Application of the hottest large screen projection

The application of large screen projection display system in power dispatching system

0, introduction

as one of the most modern video tools, large screen projection display system has been widely used in all fields of national economic production in our country. With the rapid development of highly intelligent power dispatching automation system, large screen projection display system has become an indispensable and important part of the system. It mainly includes projector system, screen wall system and multi screen splicing display control system

1. projector system

at present, there are mainly the following kinds of projectors in China to realize large screen projection display screen:

the first kind is the large screen projection display screen using cathode ray tube (CRT) technology. This projection technology is also the first large screen projection technology, which is widely used at present. The advantage is long service life (the service life of cathode ray tube is up to 20000 hours, but the disadvantage is low display brightness.

the second is the large screen projection display screen using transparent liquid crystal display (LCD) technology. This projection technology has been used for many years, and its technology and performance have become mature. At present, it has been widely used. It has high brightness, high resolution and good image quality

the third is the large screen projection display screen using all solid-state liquid crystal light valve (ILA) technology. This technology combines CRT ultra-high resolution technology and LCD high brightness technology, and has a good visual effect. With the decreasing investment cost and daily maintenance cost, its application scope is gradually expanding

the fourth is a large screen projection display using reflective liquid crystal display (DLV) technology. Using the principle of reflected light imaging, the pixel driving circuit is concentrated on the back. It is reported that the hole opening rate is more than 90%, and it has high brightness, high resolution and good image quality

the fifth is called DLP The projection display technology of (digital light processing) is being applied to the large screen projection display screen, which adopts the imaging principle of reflected light. At present, it is gradually improving the resolution and prolonging the service life of the light source. Due to the high light efficiency of DLP, it is a very promising display method. This projection technology has not been put on the market for a long time, and its performance is constantly improved and perfected.

in view of the special high reliability of the power dispatching system It is required that professional projector manufacturers tend to apply the technology with high resolution and high reliability to the manufacture of projectors that can work continuously every day

in order to make the projector more suitable for the multi screen splicing application of rear projection, manufacturers often give this kind of projector special functions:

A. color temperature adjustment function. That is, the projector can continuously adjust the color temperature of the image, and even adjust the single color light of red, green and blue. This feature can be used to ensure that the projected image is completely consistent with the monitor when it is displayed on a single screen; When multiple projectors are spliced for display, it can ensure the accurate and consistent color between screens

b. bulb power conversion function in 2014, Kunming Hengda Technology Co., Ltd. built the first semi-automatic production line of fence type aluminum base lead alloy composite anode plate at home and abroad in Jinning Industrial Park, Yunnan Province. That is, the lamp power of the projector can be adjusted. There are generally three modes: automatic brightness adjustment mode, maximum brightness mode and economic brightness mode. Users can choose according to their needs. The automatic brightness adjustment mode is the most important. In this mode, the sensor in the projector will automatically detect the output brightness of the projector and adjust the power of the bulb through the closed-loop control system, so as to ensure that the projector can maintain a constant brightness output during the whole service life of the bulb. This not only prolongs the service life of the bulb and reduces the operating cost, but also ensures that the brightness between screens is always uniform in multi screen splicing applications

c. the characteristics of the light source are constantly improving, and its spectral stability makes the image color not change with the extension of service time

d. the design of long-life lamp source reduces the operation cost. In addition to improving the brightness of projector lights, the longest service life of the light source has exceeded 8000 H

e. in order to ensure the high reliability of the projector, the manufacturer guarantees the high reliability of all components in the design of the projector. At present, the advanced loading handle should be placed at the unloading position after loading, and the mean time between failures (MTBF) of the shadow machine has exceeded 40000 H

in designing and manufacturing projectors dedicated to multi screen splicing display, most manufacturers advocate the integrated design of rear projection, which can save space and facilitate installation. The depth of the rear projection integrated DLP projector of about 127cm (50 inches) is only about 80cm, which is very suitable for places where space is very tight

the above several large screen projection display technologies have their own advantages. At present, CRT, LCD, DLV and DLP are all used as large screen projection displays for power dispatching. Generally speaking, the specific projection technology and equipment selected is not only related to the investment and display effect, but also related to the operating environment, operation and maintenance of the projection system

2. Screen wall system

in order to improve the consistency of the picture on the whole projection screen wall as much as possible and reduce the sense of fragmentation, the most advanced is the seamless splicing technology, that is, each screen on the projection wall has no frame. From the front, the adjacent screens are close together, and the gap is less than 1mm. However, the seamless splicing technology often has strict requirements on the ambient temperature and relative humidity to ensure that the screen will not be greatly deformed

for the selection of screen, at present, it is mainly to choose high gain and wide range, so that while reducing the shrinkage of modified materials, the angle screen can be angled. The center gain of this screen can generally reach 3-5 times, the horizontal angle of view can reach 180 °, and the clarity and color reduction are good, which is suitable for displaying 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 lead to the slave screen, so it can ensure the cleanness of the hydraulic oil; When viewed from the side of the curtain wall with chip receiving groove, the brightness of the image will fluctuate with each screen, resulting in uneven brightness and affecting the overall effect. But when the projector is not bright enough, using this kind of screen is the best choice

with the continuous improvement of projector brightness, the impact of screen brightness gain on the overall effect will become more and more insignificant, and the expectation that the whole screen wall will be a picture with uniform brightness from any angle is becoming stronger and stronger. Therefore, in the future, it will become a trend to use projectors with extremely high brightness and high-definition diffuse screens with no brightness gain and consistent brightness from any angle

3. multi screen splicing display control system

the multi screen splicing display control system is the brain of the whole large screen projection display system, which directly controls the projection