color gamut and setting a suitable target value; if necessary, it needs to be equipped with precision A higher colorimeter is used for auxiliary measurements.

(2) The brightness and chromaticity distribution of the cabinet presents a gradient distribution, which is caused by the gradient distribution phenomenon in the measurement data of the cabinet. Since the visual system is not sensitive to low-frequency, smooth gradient brightness differences, this problem is difficult to detect when correcting for a single box. But when the cabinets are spliced together, the brightness at the splicing point will jump greatly, forming an obvious splicing line. This requires a calibration system capable of detecting and resolving gradient distributions in the measured data.

When 4K TV was first launched a few years ago, there were overwhelming advertisements, but the actual experience was not very good. On the one hand, 4K TVs were mixed, and there were many fusses about panels, signal formats, and processing chips; On the one hand, 4K film sources are relatively scarce, and 4K TVs have become decorations. But this is not the case for the LED display industry. 4K can be said to be the best solution for ultra-clear small-pitch LED displays.

Challenges of small pitch high-end applications

As the technology continues to mature, small-pitch LED displays are becoming more and more popular in high-end display applications due to their own advantages. High-end applications have higher and higher requirements for display effects. For example, some require the best display effect, and must customize the material and point-to-point display, that is, the video material must be customized corresponding to the physical resolution of the LED display, and the video signal processing will not be scaled. , point-to-point display, such a single 1080p full HD interface can no longer meet the needs of small-pitch ultra-high-resolution display screens.

Traditional non-4K solutions are complicated to operate

Before the introduction of 4K processors, the common practice in the industry was to use multiple DVI output graphics cards to expand and splicing. As shown below:

One difficulty of this solution is that the operation is relatively complicated, and sometimes it is necessary to perform fusion processing on the patchwork, which requires a professional graphics card with fusion function. Another difficulty is the synchronization problem, whether it is AMD, NVDIA flagship graphics card or a fusion It is also difficult for multiple DVI output ports to be fully synchronized, so that tearing will occur at the splicing position.

Fast motion out of sync: tearing

Therefore, LVP86XX and other multi-window synchronous splicers need to be used. The specific wiring diagram is as shown in the figure below. The related fusion band calculation and synchronization settings are relatively complicated and require professionals to operate.

4K processor solution is easy to operate

Using a 4K processor device, only one HDMI or DP interface is needed to achieve the display effect that can only be achieved by 4 DVI output expansion splicing. The playback operation on the PC side becomes very simple, and for large-screen systems, the 4K processor LVP609 of Viovision converts 4K signals into multiple 1920x1080 resolution DVI outputs, and the multiple output ports are fully synchronized. It only needs to use ordinary sending cards to load together, and finally through the fast splicing function of LVP609, simply input a few parameters and the splicing can be completed automatically. In this way, there is no need to use a 4K sending card that is expensive and does not have scaling processing. At the same time, the rich indoor video wall display signal interface that comes with the processor also provides convenience for connecting to different devices.

LVP609 4K point-to-point display solution

Differences in the 4K signal itself

Regarding true and false 4K, it has been hyped for a while in the field of 4K TV. 4K refers to the resolution of 3840x2160 or 4096x2160. A signal whose width cannot reach 3840 cannot be called 4K, and a signal whose height cannot reach 2160 cannot be called 4K. The same 4K signal also has different differences, such as whether the frame frequency is 30Hz or 60Hz, whether the color space is YUV or RGB, etc. These bring obvious differences in image quality to LED displays with very good display effects.

The maximum frame rate of the HDMI 1.4 standard is 30Hz, that is, 30 frames of images are transmitted per second, while the maximum parameter of HDMI 2.0 is 60Hz, that is, 60 frames of images are transmitted per second. The parameters of 60 frames are twice as high as those of 30 frames, and the image quality and details are better. The higher the number of frames, the smoother the picture, which is best reflected in the intuitive experience. The higher the value, the closer the picture is to the real world observed by human eyes.

Color space is also a very important parameter. The most widely used formats are RGB and YUV. YUV has different sampling formats such as 4:4:4, 4:2:2, 4:1:1 and 4:2:0. Among them, RGB and YUV 4:4:4 have richer information and better colors, but require very high storage space and transmission bandwidth. Several other methods compress colors in order to save bandwidth and storage space.

The difficulty of 4K 60Hz processing lies in the large amount of data and high bandwidth. The point frequency of ordinary 1920x1080 60Hz is 148MHz, while the point frequency of 4K 60Hz is 594MHz, which requires high signal transmission and processing. For the LED display, it is also required that the signal transmission and processing cannot be dropped, and each DVI output port must be completely synchronized. Therefore, up to now, LVP609 is still the only 4K 60Hz LED video processor in China that truly supports RGB\YUV 4:4:4 input format.

With the continuous development of economy and technology, the control method of led large screen is also constantly changing. From conventional manual on-site computer operation to wireless remote operation, the control of led display has become more and more convenient. Wireless same-screen control is becoming more and more slowly into people's lives. The iPad has evolved from an entertainment device to a digital wireless control LED display large-screen system platform, and the iPad-controlled display large-screen technology has come. So, how to use the iPad to realize the same screen wirelessly?

Generally speaking, if the traditional screen control mode is to realize the wireless same screen function, many supporting facilities are required, such as desktop computers, video processors, audio switchers, professional digital high-definition video switchers, video wireless receivers, etc. If you want To realize wireless screen sharing, related facilities need to be used together, and the overall cost is high.

The Ao Pai wireless control screen system independently developed by Aureida realizes the wireless remote control of the LED display screen with the iPad. This mode gets rid of the traditional fixed computer control or the one-way picture and video transmission of mobile phones and tablets, and replaces multiple devices. The Aopai wireless control screen system can not only control the LED screen as you want, but also control the projector, LCD, PDP splicing screen, DLP and other screens. It has been widely used in hotels, villas, clubs, monitoring, commanding and other fields. .

In the process of use, it is only necessary to connect the AuPad central controller to the large screen, and then connect the iPad and the central controller to the same WIFI (that is, under the same control LAN), and then the user can control the AuPad to The large led screen is controlled synchronously, and the contents of the iPad and the large led screen are displayed wirelessly on the same screen.

The Aopai wireless control screen system can realize multiple screen playback modes, display multiple screens on one screen, support functions such as adding subtitles, virtual keyboards, and remote wireless one-key control of volume and brightness. The powerful Ao Pai brings more convenience to the wireless control of the large 50mm Flexible LED Mesh Screen screen, allowing people to enjoy the cool control and experience brought by wireless high-tech while enjoying the perfect color of the display!