Five misunderstandings when choosing an LCD video wall: you should know!

LCD video walls have become a well-deserved main force, and are widely used in government, education, security and other fields. Five common misunderstandings in the purchase and application of LCD video walls: 1. Not the thinner the better 2. Splicing The larger the size of the unit, the greater the power consumption is not necessarily greater 3. There are temperature restrictions 4. There will be no color difference 5. When using the LCD video wall for a long time, it is best to let it rest intermittently.

Five misunderstandings of efficient application of LCD video wall

In today's commercial large-screen display market, LCD splicing has become a well-deserved main force, and is widely used in government, education, security and other fields. For the majority of industry users, although the LCD video wall is not unfamiliar, most of its understanding is superficial, and they do not have professional knowledge, which directly leads to many users inevitably purchasing and applying products. will fall into some misunderstandings, which will ultimately affect the use effect. See this article to comprehensively sort out several common problems in the purchase and application of LCD video walls to help industry users use them efficiently.

 

LCD video walls

The thinner the LCD video wall, the better?

With the continuous maturity of LCD splicing technology, LCD video walls are becoming thinner and thinner. Under the vigorous publicity of industry manufacturers, the advantages of thin and light products have been well known by many industry users. For example, the weight is reduced, the screen experience is more beautiful, it is easier to install, and it can also speed up the response time. Relevant studies have shown that if the thickness of the spliced ​​large screen is reduced by 20, its response speed will be increased by 35 on the original basis. So, does this mean that the thinner the LCD splicing product, the better? The answer is of course no, because the thinner the product will also bring certain negative effects, users must understand before purchasing.

The thinner the thickness of the product, the higher the requirements for the manufacturing process. If the manufacturing process is not up to standard, not only the color displayed on the screen will become dim, but the viewing angle will also become smaller, and at the same time, the probability of dead pixels on the screen will also increase. , and the yield of the product will decrease. So far, there is no complete set of technology in the industry to solve the above problems. Therefore, to produce thin and light products, the production cost of manufacturers will increase a lot. Correspondingly, if it is transferred to industry users, the cost of use will also be greatly increased. . High cost and many hidden dangers are what users must consider when they are pursuing the ultimate light and thin products. Of course, if conditions permit, they must choose, and it is best to choose big brand products with guaranteed quality and after-sales service.

The larger the size of the LCD splicing unit, the greater the power consumption?

In the current field of LCD splicing, large size and energy saving and environmental protection have become equally popular trends. However, for many industry users, this has become the frustration of "you can't have both fish and bear's paw", because, in the subconscious mind of many people, large size will bring large power consumption? This is not the case .

Relevant studies have found that the power consumption of LCD splicing units of different sizes does not change much. For example, the mainstream 46-inch, 50-inch and 60-inch LCD splicing units on the market consume roughly the same power under the same conditions. Strictly speaking, the power consumption of the LCD video wall is determined by the number of LCD splicing units. The splicing unit is used to reduce the number of splices, but it will save more energy.

No temperature limit for LCD video wall applications?

With the continuous improvement of market awareness, the application scope of LCD video walls has been continuously expanded, which has created its "universal" attribute for many industry users. In fact, if you want to ensure the efficient application of LCD video walls, the surrounding environment temperature is a factor that cannot be ignored. Generally speaking, the best use temperature of the LCD video wall is between 0 and 40 degrees Celsius, because the thermotropic liquid crystal used in the LCD screen is derived from the change of temperature, and its photoelectric effect is controlled by temperature. Within the temperature range of use, it is equivalent to getting rid of the electric field control without the photoelectric effect, and various problems will occur.

In practical applications, if the temperature conditions of the application environment are harsh, the user is best to install an air conditioner and set the temperature between 25 and 26 degrees Celsius to ensure that the LCD video wall is in the best working condition.

LCD video wall will not appear chromatic aberration?

It is well known that DLP video walls will have color attenuation after a period of use, that is, chromatic aberration, which affects the use effect. For this, some LCD splicing manufacturers have no chromatic aberration as an important promotional point in their marketing. So, is there really no chromatic aberration in the LCD video wall? In fact, the LCD video wall will also experience color attenuation after a period of use, and this attenuation is irreversible, but its attenuation does not happen often. Moreover, in response to this, many manufacturers have certain adjustment methods to effectively prolong the service life.

Does the LCD video wall need a "rest"?

