The large screen splicing video display wall is a large screen display system composed of a plurality of display units and video processors, and is generally used for a large screen display of one screen and a multi-window display of multiple screens. Therefore, the input video signals are all processed by the video processors and distributed to each display unit, and each display screen can span the boundary of the display unit.
There are 4 kinds of most popular splicing screen: LED, LCD, DLP and PDP.
LED display splicing screen
LED display is a display that directly uses LEDs which is the abbreviation of "Light-Emitting Diodes" as pixel light-emitting elements that form modules directly emit light of three colors of red, green and blue, thereby forming a color image.
LED display adopts large-scale integrated circuits, which greatly improves the reliability and facilitates debugging and maintenance. All-weather work is fully adapted to various harsh outdoor environments, waterproof, moisture-proof, anti-corrosion, lightning protection, strong overall performance of earthquake resistance, strong luminous brightness, and the display content is clearly visible when the sun is directly on the surface of the screen within the visible distance, and cost-effective.
LED display has slim structure, light weight, but stable. It can be customized into any shape such as sphere, cylinder, circle, triangle, etc. It can be used for indoor and outdoor. It is easy to install. It is easy to maintain. It leaves no gap between each panels. It has long life span. It has shortest response time. But It is expensive in close viewing distance and small pixel pitch such as P1, P1.25 etc.
LCD splicing screen
LCD is the abbreviation of “Liquid Crystal Display”. The structure of LCD is to place liquid crystals in two parallel pieces of glass. There are many small vertical and horizontal wires between the two pieces of glass. The rod-shaped crystal molecules can be controlled to change the direction by powering on or off, and refract the light to produce the image.
LCD splicing screen has low power consumption, light weight, and long life (normally work for 50,000 hours), Non-radiation, high definition, high brightness, high color saturation, high contrast, high resolution and a series of high-quality display advantages, which are highly praised and respected by the large-screen market, and are widely used in security, advertising media, Entertainment and culture, command centers, coal mines and many other industries. But its biggest shortcoming is that it cannot be seamlessly spliced, which is a bit of a pity for industry users with very fine display screen requirements.
At present, LCD splicing screens can be spliced arbitrarily according to customer needs, up to 10X10 splicing. And secondly, LCD splicing screens use LED backlight to emit light, with a life span of up to 50,000 hours. The life of the backlight source is ten times that of the rear projection bulb compared to DLP and PDP. In addition to the high definition, high brightness, high color saturation, high contrast, and high resolution of LCD splicing, the life of the LCD is very long. Moreover, the power consumption is low, the heat generation is small, the failure rate is very low, the performance is stable to support 7×24 hours of uninterrupted work, and the subsequent maintenance cost is low.
DLP splicing screen
DLP is the abbreviation of "Digital Light Procession" which means that this technology must first process the image signal digitally, and then project the image with light. It is based on DMD (Digital Micro-Mirror Device) to complete the visual digital information display technology. The cold light emitted by the UHP bulb passes through the condensing lens, homogenizes the light by Rod. And the processed light passes through a color wheel to divide the light into RGB three colors (or more colors such as RGBW), and then divided colors lights project on the DMD chip through lens, and finally reflected through the projection lens to form an image on the projection screen.
The DLP splicing screen is formed by splicing multiple rear projection display panels. Its main feature is the large screen size and small gaps. Although there will be gaps between the display panels, the physical splicing gaps between the panels can be within 0.5mm. However, the DLP splicing screen still has some fatal shortcomings. Because the DLP display uses multiple display panels to splice, the color and brightness will be uneven when the number of splicing screen is reached, and the power consumption is high, and the internal luminous bulb is continuously working after 6000-8000 hours, the brightness will decrease. In order to maintain a better display effect, the light bulb needs to be replaced, so the maintenance cost is very large. In addition, due to the large thickness of the DLP splicing panel, it is necessary to leave enough space on the back, which is also a problem for some environments with relatively small space.
However, with the continuous development of splicing technology, the current DLP splicing panel adopts LED light source, which not only has a major breakthrough in the service life, but also has revolutionary changes in color and power consumption.
PDP splicing screen
PDP is the abbreviation of “Plasma Display Panel”, its working principle is very similar to fluorescent lamp. At present, there are three types of color PDP researched and developed: single substrate type (also known as surface discharge type) AC PDP, double substrate type (also known as counter discharge type) Formula) AC PDP and pulse storage DC PDP. From the perspective of technical principles, since the luminous plasma tubes in the PDP screen are evenly distributed in the plane, the center and the edges of the displayed image are exactly the same without distortion, and a pure plane in the true sense is realized. Since there is no electron beam movement during the display process, no electromagnetic field is needed, so the external electromagnetic field will not interfere with it, and it has good environmental adaptability.
Since the PDP does not require a background light source for light emission, there is no LCD display viewing angle and brightness uniformity problem, and higher brightness and contrast ratio are achieved. The design of the three primary colors sharing the same plasma tube also avoids focusing and convergence problems and can achieve very clear images. Compared with LCD display technology, the larger the screen of the PDP, the higher the depth and fidelity of the image. In addition to the advantages of brightness, contrast, and viewing angle, PDP technology also avoids the response time problems in LCD technology, and these characteristics are the most important factors in dynamic video display. PDP monitors have no scan line scanning, which is completely pixel-to-pixel, so the image is clear and stable without flicker, and will not cause eye fatigue. PDP is also free of X-ray radiation. Because of these two characteristics, PDP can be called a truly green display product.
However, PDP screen products have large pixel gaps, lower reliability performance than other products, higher power consumption, and congenital shortcomings of life. After 5000-7000 hours of use, the screen brightness will decay by half, and it is difficult to operate at an altitude of 2500 meters or more. Its most fatal weakness is that it is easy to burn when displaying computer images or static images for a long time (the so-called burning phenomenon refers to the change of plasma inside the screen when the plasma TV is in a static state for a long time, causing it to fail to work normally. It appears that there will be residual image of the image at a specific position on the screen, and it cannot be removed regardless of changing any source).
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