This paper mainly introduces the LCD splicing, and focuses on the working principle and application of LCD splicing in detail.

LCD splicing

According to different use requirements, LCD splicing can realize the variable large screen function of screen segmentation single screen display or multi screen display: single screen segmentation display, single screen separate display, any combination display, full screen LCD splicing, double splicing LCD splicing screen, vertical screen display, image frame can be compensated or covered, and it supports roaming, scaling and stretching of digital signals, cross screen display, and the setting and operation of various display plans, Full HD signal real-time processing.

LCD splicing can not only be used as a display, but also be spliced into a large screen. According to different use requirements, it can realize the variable large screen function of image segmentation single screen display or multi screen display: single screen segmentation display, single screen separate display, arbitrary combination display, full screen LCD splicing, double splicing LCD splicing screen, vertical screen display, image frame can be compensated or covered, it supports roaming, scaling and stretching of digital signals, cross screen display, setting and operation of various display plans, and real-time processing of Full HD signals. LCD splicing is a complete finished product, which can be hung and used immediately. The installation is as simple as building blocks. The use and installation of single or multiple LCD splicing are very simple. The edges around the LCD splice are only 6.7mm wide, and the surface is also equipped with a tempered glass protective layer, a built-in intelligent temperature control alarm circuit and a unique “fast dispersion” heat dissipation system. It not only adapts to digital signal input, but also has unique support for analog signals. In addition, there are many LCD splicing signal interfaces, and the LCD splicing technology is used to realize the simultaneous access of analog signals and digital signals. LCD splicing series products use unique and the world’s most advanced digital processing technology to let users truly experience the full HD large screen effect.

Advantages of LCD splicing

1. LCD splicing screen, long service life and low maintenance cost. Liquid crystal is the display device with the longest service life. Its service life is very long. Even the backlight with the shortest service life is up to more than 50000 hours. Even if it is used for more than such a long time, it will only affect its brightness. The original bright color can be restored by replacing the backlight tube. This is essentially different from the rear projection. The service life of the LCD backlight is ten times that of the rear projection bulb; The biggest difference between LCD and projection is that LCD splicing technology is more mature with obvious power saving, and its advantages and disadvantages are obvious.

2. Large viewing angle of LCD splicing screen. For the early liquid crystal products, the visual angle was once a big problem restricting the liquid crystal, but with the continuous progress of liquid crystal technology, this problem has been completely solved. The did LCD screen used in the LCD splicing curtain wall has a visual angle of more than 178 degrees, which has achieved the effect of absolute viewing angle.

3. LCD splicing screen has high resolution and bright picture. The dot spacing of liquid crystal is much smaller than that of plasma. The physical resolution can easily reach and exceed the HD standard. The brightness and contrast of liquid crystal are very high, and the colors are bright and bright. The pure plane display has no curvature, and the image is stable and does not flicker.

4. LCD splicing screen is slim and light. LCD has the characteristics of thin thickness and light weight, which can be easily spliced and installed. The 40 inch dedicated LCD screen weighs only 12.5kg and is less than 10cm thick, which is unmatched by other display devices.

5. Low power consumption and low calorific value. Liquid crystal display equipment is always praised for its low power and low heat. The power of small-size LCD is no more than 35W, and the power of LCD over 40 inches is only about 150W, about one-third to one-quarter of that of plasma.

6. LCD splicing screen has long trouble free time and low maintenance cost. Liquid crystal is the most stable and reliable display device at present. Due to the small heating capacity, the device is very stable and will not cause failure due to excessive temperature rise of components.

7. Innovation and progressiveness

The 46 inch ultra narrow edge LCD splicing is only 1.4mm, and the 55 inch LED backlight ultra narrow edge LCD splicing is only 1.8mm, which is the most advanced LCD splicing at present. Samsung is also developing a splicing that can pass through the edge seam through a similar glass type, which will become a cross era of did LCD splicing.

Of course, since the backlight illuminant of liquid crystal products still adopts cathode vacuum tube (CCFL), the filament and tube base at both ends of the lamp limit the liquid

As for the size of the crystal plate, the frame of the did LCD used for screen splicing in 2013 still has a width of 4.9mm-22mm. Therefore, the only drawback of the LCD splicing curtain wall is that the splicing joint is slightly larger. However, with the investment of bsr-led backlight technology, this drawback will be significantly improved.