In the current LCD splicing market, continuous operation of 7x24 hours has become a key element in the marketing promotion of manufacturers. So, in practical applications, does the LCD video wall really need to rest? In fact, if users want to prolong the service life of the LCD video wall as much as possible, they should try to give it a "holiday".

Relevant studies have found that if the LCD video wall works continuously for more than 96 hours at full load, it will accelerate its aging, and even burn out in severe cases. Therefore, when the LCD video wall works for a long time, it is easy for some pixels to overheat. It will cause permanent damage. Therefore, when the user uses the LCD video wall for a long time, it is best to let it rest intermittently for a while. Tweak a little while waiting for the working state.

Conclusion:

The continuous expansion of the application scope has made the user group of LCD video walls more and more popular. Although they are not unfamiliar with the application of LCD video walls, the related majors are very scarce. Therefore, iSEMC, as an industry manufacturer, if they want to adapt The trend of industry transformation and to establish the image of one's own comprehensive service provider, it is necessary to try to guide users professionally in basic purchase and application details, so as to quickly enhance the user's sense of trust, so as to win greater play for the subsequent plan formulation. space.

Merry Christmas

iSEMC professional video wall solution provider, hereby wish you and your family a Merry Christmas;

 

What are the types of video walls?

The video wall refers to the splicing of different numbers of screens into a large display screen to achieve the effect of image magnification display. In addition, it can also integrate multiple screens and display them on one screen at the same time to achieve multiple functions. Common application areas include outdoor large screens, monitoring command centers, conference rooms, etc. According to different functions, the video wall also includes a variety of display technologies.

So now, what types of video walls are there?

Four types of large-screen splicing technology: LED, LCD, DLP, PDP
The mainstream display products on the market include LED displays, LCD displays, etc., which represent the latest technology. Among them, the application of large-screen splicing technology is undoubtedly one of the hottest topics. The following four types of large-screen splicing technology are the most popular Representativeness, let’s make a simple comparison of their advantages and disadvantages for the convenience of friends to understand.

LED display

LED display
By controlling the display mode of semiconductor light-emitting diodes, the red, blue, white, and green LED lights are turned on and off to display text, pictures, animations, videos, and content. 
LED splicing display is a kind of large screen, which is mainly spliced ​​by LED unit boards. The distance between the lamp beads on each unit board is different, and its display effect is also different. Its main function is to be used as a large screen, like a square. Large screens and sky screens in shopping malls have the advantage of seamless stitching, but the disadvantage is the lack of resolution. There are more outdoor applications.

Focus: bigger, thinner and more stable
Advantages: long life, spherical display, strong and durable, suitable for outdoor applications
Disadvantages: The pixel points are sometimes obvious. The industry's finest LED point pitch is 1mm, which is not easy to miniaturize.

LCD Video Wall

LCD video wall
The LCD liquid crystal display technology is adopted, and a back-illuminated screen is formed through the liquid crystal panel to form a full-HD, colorful screen. This display technology is characterized by clear pictures, high contrast, and mature technology, which is currently the mainstream A display technology, compared with our home LCD TVs, LCD video walls are industrialized on the panel based on this, so as to achieve the requirement of continuous startup, and its frame is only a few millimeters, so after splicing it together The impact of the image is very small. With control equipment such as a decoder or matrix, it can realize functions such as monitoring, decoding, display and signal switching. It is currently widely used in various monitoring centers and conference displays.
The liquid crystal itself does not emit light, it relies on the backlight tube to emit light, so the LCD screen depends on the backlight tube.

Focus: taller and thinner
Advantages: high resolution, thin thickness, light weight and long life
Disadvantages: There is a delay problem, and the splicing gap is obvious

DLP video wall
Digital light processing, that is to say, this technology needs to digitally process the image signal, and then project the light.
DLP is a rear projection device that uses a kind of reflective imaging technology on a screen. Its core equipment is an optical machine, which mainly includes two types of laser light sources and LED light sources. It is the main equipment used in monitoring and display in previous years. The seam is very small, basically negligible, the single screen size is large, ranging from 50 to 100 inches, the defect is high and the maintenance cost is high, the lights and the optical machine need to be replaced regularly, and the equipment is large in size, and the space requirements are relatively high. However, with the rise of LCD video walls, this market has been devoured more seriously. At present, it is only used in some large-scale occasions, such as public security traffic police command centers and data analysis centers.

Focus: bigger and higher
Advantages: seamless splicing, the largest display area, support for spherical display
Disadvantages: high maintenance costs in the later period, lamp life problems, must have a projection distance

 

Plasma PDP splicing
The ion display is a display device that uses gas discharge to emit light. This screen uses a plasma tube as a light-emitting element.

