Large-screen display systems are widely used in communications, electric power, and military command organizations. They play an important role in providing shared information, decision support, and situation display. The following introduces the main principles and precautions in the design of large-screen display systems and equipment selection .
The large-screen display system is a multimedia interactive system that integrates a variety of information reception, processing and display, and multiple types of personnel operation and control. It involves various technical issues of sound and light, and also involves the management and coordination of related departments, and is inseparable from the overall structure of the display hall. , We must focus on demand, overall planning, and the use of comprehensive integration technology to achieve the desired results.
1. Main functions and requirements
The design of the large-screen display system must first put forward requirements. The following are the main functions and requirements for general use.
The information receiving system must not only receive VGA, RGB, and network computer information, but also receive broadband voice and video signals, and can perform appropriate information conversion as needed.
The information display system can publish shared information in the form of multimedia, and can display situation, text, tables and video image information in different modes and according to divided areas. Requires clear situation display, high resolution, clear and stable text and image display.
Preview, camera and switch To ensure the accuracy and quality of the projected display information, the system must have a preview function for pre-review of the image. Cameras should be installed in the display hall to extract video images of the work of the management and control organization. The system should have a switching display function to meet the needs of multi-channel information display.
The video teleconference system can use monitoring, preview, switching, communication and terminal control equipment to maintain video contact with relevant parties, and video teleconferences can be held at any time.
The control mode system allows leaders, business staff, and security personnel to switch on and off the large screen, open windows, select source, project display, adjust audio and lighting, etc., by means of centralized control, mobile control, and authorized control.
Optimizing and designing the system according to the standard equipment configuration is complicated, the cable signal is various, the installation technology and environmental conditions are high, and the engineering wiring and equipment installation must be carried out in accordance with the machine line standardization, electromagnetic compatibility standards and large-screen installation requirements to ensure the long-term stable operation of the system .
2. System layout
1. Basic layout
The available layout schemes of the large-screen display system are: cinema type, round table meeting type, lecture classroom type, and linear type.
The large screen in the theater layout is in the front of the display hall, the leader seat is in the center, the salesman seat is located at the front and back or both sides of the leader, and the technical support personnel are in the special control room behind the leader to facilitate the observation and control of the large screen display. . Observation seats are in the back row or outside, and their visits or observations will not affect normal work. This layout makes each seat in the best viewing position of the large screen as much as possible, which is conducive to expansion of seats. It can accommodate more people and is suitable for a management system for decentralized decision-making. Therefore, the screen size can be larger and more than one, and it can be arranged in a centralized manner. In front of. But this layout is not conducive to conversations between leaders and other members.
The round table conference layout can have three screens. The main screen is located at one end of the round table, and the auxiliary screens are located on both sides of the main screen. The angle between the screens depends on the number of people. The leaders are located at the other end of the round table and are in the best viewing position. The salesmen or decision-making assistant leaders are located on both sides of the round table, mainly watching the screen on the front of the seat. This structure is helpful for leaders to watch the big screen and discuss with other members, but it is not conducive to assist decision-making leaders to watch other screens. It needs to be solved by reasonably dividing the display area and content.
The large screen with a lecture hall layout is located right in the front. Various types of personnel are arranged in a ladder-like position according to their importance to normal work. The main decision-making leaders are in the best viewing position of the large screen, followed by the rest. Between the seats and the screen, place a speaking platform for speakers. This layout is suitable for management organizations that have a large number of leaders and observers, and rely entirely on the information provided by the large screen to make decisions. The linear layout of the large screen is straight or curved. The large screen is divided into several areas according to departments, directions or tasks. The relevant leaders are located in the best viewing positions of the corresponding areas and perform management functions independently of each other. In this layout, the large screen on the front of each decision maker or a group of decision makers is specially set up for it to display the information that is most concerned about. It is suitable for management and control institutions that focus on flat decentralized decision-making.
2. The layout of the projection display device
Projection display equipment includes projectors, controllers, source machines, information receiving and format conversion equipment. These equipment are large in number and volume, with close physical connections. The basic requirements of the layout are concealment, reliability, and easy operation and maintenance.
Projection is divided into front projection and rear projection. The front-projected light passes through the display hall and projects information onto the screen. Orthographic projection obtains a larger orthographic projection format by increasing the range of light rays, which is suitable for single-screen stand-alone occasions with larger screen size requirements, thereby reducing equipment and reducing costs. However, the height of the orthographic projection to the objects in the display hall There are restrictions, and the intensity of the light will attenuate with the extension of the projection distance, which reduces the brightness of the screen. The method of superimposing two projectors or reducing the brightness of the hall lighting is commonly used to increase the relative brightness of the projection display.
Rear projection is generally used in a short{{0}}range environment. In order to increase the size of the projection display, a wide-angle lens or a multi-projector splicing scheme can be used. The performance of the lens is usually expressed by the ratio of the range to the screen width, and the selection range can be from 0.88:1 to 7:1. The wide-angle lens only needs a short range to obtain a larger display format. However, compared with splicing with multiple projectors, in order to achieve the same brightness, a projector with a wide-angle lens is required to have a higher light source power, and the larger the screen, the more obvious the solar effect. Therefore, for a single screen with a larger screen, the splicing structure tends to be adopted. The splicing projector is fixed on a special rack behind the scenes, and the controller, source machine, information receiving and format conversion equipment are located at both ends of the scene or under the rack of the projector on the first floor, so as not to affect the normal projection display conditions To perform maintenance operations.
3. Display the equipment and layout of the control room
The display control room is usually located at the back of the display hall, separated from the hall by one-way glass, and there are sound holes on the glass, so that technical support personnel can directly observe and hear the personnel and equipment in the display hall, so as to find and respond to users in time Report, timely technical support and troubleshooting.