8. Economy

Considering the economy of the system, we should consider the cost performance. Only under the premise of high performance and high quality, the economy of the system is meaningful.

9. Well known LCD splicing brands: Samsung, LG, etc.

The plasma (PDP) splicing curtain wall on the market, however, has a high price. Generally, the price per square meter is as high as more than 100000, which is more expensive than the LCD splicing curtain wall. Due to its inherent defects, the price performance ratio is low. Although the price of DLP TV wall is relatively low, the replacement cost of light bulbs per year is as high as several thousand pieces per screen. One curtain wall can add up to tens of thousands or hundreds of thousands. In a few years, the cost is amazing.

LCD splicing curtain wall is widely welcomed at home and abroad for its excellent performance and reasonable price. With a service life of 50000 ~ 80000 hours, stable quality and low maintenance cost, it is the most cost-effective curtain wall at present.

The appearance of LCD splicing curtain wall solves various defects of traditional TV curtain wall, and provides the best large screen display system for convenient, comprehensive and real-time display of video information of each system, especially for remote real-time command, scheduling and other engineering applications.

One splicer can only designate one window as CBD display area;

Set as the window of CBD area, all windows of CBD input signal can be superimposed and displayed;

The display window of CBD signal area can be an independent display unit, a complete display splicing wall, or a partial splicing wall composed of some independent display units;

The maximum number of windows for CBD display depends on the number of hardware inputs for CBD input. Standard configuration: display 4-channel VGA or video signals at the same time; The signal input from CBD can only move in the CBD window, and cannot exceed the window range output by CBD;

CBD display area can form more modes of display with other sub input channels;

After multiple iws-4p splicers are cascaded, multiple CBD signal display windows can be set on the large splicing wall;

Use a separate computer with RS232 interface or network socket to connect to the large screen image processor for window operation: perspective, painting outside tile, painting in picture, window overlay, window roaming, window perspective and zoom;

The number of input channels of CBD can be configured in advance, up to 12 channels;

Technical principle of LCD splicing

Resolution introduction

The resolution of LCD mosaic screen is an important index related to the display image format. Generally, the resolution we refer to refers to the physical resolution of the LCD screen, that is, the number of points displayed on the screen, which is the horizontal and vertical pixel value, which determines the clarity of the LCD screen.

By 2013, the mainstream resolution of LCD splicing screen products is 1366 × 768 and 1920 × 1080, which conforms to the 16:9 widescreen ratio, 1366 × 768 is the minimum resolution limit that meets the national HD TV standard. In the future, there are three main formats for high-definition TV signals, namely 720p, 1080i and 1080p, which are also used by the popular Blu ray BD and HD DVD.

Some businesses like to make an article on the concept of “resolution”, with some physical resolutions being only 1366 × The 768’s small screen LCD is advertised as having a maximum supported resolution of 1920 × 1080, there is actually a trap here. Consumers are misled by the words “physics” and “maximum support”. How wide and how high pixels the LCD can display is entirely due to its physical resolution. A movie with the highest support of 1920 × 1080 resolution TV only indicates that the product supports 1920 × 1080 is just a signal input format. In addition to the panel characteristics, it is also related to technologies such as TV drive decoding. In fact, if the physical resolution of the panel is only 1366 × 768, such a panel displays 1920 × The signal picture of 1080 is not a point-to-point display mode with one-to-one correspondence, but the 1920 × The signal of 1080 is converted to 1366 conforming to the panel output × The 768 format is presented to the audience again, and this conversion process must be accompanied by the compression and loss of the picture effect. What the user sees is not the original 1920 × 1080 picture quality.

In addition, it should be noted that the resolution and screen width height ratio are not the same. Generally, the horizontal dot pitch and vertical dot pitch of screen pixels are the same, that is, the pixels are square, so the parameter ratio of resolution can be regarded as the screen width height ratio, for example, the resolution is 1366 × The panel screen ratio of 768 is 16:9. However, the horizontal dot pitch and vertical dot pitch of the screen pixels of some products are different, that is, the pixels are rectangular. At this time, the resolution parameters cannot display the width height ratio of the screen, for example, the resolution is 1024 × There is no contradiction between 1024 products and products with a screen ratio of 16:9. 1024 × 1024 does not mean that the screen of the product is square.