Focus: thinner
Advantages: high brightness, short response time
Disadvantages: limited by materials and processes, the screen size is small and the display quality is poor. In terms of the development trend of the entire industry, the development potential of plasma splicing is limited, and it will definitely be replaced in the future


Summary: The advantages and disadvantages of the above four types of large screens are different. Of course, it is not to say which screen is not good. They are suitable for use in their respective fields. Among them, LED display screens, as a key product in the field of large screens, have prospects in outdoor advertising, stage dance and other fields. broad.

build LCD video wall

How to build an LCD video wall

The installation of the LCD video wall is not like ordinary display equipment, just simply put it on and install it.

The installation of the LCD video wall should not only choose the installation site carefully, but also pay attention to the light around the installation environment, but also need to pay attention to the wiring, and there are also requirements for the frame.

install LCD video wall

 

How to build an LCD video wall

The choice of LCD video wall installation floor:

The installation floor of the LCD video wall should be flat, because the entire system of the LCD video wall is relatively large in terms of volume and weight.

The selected floor also needs to have a certain ability to bear weight. If the floor is tile, it may not be able to bear its weight. Another point is that the installed ground must be anti-static.


Cautions for video wall wiring:

When installing the LCD video wall, pay attention to distinguishing its power cord and signal line when wiring, and install them in different places to avoid interference.

In addition, according to the size and installation position of the screen of the entire project, calculate the length and specifications of the various lines needed, and calculate the needs of the entire project.


LCD video wall requirements for ambient light:

Although the brightness of the LCD video wall is very high, it is still limited after all, so the light around the environment where you choose to install cannot be too strong. If it is too strong, you may not be able to see the picture on the screen.

The light that may enter near the screen (such as a window) should be blocked if necessary, and it is best to turn off the light when the device is running to ensure the normal operation of the device. Do not install a light directly in front of the screen, just install a downlight.

Video wall frame requirements:

In order to facilitate the maintenance of the LCD video wall in the future, the frame edging must be a detachable edging. A gap of about 25mm is reserved between the inner edge of the outer frame and the outer edge of the splicing wall. For large splicing walls, the margin should be appropriately increased according to the number of columns.

In addition, in order to enter the cabinet for maintenance later, the maintenance channel is in principle not less than 1.2m wide. It is advisable to press the detachable side strip 3-5mm from the edge of the screen. After the cabinet and the screen are fully installed in place, fix the detachable side strip finally.

Ventilation requirements for installation environment:

In the maintenance passage, air conditioners or air outlets must be installed to ensure that the equipment is well ventilated. The location of the air outlet should be as far away as possible from the LCD splicing wall (about 1m is better), and the wind from the air outlet should not be blown directly against the cabinet to avoid damage to the screen due to uneven heating and cooling.  

At the LCD splicing construction site, the installation and debugging should be based on the phenomenon reflected by the fault to determine the cause, and the synchronization interface and transmission cable of the equipment should be checked, and the synchronization frequency range of the signal source and the display terminal should be compared.

If the image has ghosting, check whether the transmission cable is too long or too thin. The solution is to change the cable to test or add a signal amplifier and other equipment.

If the focus is not ideal, you can adjust the display terminal. Facing the emergence of problems, we must first learn to analyze, so as to better solve the root cause of the problem. Through strong analysis, inspection time can be shortened.

These methods are some methods and skills for debugging after installation. The installer must be proficient and good. Only professional people can do professional things.

 

Professional knowledge about LCD video wall technology

 

LCD video wall

Manufacturers who develop and produce LCD video walls know that the production process of industrial-grade LCD screens is much higher than that of ordinary display equipment. Even with the same panel level, the production requirements for LCD video walls are more stringent.

Although many security surveillance companies have begun to use LCD video walls, their understanding of LCD video walls is too simple, and their understanding of industrial-grade display equipment is very simple.

In fact, the construction and selection of many LCD video wall engineering companies do not meet the specifications at all, even if they choose foreign brands. Many large-screen display projects have not fully exploited the advantages of LCD video walls, and have not achieved high-definition effects with minimal joints.

From a microscopic analysis, more companies only know about installation and lack the necessary knowledge. Today, LCD video wall manufacturers will add some professional knowledge for everyone.

