In recent years, with the rapid development of the power system, a complete, advanced and useful grid dispatching automation system is required to ensure it. To meet the demands of an increasingly highly intelligent automated system for real-time data collection, processing, supervision and control. The automated power grid dispatching system generally includes the LCD splicing screen summary flashing system, which is responsible for the collective flashing of the main control system, the computer of the monitoring system, the network, and the video signal, which is used in the control of different planned power dispatching systems.
The display system makes full use of the ultra-high-resolution and ultra-high-contrast flash characteristics of the digital splicing wall, combined with the robust spatial processing of the GIS and GPS system, and accurately displays the operating status and real-time information of a variety of power equipment collected by the system. The visual display of functions such as equipment location, grid geographic distribution, information accounting, query, and graphics processing. The SCADA/EMS system, substation operation processing system, power material processing system, DTS system, dispatch production processing (DMIS) system, electricity billing system, GIS and GPS application and other related information can be flashed in partitions or on the entire screen. Analyze the operating status of the power system, assist dispatchers to understand and grasp the operating status of the power system, ensure the safety of grid operations, and provide a modern, intuitive and fast flashing method for scheduling selection plans.
In view of the special requirements for high reliability of the power dispatch system, professional projector manufacturers tend to apply the skills with high resolution and high reliability to the production of projectors that can perform daily operations.
In order to make the projector more suitable for rear-projection multi-screen splicing, splicing screen manufacturers often give special functions to this type of projector:
a. Color temperature adjustment function. That is, the projector can continuously adjust the color temperature of the picture, and even adjust the single color light of red, green, and blue. When a single screen flashes, this feature can be used to ensure that the projected picture and the monitor are completely together; when multiple projectors are flashed in splicing, it can ensure that the colors between the screens are accurately together.
b. Lamp power conversion function. That is, the lamp power of the projector can be adjusted. There are generally three methods: active brightness adjustment method, maximum brightness method and economic brightness method. Users can choose according to their needs. The active brightness adjustment method is the most important. In this method, the sensor in the projector will actively detect the output brightness of the projector, and adjust the power of the lamp through the closed-loop control system, and then ensure that the projector during the entire service life of the lamp Can maintain stable brightness output. This not only extends the service life of the bulb, reduces operating costs, but also ensures that the brightness of the screen and the screen is always uniform in the application of multi-screen splicing.
c. The characteristics of the light source are constantly improving, and the stability of its spectrum prevents the color of the picture from changing with the extension of the time of use.
d. Long-life lamp source planning, reducing operating costs. In addition to the brightness of the traveling projector lamp, the longest lamp life span has crossed 6000 hours.
e. In order to ensure the high reliability of the whole projector, the manufacturer ensures the high reliability of each component in the planning of the projector. Now, the MTBF of advanced projectors has crossed 40,000 hours. In the planning and production of projectors dedicated to multi-screen splicing and flashing, most manufacturers have put more emphasis on integrated rear-projection planning, which can save space and facilitate equipment. The depth of the integrated rear-projection DLP projector of about 127cm (50 inches) is only about 67cm, which is very suitable for places where the space is very severe.
In order to travel as far as possible the integrity of the picture on the entire projection screen wall and reduce the sense of splitting, the most advanced technology is to use seamless splicing, that is, each screen on the projection wall has no frame. From the front, adjacent screens are tight. Close together, the space is less than 1mm.
However, the use of seamless splicing technology often has strict requirements on ambient temperature and relative humidity to ensure that the screen will not be greatly deformed.
Regarding the selection of the screen, the first thing to do is to choose a high-gain wide-angle screen. The center gain of this screen is generally up to 3 to 5 times, and the horizontal viewing angle can reach 180 degrees. The clarity and color reproduction are good, and it is suitable for flashing high resolution. Computer graphics and video signals.
Because the gain of the high-gain wide-angle screen changes with the change of the viewing angle, this will cause the brightness of the picture to be uneven with each screen when viewed from the surrounding surface of the screen wall, resulting in uneven brightness and affecting the overall effect. But when the projector is not bright, it is the best choice to use this type of LCD to connect to the screen.
As the brightness of the projector continues to advance, the brightness gain of the screen will have less and less influence on the overall effect, and the hope that the entire screen wall from any point of view will be a uniform brightness picture is getting more and more intense. Therefore, in the future It has become a trend to use extremely high-brightness projectors and use no-brightness gain. High-definition diffuser screens with the same brightness from any point of view have become a trend.
The large-screen splicing control system is the brain of the entire large-screen splicing system, which directly controls the display content and flashing method on the projection display wall. In view of the special requirements for high reliability of the power dispatch system, when choosing a large-screen processor, you must choose a large-screen processing device that supports real-time RGB signal input.
All application windows are transmitted from the network to the splicing display control system, and after being processed by the splicing display system, they are displayed on the screen wall by means of multi-screen splicing.
The entire spliced flash wall provides a huge information flash surface. Assuming that the resolution of each screen is 1280×1024, a 2×6 spliced flash wall provides a resolution of 7680×2048, which is a 1280×1024 calculation. 12 times the amount of information flashed on the monitor.
All application windows can be moved and zoomed arbitrarily on the LCD splicing screen wall. Therefore, it is possible to expand a certain part of the grid diagram together with the display of the entire grid structure graphic, and it can also expand the real-time video monitoring picture of a certain substation, The electronic map of each area and even the weather conditions are flashed on the screen wall together, and local corrections on any part of the entire power grid can be reflected on the screen wall in time. Moreover, with the continuous advancement of the intelligentization of the power dispatch system, the advantages of the close connection between the large-screen projection splicing flash system and the computer network system will be more and more outstanding. As the skills of the entire system become more perfect, the cost is gradually reduced, and the large screen projection Splicing display system will eventually replace traditional analog screens
