Large screen display system

System overview

The following introduces the main principles and matters needing attention in the design and equipment selection of large screen display system for readers’ reference.
Large screen display system is collect a variety of information receiving process, to the sound and light more class personnel operation control in the integration of the various technical problems, also involved in the management of the relevant departments of the coordination problem, also is closely connected with display hall overall structure, must pay attention to the multimedia interactive system, demand is given priority to, overall consideration, using integrated technology, to achieve the desired effect.

Main functions and requirements

  1. Information reception
    The system should be able to receive not only VGA, RGB and network computer information, but also broadband voice and video signals, and carry out appropriate information conversion according to needs.
  2. Information display
    The system can publish shared information in the form of multimedia, and display situation, text, forms and video image information in different modes and according to the division of regions. Situation display is required to be clear, high resolution, text, image display is clear and stable. BSV liquid crystal splicing technology to achieve the system window roaming, picture in picture functions.
  3. Preview, camera and switch
    In order to ensure the accuracy and quality of projection display information, the system must have preview function, which is used for pre-examination of images. A camera is installed in the display hall to extract video images of the work of the management control mechanism. The system should have switching display function to meet the need of multi-channel information display.
  4. Teleconferencing
    The system can make use of monitoring, preview, switching, communication and terminal control equipment to maintain video contact with relevant parties, and can hold a teleconference at any time.
  5. Control mode
    The system allows leaders, business staff, security personnel, with centralized control, mobile control, authorization control, on the large screen switch machine, open a window, select information sources, projection display, adjust the sound and lighting operations.
  6. Optimize the design according to standards
    System equipment configuration is complex, cable signals are numerous, installation process and environmental conditions have high requirements, according to machine line standardization, electromagnetic compatibility standards and large screen installation requirements, engineering wiring and equipment installation to ensure long-term stable operation of the system.

System technology

First, an RGB chromaticity space, from black to white, with each vertex being a certain color. In this chromaticity space, the whole RGB THREE-DIMENSIONAL space is decomposed into many small cubes through the 3D lookup table. When we process any color, we will find its position and overlay a gain it needs in a small 3D space.
For each input in the red, green, and blue channels, we have a desired output value, and there will be a corresponding relationship. And by looking it up in all three dimensions, you know what kind of gain you need.
What performance improvements does the six-color wheel have compared to the three-color wheel? First of all, let’s take a look at the middle color. In addition to the triangle of RGB color gamut, any middle part of the middle color actually has a direct relationship to the performance of the middle color. Extreme color technology can increase the brightness and saturation of the entire mid-tone because we use different complementary color segments.
In addition, the design of the whole color wheel is more flexible, because OEM can design the color wheel according to the actual product positioning. For example, business models may use yellow and white to enhance brightness; Home models may have less or no white, but more yellows, cyans and magenta to enhance the color, all of which can make a big difference in the end. As a result, different projectors on the market have different color wheel designs, and Oems have great flexibility in design.
Today, different DMD chips are available with Acme Color technology, which has been used in DLP projectors of various resolutions. Generally speaking, the emergence of acme color technology has greatly improved the utilization efficiency of the whole color wheel. Before the price of 3-film DLP projector is greatly reduced, the popularization of acme color technology has far-reaching significance.
It is worth mentioning that high contrast can also add to color performance. Contrast is related to the level and detail of the image. Rich colors with clear lines and rich details make users feel as if they are sitting in the front or the back. In general, DLP projectors have a raw contrast ratio of at least 200:1 and dynamic contrast ratio of more than 10,000:1.
In 2007, more than 70 DLP projectors with extreme color entered the market, causing great attention in the projector industry. In the coming years, DLP’s ultimate color technology will continue to be the absolute backing of DLP projectors in color representation. As more and more projectors with acme color technology are put on the market, projectors will also enter the new era of multi-color processing from the traditional three-color processing.

