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Bank door first monochrome display, (service hotline: 02985453602) Bank indoor table display in government offices scheduling table display, LED display VS DLP splicing screen both advantages and disadvantages Analysis (From China LED Display Network) television programs more colorful, interactive is growing, to the audience's visual impact is also growing, in which the program has played an important role in the background. In recent years, LED display and DLP mosaic screen gradually become the mainstream program background paper on the technical characteristics of these two display, use effects, disadvantages and precautions to do some analysis and discussion. A, LED display LED is LightEmittingDiode abbreviation, the Chinese meaning is a light emitting diode, is a solid state semiconductor devices, which can directly convert electrical energy into light energy. LED display is an advanced digital information product that the successful integration of computer technology, network communications technology, image processing technology, embedded control technology, with flexible display size and resolution (Modular any assembly), high brightness, low power consumption, long life, low heat, environmental durability and other advantages, the integrated use of sound, light, electricity, graphics, text, all-round, a perfect demonstration of the end product information. LED display at major events in the television studio and television increasingly being used as a stage backdrop, it offers a variety of vivid, dazzling background picture and more interactive features that allow the background screen also move also static that blend performance and background, people immersive feel. It brings more space for reverie choreography, modern design and visual impact of the stage, perfect atmosphere to live together and programs to achieve the other stage art equipment function and effect is difficult to achieve. The audience on the LED display viewing and feel is very intuitive, as long as the screen size and pixel spacing and viewing distance appropriate, this direct-view display can get excellent results. However, the number of the TV audience is much larger than the number of the audience, so the TV viewing audience is the focus of television technology workers in research and discussion. Many tables use the LED display, but out of the TV screen effect is very different, and some colorful pictures throughout, clear and stable; some vision screen when underestimate unclear, either when the close-range highlights some of the activities, either erratic interference fringes, in some close-up shots, often appear moire disrupt the audience's attention. In the selection and use of LED display should pay attention to the following aspects: 1. point spacing as small as possible dot pitch is the distance between the centers of pixels adjacent LED display. The smaller the dot pitch, the more pixels per unit area, the higher the resolution, the closer shooting distance can, of course, its price is also more expensive. Currently dot pitch LED display domestic television studio used mostly 6-8 mm, in order to achieve excellent results, to seriously study the relationship between resolution and dot pitch between the signal source, and strive to achieve consensus resolution, It reached the point display, in order to achieve optimal results. 2. LED display higher fill factor fill factor (FillFactor), also known as the proportion of bright areas, namely, the light-emitting area of ??each pixel of the physical surface area occupied by the pixel. LED display is composed of discrete pixels arranged made obvious dark area between the pixel does not emit light. When viewed up close, the picture does not coherent incomplete and uneven brightness to produce grainy, if confined to a small light source pixel surface area, resulting in a single pixel brightness of the entire screen brightness and even multiple of ten times, it will cause more serious sense glaring. TCO'99 flat panel display industry recognized standards, the fill factor should not be less than 50%, currently on the market a lot of filling factor LED display does not reach the target. TV cutoff low-pass filter characteristic has a direct impact on the right to shoot the fill factor different from the LED display. The same dot pitch LED display, the fill factor is smaller than the fill factor large attenuation to be more, so the need for greater shooting distance. If the system low-pass filter passband of 4MHz, high frequency attenuation characteristics of 12db / octave, then the fill factor of 25% of the shooting distance is more than the fill factor of 50% attenuation of 1.15db, shooting from the need to increase about 10% . Improve fill factor, making the display more broad perspective, blending effect is more ideal, to overcome the problem of glare pixels, but also for an appropriate increase in the brightness of the entire screen to obtain better results and create the conditions. Jiangsu Education TV Station selected a fill factor of 60% of the LED display, which has a moderate soft brightness, uniform bright color, crisp and clear expression, guarantee the high quality of the display screen. 3. Color can adjust the color temperature (ColorTemperature) is emitted by the emission spectral shape and the best fit blackbody emission spectrum shape is determined by the temperature. When using the LED display as the studio background, the color temperature should be the same color temperature and lighting in the studio, to get accurate color reproduction in the shooting. Studio lights according to program needs, sometimes using a low color temperature 3200K lighting, sometimes using a high color temperature 5600K lighting, LED display to the appropriate color temperature adjustment is required to obtain the desired result. The shooting distance to the right as previously talked about dot pitch and fill factor mentioned, different spacing, LED different fill factor of the display, the appropriate shooting distance is not the same. From the camera at a person and the screen between 4-10 meters more appropriate, you can get a relatively good background picture when this shooting people. If the character off-screen too, in the close-range shooting, the background will appear grainy, but also prone to moire. 