Distributed control technology

Distributed signal control technology is the patented control of IWS splicing processor

One of the technologies is that each independent module is used in the splicer for parallel processing. Before the signal is input into the splicer, the signal scheduling and control need to be completed through proprietary technology to achieve the balance between the signal transmission of each channel and the hardware bandwidth.

For the signal entering the non-public area, each window signal corresponds to an independent processing module and controls the display content of the corresponding display unit; The external matrix completes the signal distribution and scheduling switching; Input unimportant signals into CBD area. During window operation, the matrix completes the micro distribution of corresponding signals according to different window display modes. In some special cases, if more display bandwidth is required, part of the display function of the base map can be released to improve the bandwidth demand.

Principle function

LCD splicing is a specialized terminal display device specially designed for engineering applications. Based on FPGA array and parallel high-speed graphics processing technology, it realizes the unified processing of multi-channel high-speed video signals, fundamentally replaces the plug-in splicing controller, and solves the problem that the number of VGA signal input is limited. It integrates the most outstanding liquid crystal display technology with high definition, high brightness and high color gamut, embedded hardware splicing technology, multi screen image processing technology, signal switching technology, etc., forming an advanced liquid crystal splicing curtain wall display system with high brightness, high definition, low power consumption, high life. LCD splicing curtain wall is a new splicing method of large screen, which can be spliced infinitely. Flat panel splicing display technology will be the mainstream application technology of the next generation splicing display system. After years of development, liquid crystal display technology has occupied an important position in the field of flat panel splicing display. The splicing curtain wall is extremely light, ultra-thin, long-life, low maintenance cost, low power consumption, no radiation, high-definition, and has outstanding advantages, which has attracted much attention. LCD splicing curtain wall, with LCD as the basic display unit, integrates the latest LCD display technology and pure hardware high-speed real-time splicing control technology. All input signals can be freely displayed in the display wall window, fully supporting high-end display functions such as image cross screen, roaming, picture in picture, superposition, scaling, etc. The controller is tailor-made for the display screen and dedicated to the special machine, which can maximize the efficiency of the display unit. LCD splicing curtain wall, with clear image, flexible combination and rich display content, can give users the largest free design space and provide shocking display effect. LCD splicing walls are widely used in video monitoring, telecommunications, public utilities, process processing, traffic control, security monitoring, national defense, stage entertainment, television studios, stocks, large exhibitions, shopping malls, banks, office halls, corporate welcome screens, specialty stores, dispatching and command, etc. Practicality of LCD splicing curtain wall LCD splicing curtain wall has a large combination space: it can adopt small screen splicing or large screen splicing; Either one-to-one single screen splicing or a pair of M × N full screen splicing; You can also mix and assemble large and small screens. According to the system scale and application requirements put forward by customers for the LCD splicing curtain wall system, and according to the use environment of the system, appropriate products and splicing methods can be selected, and specific implementation schemes can be designed to meet the application requirements of the system.

Different video processing systems can be selected according to the user’s requirements for input signals to realize VGA, composite video, S-Video, ypbpr/ycbcr or DVI signal input to meet the needs of different signal input in different applications. Through the control software, various signals can be switched, spliced into full screen display, any combination display, image stretching display, image roaming display, image overlay display, etc. LCD splicing curtain wall can create personalized system and provide different implementation schemes and technical support according to different needs of customers.

The difference between LCD splicing screen and led splicing screen

1. high brightness and high contrast: did LCD splicing screen has higher brightness, which is different from ordinary TV and PC LCD? The brightness of TV or PC LCD is generally only 250~300cd/m2, while the brightness of did LCD can reach more than 700cd/m2. The did LCD splicing screen has a contrast ratio of 1200:1, or even 10000:1, which is more than twice as high as the traditional PC or TV LCD screen and three times as high as the general rear projection.