System features

Big screen display system is widely applied in communication, electric power, military command, the information sharing, decision support, situation display, split-screen display BSV LCD splicing plays an important role, the following of the large screen display system is introduced in this paper the main principle and the matters needing attention in the design and equipment selection, for readers reference.
DLP large screen display system is widely used in public security, electric power, telecommunications, water conservancy and other government departments, as well as monitoring, communication, security and other fields.
reliability
DLP large screen display system adopts the original imported projector, the full digital high integrated circuit design of the projector ensures the stability of the system. Because the projector uses advanced DLP technology, the projector equipment without burning dead phenomenon, 24 hours a day long-term continuous use will not be any damage to the projector, no impact on the display effect. From the display after installation and debugging to the display after several years can maintain the same display effect, to achieve the same clarity, resolution, precision.
practical
DLP large screen display system often plays an important role in the discovery of emergency situations, through the rapid acquisition of a variety of dynamic image signals, for leadership decision-making and command to provide an auxiliary role. The operation of large screen system, the switching and zooming of window and the switching of signal source are simple and convenient.
The advanced nature
With the rapid development of information technology, the application of high-tech means in the seismic command center auxiliary decision system is more and more common. As the centralized display terminal of all kinds of signals (computer, video, network, etc.), the large screen projection display system must have the characteristics of high resolution display, uniform and stable color, and good compatibility with all kinds of signals. Using the latest advanced technology of Texas Instruments (TI) 0.7inch DMD chip, the optical efficiency is about 10% higher than 0.9inch DMD chip. The color level and contrast of the image are obviously improved by using the DMD microlens with 12 degree deflection Angle compared with the 10 degree deflection Angle microlens. Perfect color consistency, effectively inhibit the dispersion of the three primary colors between each screen, to ensure the height of color consistency. Eliminate the “sun effect” so that the brightness of the screen is uniform. The whole screen can reach 90% brightness uniformity: adjustable to 100% uniformity Advanced screen processing technology, with anti-reflection, high brightness, wide Angle of view, seamless stitching, good uniformity, not easy to deformation. Its unique integrated built-in image processing system can be directly connected to the digital signal (DVI-1), and can be compatible with all kinds of video signals, analog/digital computer signals and network signals, which can meet the application requirements in several years.
open
The projection splicing wall system follows the principle of open system. The system can not only access computer RGB signal, video signal, but also access network signal. Through the dynamic comprehensive display of all kinds of computer graphics, text and network information, video and image information of signal system and GIS system, the real-time monitoring of geographical conditions, earthquake conditions and other information is realized, providing a high definition, high brightness, high intelligence interactive platform for monitoring personnel and leaders.
economy
DLP large screen projection Mosaic wall is the most advanced and “expensive” display system available. Its “expensive” is not only reflected in the early hardware input, but also in the later maintenance costs and consumables costs. Therefore, it is a wise choice to choose an internationally famous product with perfect quality assurance system, stable quality and excellent service.
maintainability
The display system should facilitate fault diagnosis and component replacement to shorten the failure time. Preventive maintenance keeps breakdowns to a minimum. DLP projection splicing unit adopts advanced modular structure, projector, bulb, screen, mirror can be easily disassembled. It only takes 2~3 minutes to replace a bulb. The control board, power module and color separation wheel of the projector are all separate modules, so it is very convenient to replace.
scalability
The system has the ability to add new equipment and new functions, and the software can meet the requirements only by simple expansion, without changing the source program; Hardware just needs to be added accordingly. Make the system keep up with the development needs of The Times. DLP projection splicing unit adopts box structure and block splicing, which makes it very simple to expand equipment in the future. In addition, the graphics controller also adopts open modular structure, as long as the corresponding board is added, the expansion function can be realized.
anti-interference
The system shall have reliable anti-jamming measures, free from electromagnetic interference from earthquake and other systems, and free from electromagnetic interference from other systems. True color DLP large screen splicing wall system has anti-atmospheric overvoltage, electromagnetic wave, radio and static interference. It has good shielding and isolation effect on strong electromagnetic field and static electricity. All electronic products meet the electromagnetic compatibility standards stipulated by national standards. All products in the external electromagnetic field and static interference, will not appear any picture pulsation and disturbance.
manageability
The design and integration of software and hardware of the system should be fully considered to make the whole system simple to operate, friendly man-machine interface (Chinese interface is required), scientific management, convenient and easy to maintain.
flexibility
According to the adjustment of command mode, the system structure can be adjusted quickly to meet the needs of command and dispatch.
Environmental protection and energy saving
The pursuit of high efficiency and low cost is a necessary measure for all industries to step toward commercialization. Therefore, reasonable performance-price ratio is an important content that should be considered in system design. In this scheme, the equipment selected in consideration of excellent performance on the basis of full consideration of economy, the overall cost of the system is very economic, in addition, should also consider the long-term operation cost of the system.

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