1. The comparative advantages of LCD video walls and other computer monitors

The LCD video wall uses an A-level LCD panel, high reliability to ensure quality display. For large screens, the role of the LCD panel is undoubtedly the most important, which accounts for about 70% of the cost, and the general display chooses the A-level panel There will be an increase.

At present, LCD panels are divided into A+, A-, B+, and B-. The B+ panel is a good choice for computer monitors. However, the operating environment of the LCD video wall also determines the higher requirements for LCD panels.

2. Ultra-narrow frame design of LCD video wall

The LCD video wall has no frame, slim design on both sides, and uses less than 1 mm cable, which is significantly better than the BSV LCD splicing technology of general display equipment.

It is bound to set off an upsurge of seamless LCD splicing in the monitoring field, which will form a "blowout effect" of market demand.

3. High resolution LCD video wall supports point-to-point display

For “other devices”, the main focus is on the chip for signal input processing. Although the parameters shown can reach 1080P, they are not full HD HDCP displays. The liquid crystal displays are not point-to-point horizontally from 1920 to 1920. Vertical display panel composed of 1080 pixels

4. The LCD video wall uses high-quality electronic components (IC, capacitors, inductors, etc.)

The quality of LCD video wall products has a strict component selection system and a complete production line. The products of each production line go through rigorous roasting machines and tests.

Unlike "other machines", the procurement time of panels is very tight when they leave the factory, and the production and assembly are free to leave the factory. Because "other machines" do not have products in stock, the panel assembly, production, processing, and installation for customers only when they are delivered, the time is generally very short.

The quality of ICs, capacitors, and inductors directly affect the life and safety of the display.

5. The LCD video wall has unique DNIEPro color and signal enhancement complementary technology

For the liquid crystal display, the control IC that restores the precise control of the color can make the display effect of the liquid crystal display more colorful.

Its control IC can screen out 1 billion best colors from about 68.6 billion colors, which is more accurate in restoring the colors of objects.

The general display signal board simply decodes the signal and displays it directly, without IC processing.

6. The LCD video wall has a dynamic enhancement signal to ensure the dark and white color and dynamic smear phenomenon

The design and material selection of the IC chip and control circuit of the display are also extremely important. The first-tier manufacturers have their own panel production lines, which can design and develop the control circuit from the most professional perspective. From the materials to the workmanship, the large-screen display can be guaranteed to be long. Stable work with time, and strengthen processing of various input signals at the same time to ensure the effectiveness of grayscale.

7. The LCD video wall adopts advanced power supply DPMS

The DPMS management system maximizes the power supply and signal board to protect the LCD panel while reducing power consumption.

In the "lamp driving circuit" of the display, the high-voltage bar is connected to the lamp tube inside the panel to light it and control its brightness. Therefore, the brightness of the display is mainly related to the number of lamps placed in the panel, the more the number, the higher the brightness.

For "other devices", all CCFL tubes in the panel are driven to light up, so that the display will work with high brightness for a long time and will cause long-term heat to seriously damage the life of the panel. Why is the LCD video wall called a low-heat panel? The mystery is not on the LCD panel, but on the drive motherboard to use the chip to automatically light up the CCFL lamp in the panel.

What is the controller for the LCD video wall to enter and exit?

What is the controller for the LCD video wall to enter and exit? Did you choose the right one?

When corresponding to a real-time screen display system, under normal circumstances, customers will ask how many signal processors are needed, which is actually controlled by the control that forms the screen.
Outside the screen, the most important display is the complete signal processing equipment, which also determines the function of the entire screen. At this time, we need to configure the signal processing equipment according to our needs.

Distributor: It is commonly used when there is only one signal and input to display a large screen.
According to the number of image screens, the corresponding distributors are 1 in 4 out, 1 in 8 out, 1 in 16 out, etc.

Matrix: came into being on the basis of the simultaneous distributor. The function of the matrix is ​​more single, it supports a variety of signal source input, and can be displayed on a large screen.
For example, we have 3 computer signals that need to be displayed on the screen, the upper limit is 15 screens, and a 4-input 16 matrix can be configured to switch and display each signal at the same time.


The decoder is professionally used for the decoding of video surveillance signals on the screen, including the front end connected to the video screen machine.
In addition to the function of the matrix, it can also achieve the screen split display function, such as displaying up to 64 images in one screen. This greatly improves the arrangement of the screen pictures.


Image and video processor: In some large control room, in addition to simple and decoding functions, sometimes they can also enlarge the screen and screen functions,
such as enlarging a certain image on the screen and displaying another image on it, compared to decoders The function is smaller.