2. thanks to the color calibration technology professionally developed for did products, this technology can not only calibrate the color of still pictures, but also calibrate the color of dynamic pictures. Only in this way can the accuracy and stability of picture output be ensured. In terms of color saturation, didlcd can reach a high color saturation of 80%-92%, while the current color saturation of ordinary CRT is only about 50%.

3. the brightness is uniform, and the image is stable without flickering. Because each point of LCD will always maintain that color and brightness after receiving the signal, unlike CRT, which needs to constantly refresh pixel points. Therefore, the LCD has uniform brightness, high image quality and absolutely no flicker.

4.120hz frequency doubling refresh frequency, the 120Hz frequency doubling LCD technology of did products? Can it effectively solve the tailing and blurring in the process of rapid image movement? Enhance image clarity and contrast? Make the picture clearer? It is not easy for human eyes to get tired after watching for a long time.

5. wider visual angle, using this technology? The visual angle can reach double 180 ° (horizontal and vertical). Through the application of PVA technology, namely “image vertical adjustment technology”, the LCD splicing screen has a wider visual angle.

6. pure flat panel display. LCD is the representative of flat panel display equipment. It is a real flat panel display, completely without large curvature screen? No distortion.

7. Ultra thin narrow edge design, LCD splicing screen not only has the characteristics of large display area, but also has the advantages of ultra light and thin. It can be spliced and installed conveniently. The special splicing LCD screen has an excellent narrow edge design, so that the edge of its single chip is even less than 1 cm. Such a small edge effect will not affect the overall display effect of the whole display screen.

8. high service life. The service life of the backlight of the didlcd LCD screen can reach more than 50000-100000 hours? This ensures the consistency of brightness, contrast and chromaticity of each LCD used in the splicing display after long-term use? And ensure that the service life of the display screen is not less than 50000 hours.

9. the reliability is better. The ordinary LCD screen is designed for TV and PC monitors and does not support continuous use day and night. ID LCD is designed for monitoring center and display center? Support 7×24 hours of continuous use.

Difference between LCD splicing screen and LED display screen: characteristics of LED display screen

1. strong luminous brightness. When the sun shines directly on the screen surface within the visible distance, the display content is clearly visible

2. automatic brightness adjustment has the function of automatic brightness adjustment, which can obtain the best playback effect in different brightness environments

3. video, animation, charts, text, pictures and other information display, online display and remote control

4. advanced digital video processing, distributed scanning technology, modular design / constant current static drive, automatic brightness adjustment

5. super gray level control has 1024-4096 gray level control. The display color is more than 16.7M. The color is clear and lifelike, and the three-dimensional sense is strong

6. static scanning technology adopts static latch scanning mode and high-power drive to fully ensure luminous brightness

7. imported large-scale integrated circuits are fully adopted, which greatly improves the reliability and facilitates commissioning and maintenance

8. Static scanning technology adopts static latch scanning mode and high-power drive to fully ensure luminous brightness

9. the image shall be clear without jitter and ghosting, and distortion shall be eliminated

10. super bright solid color pixel

11. the all-weather work can fully adapt to various harsh outdoor environments. It is waterproof, moisture-proof, anti-corrosion, lightning protection, strong overall anti-seismic performance, good display performance and high cost performance. The pixel cylinder can adopt p10mm, P16mm and other specifications.

Difference between LCD splicing screen and LED display screen: Application

1. LCD splicing screen is widely used in financial and securities information display terminals; Airport, port, wharf, subway, highway and other transportation industry information display terminals; Commercial, media advertising, product display and other display terminals; Dispatching and control room VI, radio and television, large-scale studio / performance place; Mining and energy safety monitoring system; Fire control, meteorological, maritime, flood control and traffic hub command system; Military, government, urban and other emergency command systems; Education training / multimedia video conference system.

2. LED display screen shall be used in sports, advertising, factories and mining enterprises, transportation, stations, wharves, airports, hotels, banks, securities markets, construction markets, taxation, shopping malls, hospitals, finance, industry and commerce, posts and telecommunications, education systems, auction houses, industrial enterprise management and other public places.

epilogue

That’s all for the introduction of LCD splicing. I hope this article can give you a more comprehensive understanding of LCD splicing.

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