5. ensure good use of the environment during the life of the product only under favorable conditions of work, the failure rate was low. LED display as the integration of electronic products, which is mainly composed of a control panel equipped with electronic components, switching power supply, light-emitting device, etc., and all life and stability of these components are closely related with the operating temperature. If the actual temperature exceeds the specified range of products, not only will shorten its life, the product itself will be seriously damaged. In addition, the threat of dust can not be ignored. Working in dusty larger environment, the PCB attract dust, and the deposition of dust will affect the heat of electronic components, will result in component temperatures rise, and then fall as heat stability and even leakage, can cause severe burning. Dust will absorb moisture, thereby corrode electronic circuits, causing some short circuit problem is not easy troubleshooting. To keep clean the studio. Studio transformation will generate a lot of dust, in advance of the LED display do protection work. Use LED display greatly enriched the show form the background of the program, LED display as the background for the big scene, large-scale variety show big studio. Two, DLP DLP mosaic screen is DigitalLightProcessing acronym, the Chinese meaning of digital light processing, this technology is the first video signal through digital processing, and then the light is projected. From the principle of DLP technology, it has the least amount of signal noise, precise gray level, higher reflectivity, seamless image display, high reliability advantages. DLP splicing screen by a plurality of projection display units splicing, its main feature is the patchwork of small, can be controlled to within 0.5 mm, we call it "seamless" stitching, which is also the other two technologies LCD and PDP I can not reach. Because it's these advantages, in recent years, popular television using DLP mosaic screen as a studio background, CNN, BBC, SKY, CCTV and other well-known large TV in use have made a very good show results. DLP splicing screen and disadvantages. Since the DLP light source spliced ??from the bulb, causing its large power consumption, high heat dissipation, and after a period of time will reduce the brightness, the user must continue to replace the lamp to maintain the initial display. With the development of technology, thanks to the LED light source is added, the current DLP mosaic screen has been resolved frequent replacement of light bulbs, power consumption, heat dissipation of a series of problems. Uses LED light source DLP splicing screen after, not only in the life and power has been a major breakthrough, the color has also been revolutionized, so DLP mosaic screen maintained a market-leading advantage. In order to achieve satisfactory television effect, we in the selection and use of DLP mosaic screen should pay attention to the following aspects: 1. splicing gap as small as possible the effect we want on the TV screen background is seamless This requires splicing gap is small enough to not see the gap from the lens. Currently, the use of titanium-needle stitching technology allows splicing gap narrowed to less than 0.2 mm, through the connecting plate designed to ensure that the screen does not distort when thermal expansion and contraction, providing a high-quality image geometry and sharpness of the screen. 2. uniformity higher DLP mosaic screen formed by combining multiple displays together, thus causing the individual differences of each screen, and we want them to look like a piece of matching color and brightness with a large screen, which the need to improve the uniformity through technical means. Currently this technology is relatively mature, advanced technology manufacturers have been able to do a background run silently, without operator intervention, by integrating proprietary brightness and color sensor, continuous measurement of color and brightness of the screen wall and between the projection module communication, automatically match all white, all gray levels of brightness and full color display module and two all-black, and maintained throughout the same gray level display, enabling multi-screen image of the long-term consistency. 3. The need to adjust the color temperature and LED display, like, DLP mosaic screen color temperature required to maintain consistent color temperature of lighting in the studio, in order to ensure a true color image reproduction. The studio lights to control the DLP mosaic screen compared to other display, the brightness is relatively low, which requires good control of studio lights, avoid direct light on the screen. After study we explore the use of cold light lamps with 20 ° grille, effectively coating onto the screen illumination control in less than 100lux, but also to ensure the host side illumination light can reach 800-1000lux, obtained satisfactory effect. 5. light the need for high security televised interactive increasingly strong background security requirements have become more sophisticated, DLP mosaic screen single screen body dimensions are larger, there is a problem if the light source, resulting in a black screen, the negative impact on the program as well as a station will be great. We need to use dual-lamp with redundant hot backup or LED module as a light source. 6. ensure proper cooling, but also control the noise UHP lamp and LED light source at work will have a huge amount of heat, it's the heat source is an important part of life and ensure the normal operation of advanced liquid cooling technology enables the cooling efficiency higher, less noise, but also pay attention to maintaining good environmental temperature at shutdown can not immediately cut off the power, let the cooling system to continue running for some time, the light source is sufficiently cool before cutting off the power supply, which play a good source protective effect, to have the best performance when making job. DLP splicing screen studio background is a major change, but due to its high lighting requirements, not suitable for use in large-scale variety show, suitable for news, interviews in small and medium sized studio, field wiring and weather types of programs. As technology advances, there will be more new technologies and new approaches to be applied to studio background. We want to understand their characteristics, for different studio conditions and requirements to select the program in the form of technology products as a background, let these new technologies to maximize its advantages, and better for the program services, spectator services. More LED related information, please click on concern China LED network or micro-channel public accounts (cnledw2013). This paper from China LED Display Network Website: http: //led-display.cnledw.com/tech/newsDetail- wantonly three one zero Nine .html